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@fotoferry Күн бұрын
Hi, the failing clock doubling is really unsatisfiing. I was upgrading a Toshiba T3100SX luggable (386SX-16) with a TI486SXLC2-G50 and also have problems with this feature. The strange behaviour you had with input clk about 25Mhz might be because for clock doubling the input clock has to be 32 to 50 MHz! The datasheet mentions a "valid PLL lock range". On the other hand i can not belive, that enabling the clock doubling should have anything to do with any chipset, especially not because of to high clock, because the doubled clock is only inside the CPU while chipset is still at half the oscillator clock. My modified T3100SX works fine with 50MHz oscillator in non clock doubled mode, so it seems the mainboard is fine with 25MHz. When i switch to clock doubled mode it freezes after a few seconds. I was able to run a cpu benchmark a few times and saw the difference this feature made, but it always freezes. 😞 THX though for your Video. 🙂
@atheatos Күн бұрын
For the PLL this is what I also think, however it is a bit strange because the window is very small around 25Mhz. Maybe there is bus timing issue? The second point it is still a mystery. I also agree with your point that this is internal. Other people tried with my motherboard too and failed, while on others with a newer revision of the chipset, it worked. Until I make more tests with other M/Bs or maybe changing the chipset there we do not know. The max 40MHz I had is probably a limit of the chipset too.
@fotoferry Күн бұрын
@@atheatos You mean 40MHz without clock doubling?
@atheatos Күн бұрын
Yeah here the max bus was 40MHz, 50MHz only possible with hot plug and the 386sx. There is something for sure limiting this M/B. As said, I need to test more, with other M/Bs too.
@ORION7865 13 күн бұрын
the voice of Kimi Raikkonen😉
@retrotomat Ай бұрын
Thank you for the great video 😊 I was wondering how you managed to achieve 44 MHz FSB. Is it related to the little white interposer with the crystal next to the motherboard chipset?
@atheatos Ай бұрын
No, this motherboard modded with my Any_Clk device. you can see how I did the mod in this video: "Custom clock generator for Retro systems "Any_Clk". A new era of Retro Overclocking?"
@retrotomat Ай бұрын
@@atheatosGreat! I’m looking forward to watch it 😊
@Pulverrostmannen 2 ай бұрын
I been overclocking every computer possible since the 90s, I love the extra free performance hiding inside my stuff :)
@atheatos 2 ай бұрын
Same here. Unfortunately, overclocking is a bit dead these days. CPU come now OC from factory.
@Pulverrostmannen 2 ай бұрын
@@atheatos there is still overclocking capabilities in more modern chips. My last gaming computer has a 6700K cpu which I overclocked to 4,8Ghz with all cores loaded and generally it won’t turbo when all cores are loaded reducing performance. This specific cpu outperformed a 7700K with the OC I made. Now I have the Ryzen 7 5800X I have made it able to turbo up to 5GHZ which is a substantial performance increase too. However it’s not as straight forward to OC today VS older stuff
@scottmm78 2 ай бұрын
Sadly all my 386 mbs have 2 or 3 2pin jumpers for 50,66,80 clk And my 486's have about a dozen jumpers
@atheatos 2 ай бұрын
Sure, many M/Bs have jumpers for bus clk, however this is just not enough for serious over/underclocking. Unusually 386 M/B are limited to few settings between 20-40MHz bus (with 40-80 setting). 486 something like 25-50Mhz. With this any clock is possible is the range 8-200MHz, as 2pin crystals are very inexpensive and come in many values. I actually also offer an optimized pack of 20 extra crystals. With this to generate any frequency using the Any_Clk devices with a step <1Mhz. Check also my other over/underclocking videos where I make full use of this. migronelectronics.bigcartel.com/product/full-packet-of-extra-crystals-21-pcs-21-values-for-any_clk-devices-add-on-item
@StillTheVoid 3 ай бұрын
I have a GCT-8IV motherboard and the retro web has some good info regarding my socket 7 i want to build. The Awards BIOS Chip looks like it can be replaced but im not sure if THIS tool allows me the alternative to upgrade the bios version. Do you have advice on what I should do? 🤷♂🤷♂
@atheatos 3 ай бұрын
I am not really sure on what is your problem there. To update your bios you need a flash program (award flash, to do it while the PC runs), or a programmer (to do it offline by removing and reprogramming the chip). The video and the tools here are about modding the bios files to add modify some options, not related to programming or updating the bios. Latest bios probably available retro web, but first check that version you have.
