Those FF data are from keyboard scanning I think.

Hi there, great vid by the way. Do you think there was any logic as to why the faulty RAM chip would cause the seemingly errors you traced on the various data lines? Cheers

Could you do a video about automobile tools?

fantastic non destructive mod!

Is that thing compatible with pulse view?

Great video! I designed and programmed many games for the Spectrum back in the day and it's always good to see this kind of material on KZbin.

Just came across this - December 2025. I ended up with the CP/M 1.4 version, expansion system and 2 disc drives. I then built my own-design ram expansion cards (2) and a sound card. I ported CP/M 2.2 to it. I reboxed it with separate keyboard and a serial video terminal - a Newbury. I ran dBase II and word processing programs such as Framework on it and used it for ham radio RTTY too. I wrote a morse code decoding program - such fun. I'm horrified, now, how much that all cost me! I was a mainframe computer enginer so I was well into all that stuff. Maybe, just maybe, the cost and lonely hours spent on this hobby eventually led to my divorce; though I did teach my then wife professional WP51 software on it. Being made homeless I had to dump the lot together with tons of my then toys in the local recycling centre. No EBay then. So that was where mine ended up. Sad.

I really appreciate your projects and it will be interesting to see the integration to Manic Miner. Two comments/questions about what's seen in the video from a technical point of view. How would that LED strip distinguish a control byte with full brightness (11100000 + 11111) followed by 255 reach for BGR from the end frame? At 23:00 you use the bitRead() function but seem to feed the strip the bits from LSB (bit 0) to MSB (bit 7) when the specifications seem to indigate that the MSB should be sent first. Since your example only send 00 and FF the case is not caught. If the order is MSB first then feeding bitRead() with the value 7-bitCounter would be one way and another to change to for(bitCounter=7; bitCounter>=0; bitCounter--) Stay creative and happy hacking!

I am quite horrified by your code, sorry to say!

Like shitty flute: it’s shitty speccie!

400mhz?????? What!!!

😂😂😂😂😂😂😂😂

Have a happy holidays Happy little diodes

😁 The longer it goes on, the more it sounds like how I play... Merry Christmas.

Just like Christmas day.

Let’s make it a Ring tone 😂

Is there a shop where I can buy this board?

Hi I want a small and affordable thermal camera and the priority is that it can clearly detect snakes at a distance of 3 meters and in the dark at night. What do you think? Does the P2 have this ability? Another question is which images are better quality from the P2 or the P2 Pro?

It starts well and then gets increasingly Manic Miner

Just to wish you and fellow subscribers a very Happy Christmas. I enjoy your videos. You are doing what I would love to do if only I had the skills and knowledge! :-)

Damned Rifa caps!

Oh dear Rifa madness strikes again. Those old ones like to explode. BBC Micro owners like myself are very familiar with this issue.

This channel never fails to deliver, both on content and clean fun. Have a veryy Merry Christmas and a Happy New Year. Thanks for everything you do to entertain and inform.

Where can I buy your analyzer?

Hello, thank you for the videos. i am thinking of buying a Bench Power suply to perform repairs just like this. Yours seems to be ok, apart from the fact that with those analog adjust buttons its dificult to get the exact number you want. Do you recomend it or if you would buy now you would chose another model. (not expensive stuff, just for hobying)

Dr. Gusman is an absolute legend! AWESOME project!

The project is very interesting, but with this small sampling memory, it becomes not very usable.

hi What is the superiority of P2 over P2 Pro? Can it detect a snake well at 5 meters away at night in a meadow?

Thanks for the entertainment and sharing the incredible games with US 👏👍

Propagation delay is pretty much unavoidable with pixels like this (I'm using pixels to refer to each LED module containing the three different colour LEDs). For a strobe light, it would be better to use a string of plain LEDs with a transistor driver so they can all be turned on and off at the same time. Pixel-style RGB lights will always have a propagation delay. The other commonly used data transmission method