@StillTheVoid 3 ай бұрын
@@atheatos its the very first family computer so i doubt it was never done. Could this bios modding tool assist in updating to its 1997 release according to rw? Or do you think awardFlash is enough without needing this modding tool?
@atheatos 3 ай бұрын
Moding tools are not for flashing. As said, these are used to edit bios files (add maybe options) before flashing. AwardFalsh is enough for update, but again check first what version you have. The date is stated on boot.
@StillTheVoid 3 ай бұрын
@@atheatos Thank you so much for the clarification. I needed this advice for quite some time as i had to put my socket 7 project on hold because of this. 😅
@Raul_Gajadhar 4 ай бұрын
Side Note! Has anyone ever watch this particular video with [CC] On? I am sorry but I just can't help laughing hard! I have to watch with [CC] because of 'Sudden Loss Of Hearing' back in 2016 in my left ear. Trust me watch this with Closed Caption On, You will not regret it!
@TerroMin 4 ай бұрын
Cyrix don't have L1 cache? How about CPU with clock doubler?
@atheatos 4 ай бұрын
The Cyrix 486DLC has 1KB of Cache. It is just that some tools do not detect this small amount of cache. But the cache is there and has a significant difference when you have it enabled. It is the same with 1KB cache clock double CPUs. 8KB ones are detected by the tools.
@LeeMc007 4 ай бұрын
The underclocking was really quite funny, really interesting video, I know its years later but thanks for the content. I'll binge watch the rest of your videos. 👍
@e8root 5 ай бұрын
Unreal bandwidth of 3MB/s... >10fps in Doom... Quake runs... damn, I wish I had this 386DX55 instead of 386SX25 back in the day. I wanted 486DX66 though
@KeinNiemand 6 ай бұрын
Can those old chips overclock further if you give them enough voltage and cool them with liquid nitrogen and do full blown extreme overclocking?
@atheatos 6 ай бұрын
I have no ability to do LN2. I had tried with a Peltier and had no real effect there. Also it looks like 55MHz is not only the limit for the CPU but for other parts of the system. I think in general voltage is more important there. The maximum I tried was 5.4v, 5.5v. It could be that even 6v is safe but in general I do not want to risk it as this goes to all the components not only the CPU.
@Darkcrafter07 6 ай бұрын
You should try FastDoom and especially fdoom13h and fdoomh exes, your fps will double.
@atheatos 6 ай бұрын
The thing is, If I want to play Doom I for sure do not do this on my 386. And then with normal doom is better / easier for others to compare with my results. However, all this is interesting so I will try it at some point.
@vicokoby 6 ай бұрын
Using AMIBCP can you make an AMI bios automatically recognize disks larger than 32GB?
@atheatos 6 ай бұрын
This is not possible with AMIBCP. You need a tool called "Bios Patcher" (rom.by).
@vicokoby 6 ай бұрын
@@atheatos I think Bios Patcher works for Award bios, not AMI
@atheatos 6 ай бұрын
You are right. I confused AMIBCP and MODBIN. Either way... I do not think AMIBCP can do it and I do not know something to patch AMI Bios for this.
@alfredklek 6 ай бұрын
I bought this board new and still have it.
@joseluisgoba 7 ай бұрын
I´ve got both 512KB, 1MB cache testing with 256MB RAM that's right but everything changes when you use 512MB with windows 7. The 512KB cache one is a little faster with Sisoft Sandra Lite 2007.SP1 Memory-Cache test Combined Index 707MB/s vs 633MB/s in 1MB one. 3DMark2001 2126 for 512KB vs 1992 for 1MB. When you use 768MB RAM the 512KB cache version improves a little with Memory-Cache Test with 711MB/s and 3DMark 2133 but the 1MB cache gets worse from 512MB to 768MB with Memory-Cache test Combined Index with 468MB/s and 3DMark 1900. I did the test with the same BIOS version and configuration also the same hardware. It seems as the cache range in 1MB version is about 256MB instead 4GB. I doubt both internal and external work at the same time, maybe ASUS put the additional external TAG because the internal doesn't work with 1MB cache as same as the versions 1.03, 104. You test that, please also try to find a program which shows both TAG RAM work at the same time. The version 512KB with 10 bits TAG RAM is the cacheable range 512MB. Version 1MB with internal TAG RAM (512MB) x 8 bits of the external = 4GB cacheable range but if only works the external one 256k x 8 bits with 1MB cache, cacheable range would be 256MB. Both 512KB and 1MB cache version work very well with Windows 7 and 512MB or 768MB of RAM even they can handle a Geforce 7600GS 512MB DDR2, that's the graphics card used for the testing. I didn't modify the motherboard for using K6-III+ so the processor is a AMD K6-III/475 working at 450MHz and the original 2.2V but the BUS is 112MHZ (112MHZx4). it works completely stable.
@atheatos 7 ай бұрын
I think I also remember that there was performance hit when with more that 256MB of ram. Now normally with a system like that, 256MB of ram is already more than enough (most people will use it with win win98, max winXP). So I just used 256MB and did my job. Unfortunately I never investigated in depth the cacheability topic. I might check in the future. For the tags... this has nothing to do with Asus. According to the chipset datasheet 1MB cache is only possible with the external tag installed. Now excluding all the mods with 10bit external tag as this means 2 external tag chips that nearly no M/B has, there are two options: 1) Only external tag 8bit that limits cacheability to 128MB to all cache sizes. 2) Both tags enabled that should be 4GB for 1MB cache. Combined tag is 12bit. As 128MB vs 256MB, I did not notice any performance difference, the M/B is probably in the 2) case. Also looking at the WPCRs. register 40 (val 53) and 41 (val 08), both tags are marked as enabled on the 1MB board. So either the 4GB cacheability claim is not actually true or there is some other reason that cuts performance above 256MB of ram. I need to check more, last time I worked on this board was 2 years ago. This is just what I remember.
@joseluisgoba 6 ай бұрын
@@atheatos thank you. I don't believe 4GB cacheability claim is actually true in the 1MB cache type as there's a performance hit when with more that 256MB of ram. In the other hand the 512kb cache one improves performance with 512MB even 768MB ram. I've ever seen some programs which can detect the cacheable range, I don't know if that's true. I'll be happy if you investigate about that.
@atheatos 6 ай бұрын
There is the cache check tool in DOS. It is true, but the more Ram you have the longer it takes to run. It will take a few hours probably with 512MB :/ I will only know more if I do tests again with this M/B. But in the end 256MB is fine for me.
@joseluisgoba 6 ай бұрын
@@atheatos It would be great, if you compared the 1MB cache with 512KB one with 512MB Ram. I´ve already done it, it seems to be about 12% faster the 512KB cache version than the 1MB one doing Sifsoft Sandra 2007 SP1 Memory - Cache test and 7% faster the 512KB cache version doing 3Dmark2001 test. I would be very grateful with you if you do the double check about that. Best wishes.
@atheatos 6 ай бұрын
I will include a section about cacheability on my next video about this board.
@AG-jj3lx 7 ай бұрын
Thank you for your tests. I had a MM 166 overclocked to 233 on my SS7 board. Good times :)
@marsupialpianist1450 7 ай бұрын
IBM BL3 at 2x55 would be very interesting. Hard to find, however. QPF132 from some IBM Model 80 planar I think, unsure? Also, It's possible Paradise VGA XLR WD90C31 from 1993/4 will work fine at 18.33mhz in ISA.
@atheatos 7 ай бұрын
Yeah there is still some room for improvement there. One or the other way I have now the 486SXL (cyrix 2x40, 8KB cache). I also have many VGAs that are probably faster like the WD90C31 (I just had some incompatibility problems there). IBM BL is a different story all together. It is undocumented and to my understanding not 100% compatible with these M/B. However I have a motherboard with it so I can maybe run some benches and compare.
@pointblank722 7 ай бұрын
Do bios have to identify the Cyrix cpu for the operation?
@atheatos 7 ай бұрын
No, these are are drop-in replacements for 386DX. However enabling the cache without problems depends on the M/B circuits. And a bios that is aware of CPUs like that could save you from having to use the Cyrix tool.
@mikeb3172 7 ай бұрын
There must have been a mix up in the factory about part numbers. I guarantee clock doubling works at 5v... they are 5v tolerant...
@atheatos 7 ай бұрын
The CPU is fine. For sure it supports clock doubling. The problem most likely here is an incompatibility of this clock doubling feature with the motherboard (with the M/B chipset or the bios). Others tried on the same M/B failed the same way, while this works on other M/Bs.
@MarkusQu 7 ай бұрын
Interesting. Never see SIMM with just one chip on.
@marsupialpianist1450 7 ай бұрын
If we take the back off this package can the clock multiplier be further changed? one clock pin is exposed to fan status and the other might be on the internal wafer package but is NC
@atheatos 7 ай бұрын
Very hard to tell, very hard to reverse to this level. I do not have equipment to try something like this :/ My guess is that this is not possible. The PLL there is probably fixed at 2.5x. Then this is just a safety thing that disables the PLL and so it is clocked directly from the input 1x.
@pointblank722 7 ай бұрын
I have the same 386DX-25 with same serials with yours and overclocking to 40Mhz without any issues, giving exact same results with AMD 386DX-40 at NSSI, Landmank and sysinfo.
@marsupialpianist1450 8 ай бұрын
If fsb is 25 clock doubling should work but if higher cpu might force 1x. Maybe I forget and one version wanted to see 20fsb
@esc2dos 8 ай бұрын
I have a 367C board without a Bios chip. I removed the Bios chip from another 367C that I have and I discovered it is an EEProm (no UV window). The only numbers on the chip are 0ABB039/11-5121511/(Triangle icon)345C3BAD0A , I have searched the internet and I can find no info on this Bios Chip. Do you know what this chip could be and what I could use as a replacement?
@atheatos 8 ай бұрын
This is a 64KB Bios. More or less all motherboards like that use a 27C512 Chip. Brand, window or not does not matter.
@esc2dos 8 ай бұрын
@@atheatos That's exactly what I tried, I programmed an M27C512, used both of the Roms at Retro Web but neither worked, the post card just shows 4 dashes. Popped the Good chip in and it posted. None of the Chip types I tried with the TL866 can read the good Bios chip ( I was hoping to dump the Bios). I rewatched your video about Bios Modding and I'm wondering if this good bios chip is a 'one time programmable' perhaps that's why it's impossible to find online. The M27C512 I'm using is from a parts board (I've never seen it actually functioning in a running machine) so I'm going to try programming it for another machine and see if it will work in that, if not I'll try another 27C512. Really appreciate your reply Good Sir. I'll be sure to credit your assistance in my next video concerning this. Thank you
@atheatos 8 ай бұрын
If you program and verify your chip with your programmer, it should be fine. So my guess is that the roms you downloaded are just incompatible with your board. Unfortunately many OEM of this era used custom ordered one time programable chips with custom prints for their motherboards. So it is impossible to tell the real model / brand of these chips. However for sure these are one of the many 27c512 listed in Xgpro tool. Just try all of this and try read your chip. If you get an invalid ID massage you can still use the option to ignore the ID and try read it. Or You can see the ID and go online and check it. There is a site "EPROM Device ID List" with a bit list of IDs and eeprom models. Then an other approach is maybe to use some dos utility to dump your bios into a file. Search for "dosdays BIOS Utilities".
@esc2dos 8 ай бұрын
@@atheatos Fantastic, I will try all the above until I get that rom dumped and transferred. I read on a forum there is a potential to damage the Bios chip by reading it with the wrong Chip selected, but you see a lot of half-baked opinions regarding these things. So far after trying 6 or more types my chip is still functioning. You think there is any truth to the programmer damaging a Bios chip with a Read?
@esc2dos 8 ай бұрын
As you predicted, Yes indeed my M27C512 Chip is fully functional in my Fortiva 5000 machine. On to the next step. Thanks again.
@marsupialpianist1450 8 ай бұрын
RevTo486.exe might be able to enable clock doubling for the 50?
@peterweber79 8 ай бұрын
last week i pulled a dirty dumpster PC - happens every few years - and i had a Asus P5A v1.06 installed, lucky find :D
@atheatos 8 ай бұрын
Nice :)
@eliubfj 9 ай бұрын
Thank you, random yet interesting!
@tofuguru941 9 ай бұрын
@ 1:14 In offset 41 for the 1mb cache motherboard... you say to change that value from 08 to 48 if the cache is disabled for a performance boost. What about for the 512k cache motherboard version? For offset 41, the default value isn't 08, but instead its 05. Do we change it to 45? I also have a Gigabyte GA 5AX Rev 5.2. Will these tweaks from your part 1 video and this one work the same on the GA5AX or is everything different? Thanks!
@atheatos 9 ай бұрын
True, this (offset 41) should be changed from 0... to 4... This sets the 6th bit, and enables "Fast DRAM Read". This increases performance, but is only stable when the M/B cache is disabled. The model or cache size does not matter, as long as it is the same chipset. That is for all these opts. Happy tuning ^^.
@tofuguru941 9 ай бұрын
@@atheatos Thank you! Those Ali AGP 1.9 drivers made my 3d Mark 99 score go up 1000 points! Almost 4000 total now. 😁 I also did a couple of those tweaks from wpcredit which helped mem bandwidth & latency quite nicely 👌 I haven't done any of the command line stuff in my autoexec yet. Finally got over 2000 in 3d mark 2000 👍 Currently running a gigabyte ga 5ax rev 5.2 with a K6III+ @ 600 ([email protected]) And a voodoo 3500. I have a p5a 512kb 1.06 as well sitting in storage. Going to do the 1k ohm mod on it and tinker to see how it compares to my ga-5ax next week. Question: I have the following agp gpus available... Which would be fastest in the ali chipset with these two boards I have... And which would you run: Riva TNT2 Ultra GeForce 2 MX400 GeForce 3 Ti500 Radeon 9700 Pro Or keep the voodoo3 3500?
@atheatos 9 ай бұрын
Nice results there :) Fastest overall and best option is the "GeForce 3 Ti500" combined with some old driver (7.76??). Especially this is true in benchmarks. Big difference from the Voodoo. Now some games with the Glide API might run faster on the Voodoo, so hard to tell. Personally I do not have stable configurations and PC cases/ full pcs etc. So normally I would had just tested all for fun, make maybe and video then put away.
@---cx9hd 9 ай бұрын
The limitation you were running into was that of the chipset. The RC2016A4 is limited to 40 MHz operation. It can accept up to 43 MHz apparently, but it will not allow for 50 MHz operation. That explains why you needed to hot plug the original 386 CPU to get past 43 MHz.
@atheatos 9 ай бұрын
Probably true. The clock doubler not working is probably the same thing too. I have a few M/Bs with the RC2016A5 chipset now. I might try there too. I have also some RC2016A5 chips I might try swapping chips.
@---cx9hd 10 ай бұрын
Any chance you can put up a link to the Cyrix software you used to control the processors you demonstrated? I have a TI 486SXLC and I haven't been able to find the proper software for controlling it's various functions.
@atheatos 10 ай бұрын
I added a link to a Vogons thread with what you are looking for. I might make a packet with everything for these Cyrix CPUs in the future. I just do not have these files not on my windows machine right now.
@vladimirrodionov5391 10 ай бұрын
I don't believe Cyrix/TI/IBM "486"s have real 486 cores. They all licensed 386 from Intel and upgraded them with microprogrammed 486 isa and added cache. IBM I think manufactured them at lower nm which allowed them to boost the clock to 66 ands then 100mhz.
@atheatos 10 ай бұрын
Cyrix / TI ones did not license from Intel, but to my understanding these are their own 486 core just for 386 socket (they never had a 386). IBM is always confused with these but it is actually totally different. They licensed the 486 core directly from Intel. The pin out is mostly compatible with 386sx, but not 100% as there are extra pins regarding the cache (unfortunately undocumented). So unless the datasheet is found... or someone reverses a M/B with an IBM chip... modding one into a 386sx M/B with caches working is impossible.
@Stoned_Raiders 11 ай бұрын
Just watched your video on modding the 386SX to 486, and I'm seriously blown away by the quality of your content and explanations! Your work is fantastic, and I'm itching to try it on my own 386SX 40 MHz. Thanks a ton for the top-notch content and insights. Truly impressive!
@atheatos 11 ай бұрын
Thank you for the comment :) More videos to come at some point soon.
@daniellisy7161 11 ай бұрын
Anyone knows what came out of the project?
@atheatos 11 ай бұрын
Unfortunately, not much has changed here. I just too busy with my day job and other simpler projects right now. I also want to improve this further. This will take some time so please be patience. Check also my second video on this.
@alexloktionoff6833 11 ай бұрын
Great! Can you tell how I could get the boards and 486SXLC2 CPU? Are you interested to create PIstorm similar board /* use PIpico with local SRAM or PIzero */ for the 386SX M/B? Such CPU board could become ultimate upgrade - ARM uC could break 16Mb limit and emulate even 586 performance. Actually it could emulate even 686 and PIV, but the performance will be not equal
@atheatos 11 ай бұрын
I have never seen a board with an 486sxlc2 all ready soldered in. You can take any 386sx M/B and try a mod maybe. As for my mod / little adapter boards, I only sell these to very few people that have exactly my Model of M/B and the skills to solder. Regarding making an 486sxlc2 M/B with local SRAM chips for ram, yeah this is on my scope. It will be nice for sure. The main issue is to find a suitable chipset with a datasheet and no intergraded memory controller. Then the problem is the Bios. I can find solutions to all that but it will take time to design this.
@alexloktionoff6833 11 ай бұрын
I'd like to get your board and 486sxlc2 to challenge my soldering skills /*I have ALI M1217*/ Can I ?@@atheatos
@alexloktionoff6833 11 ай бұрын
But 486sxlc2 with local SRAM will not give enough boost, as 133MHz ARM or 166Mhz ESP. Amiga users made PIstorm, PC users also could... Is it possible to ignore the m/b bios /*there are few open-source bioses for QEMU/Bosh*/and DRAM controller and use only CPU pins to access ISA bus?@@atheatos
@atheatos 11 ай бұрын
So far I did not had the time to research this in depth but it looks like the main problem is the intergraded DMA + memory controller. If you put local Sram for RAM, then DMA transfers will still go to the memory controller. So I think this needs a barebone chipset like from the 286 era that do not intergrade a memory controller, Using the socket to just access the busses will not work (probably). Regarding performance difference it is very hard to tell, all 16bit bus 386, 486 chips are bottlenecked massively by the low bus thought put. So this could be probably performing up to a normal 486SX at same speed with Dram. I am just looking making my own mini boards in general, and this is one of the options. I need to check more the bios thing also, it is a bit outside my skills.
@alexloktionoff6833 11 ай бұрын
I also bought about it... so: #0 how 486SLC cache works then with DMA? There must be a solution to make SRAM on PIstorm board too #1 even if we have problems with #0 all RAM above 16Mb /*fast-ram*/ is not accessible by ISA DMA could be made SRAM without a problem, and 16MB DRAM on mother-board /*slow-ram*/ - similar like in AMIGA.@@atheatos
@philscomputerlab Жыл бұрын
Amazing 😮😊
@atheatos Жыл бұрын
Thank you! I checked you video on this topic also a few days ago. It is nice you are also checking older platforms now.
@philscomputerlab Жыл бұрын
@@atheatos I've started doing a bit of research and Oh My there are so many variants and versions to explore. Very interesting but also confusing! Some seem to be Cyrix CPUs in disguise and other interesting nuggets of details.
@atheatos Жыл бұрын
I have now also the 486SXL2 (8KB L1 version of the 486DLC). Managed to run this also at 55MHz and 80MHz+ (X2 mul). The performance is very 486 like... ok with the limitation of the ISA VGA. I do not know when I will have the time to make this video. Quite busy these days :/
@philscomputerlab Жыл бұрын
@@atheatos Amazing! The clock doubled ones are really hard to find it seems.
@atheatos Жыл бұрын
yeah it is nearly impossible to find the 486sxl2 132p (386 socket) version, I do not have this either. But there is also a 168p (486 socket) one. It is way easier to find this one and I have made an adapter to 132p for this. I also have now the rare 486Drx2 (486DLC with x2 mul), not tested this one yet.
@NightSprinter Жыл бұрын
Also, 420MHz. Time to blaze those Win95 and DOS benchmarks.
@wskinnyodden Жыл бұрын
Electropolitic capacitors are a curse, just like politicians :P
@atheatos Жыл бұрын
XD
@stefanberg8419 Жыл бұрын
Great Video. Thanks for the information how to modify the cpu. My tillamook is now working with 450mhz and 3dfx voodoo 3 3000
@atheatos Жыл бұрын
wow 450MHz very nice! I have a few of these, most do not go above easily. My best is this on the video.
@stefanb2099 Жыл бұрын
@atheatos I got the freqency with FSB 110 (interpreted as 112) * 4 on my Asus P5A with 512kb Cache. V-Core is 2,4V. Test with 2.2V currently not tested but comming soon. More Power is not possible. My pci latency timer is working with 128. That is the only the different to your P5A. 128MB PC133 CL2, Voodoo3 3000 @180, A short sumery of my CPU performens. 3DMark 99 CPU: 2927 PCMark2002: 773
@atheatos Жыл бұрын
Very nice!
@jrherita Жыл бұрын
Hmm the doubler failing bug showing the BIOS settings - curious if there is a Shadow RAM/ ROM enabled in the BIOS that is blocking the Cyrix app from writing to a memory location the CPU is looking for.
@atheatos Жыл бұрын
Nice suggestion, I will check.
@ist1jano Жыл бұрын
I've got sp200s programmer - can it be used to flash 386/486 roms ? thanks
@atheatos Жыл бұрын
Not sure, probably not possible. The 386/486 usually have something like 27c512 ROM chips. Check your programmer support list.
@wskinnyodden Жыл бұрын
VLB Cards without the driver (or do not have their own bios to extend the onboard one) will perform like crap compared to what they can actually achieve. Trust me, I built many a VLB system back in the day.
@atheatos Жыл бұрын
Totally true.
@originalmiu Жыл бұрын
re: At 15:30 through 17:00, where 40MHz operation causes a freeze, and at 25MHz causes a jump into the system BIOS. The reason is that the CPU's A20M# line is not always consistent with the motherboard, and so (making a long story short) the CPU's internal cache will become corrupt. Does it work if the CPU's internal cache is disabled for "First 64KB of each 1MB boundary"? Also, when you jumpered OP1, and thought it was the FLUSH# line, are you absolutely sure you weren't off-by-one, and it's really connected to A20M# instead? Since this motherboard has no external cache, it would not make sense for it to signal FLUSH#, but the motherboard absolutely should somehow tell the CPU whether the A20 line is enabled. Perhaps the motherboard is not toggling A20 at the right time(s)? For more background info, do a Google search for "a20 line" (OSDev wiki and Wikipedia have good info).
@atheatos Жыл бұрын
Thank you for the information. I will have to check a few things again then. For OP1 I am 100% sure it connects to the FLUSH# input of the CPU. It is also marked as an option for Cyrix CPU on the M/B PCB. Without that for sure the internal cache do not work correctly. I do not remember if I checked the A20 line to be connected. In any case, with my setup all was fine except the clock doubling. I have also more M/Bs to check now, we will see.
@wskinnyodden Жыл бұрын
And Weitek? When?
@atheatos Жыл бұрын
I do not have one, probably not any time soon. These are too expensive and rare, also in the end while faster these have very limited support, so I do not have a priority to get one now.
@wskinnyodden Жыл бұрын
Have you yet tested a Weitek FPU together with an i387? There some DX boards that have both 387 and separate Weitek sockets, on these you can use both FPUs at the same time, would love to see that setup running!
@atheatos Жыл бұрын
Unfortunately I do not have a Weitek, very expensive and rare. CPU Galaxy has done this test with a Rapidcad + Weitek. I do not have a Rapidcad, same reason.
@wskinnyodden Жыл бұрын
Are you able to run Second Reality here? Or Unreal? With SBPRO compatible card. My SLC system was the most cursed PC I have had the luck of having. Kept crashing randomly on some software, and no it was not an hardware issue unless you count the CPU compatibility...
@atheatos Жыл бұрын
I would try, not sure as I have never run these, probably ok. My system is stable.
@wskinnyodden Жыл бұрын
That -cd test jumping into the BIOS is a behavior I had never seen before. How the heck did that cause the CPU to jump to some line on the BIOS ROM and resume from there instead of what the heck was supposed to happen?
@atheatos Жыл бұрын
yeah, a very strange problem... I do not know probably incompatibility with the chipset, I will have to check on other motherboards too.
@peterhenkel3020 Жыл бұрын
Hi, I have the 512k Version of this Boad running a K6-2 @ 620 MHz (FSB124). Thanks there were some useful tips in the video that I didnt know before regarding Chipset registers. For me a comparison how it would perform against the PII, early PIII or early Athlon would be interesting.
@atheatos Жыл бұрын
I agree all these comparisons could be very interesting and I have more than enough systems to do this! The only problem is that to make it fair I would have to optimize the other systems too and check a-lot of stuff. On top of this I am very busy these days and I have no time to make videos :/ But I will come back to this at some point.
@Ikkepop Жыл бұрын
God I love finish people speaking english, it's like a lullaby, it's so calming, I can just feel the stress escaping my body. PS cool mods, I would never have thought of extending cache like that :O I kind of wonder if we could just replace the normal DRAM dims with SRAM and remove the need for refresh. Holy crap Quake 1 running on a 386 in sort of playable speed even
@atheatos Жыл бұрын
Interesting... I am not Finish, I am Greek ^^. Regarding DRAM / SRAM, I have made something like that actually (simm-30s with SRAM). I just have no time to make videos now :/ Long story short unless you replace the memory controller there is no benefit as refresh can not be completely disabled. Only a custom M/B chipset and benefit from something like that. I might try this also in the future.
@pipschannel1222 Жыл бұрын
Super interesting content! I've been working a lot on " SUPER SX"-builds like these, just like you and K2. I have both the ALi and a variation of your board (an M396F with the SARC chipset) and the ALi is more suitable for upgrades like these SXLC2's, just like K2 experienced. The M396F is really primitive and lacks a few connections. On my M396F clock doubling doesn't work either but I have an earlier version that doesn't even have that little "op1-bridge/jumper". The maximum I could get out of that board is 30MHz without clock doubling. I think the ALi board K2 uses (same one I just bought for a very small amount but with tons of battery damage ;-) ) is a lot nicer to run CPUs like these as they have more connections to the chipset for cache coherency. I still have to figure this for myself as I just got the ALi board but out but I think with the little adapter you made these things can easily run at 50MHz without clock doubling, just like K2 did, which of course makes for a nice build. If I could only get one of those little adapter boards like you made... I will contact you about this separately! The IBM chips though really are the unbeatable SX class CPUs: Clock for clock they are a lot faster and they can also be clocked faster but are near unabtainium, especially on their own as IBM didn't sell them separately. To give you an idea of the speed of those things: My 16-bit IBM 486SLC2-40 upgrade easily outruns an SLX2-40, which is the 32-bit variant of the SXLC2.. Pretty impressive little CPUs those IBM SLCs! Especially my IBM SLC3 is really fast for a 16-bit CPU. Runs DooM like nobody's business! ;-)
@atheatos Жыл бұрын
I have so many new motherboards myself now too. Just absolutely no time for anything right now :/ On top of this, I have accumulated so much hardware I do not know what I have and where. I am trying to organize now. I have a few of IBM SLCs. These are for sure totally deferent. Based on original 486 core by intel. The biggest problem for me is the lack of documentation / pinout info. I will come back to videos at some point, I have so much to do and show to the people. :/
@pipschannel1222 10 ай бұрын
@@atheatos Very nice work you did here indeed with those little interposer boards 👌 Yeah, there's plenty of documentation on TI/Cyrix chips but IBM has always been very secretive about their designs and didn't share a lot because they didn't need to. You know: Those TI chips were meant for clone PC builds so they had a lot of incentive to share the way to implement them because it was directly linked to their sales. IBM was on the other side of the spectrum though. They were sick of the vast amount of clones eating up their market share and they very much wanted to dominate the PC industry again like they did with the 5150, 5160 and 5170 (their very succesful 1st gen/old school PCs) so they locked down every bit of low level technical detail and wanted to produce their own CPUs.. Even their technical reference manuals were very limited in terms of design decisions.. They really didn't want anyone to steal their designs again and hence they were very protective, which is of course understandible but which is also why I have great respect for other companies like Compaq who blew the clone market wide open with their crusade for open system standards 👍👍 It's the guys from Compaq who initiated IBM's demise in the desktop PC market but that was inevitable in the end as they opened the doors ten years before by designing their first PC by using of the shelf parts.. The irony 😄
@maniatore2006 Жыл бұрын
i had the 512kb version and back in time it was okay, i overclocked my AMD K6-2 550 to 600 stable, and also up to 700 MHz. Instable. Back in time i have no idea about undervolting or so. "Modern" PCI Graphic Cards 🤣😂 And i never needed to mod my keyboard it runs just fine. Thank you for that video.
@alfredklek 6 ай бұрын
I think I got mine up to like 680 (or something weird because of the clock multiplier). Mine ran like total shit though and i wound up underclocking to 500MHz just to keep it stable under win2k. I still have the board, would be fun to see what it could do with a proper modern CPU cooler.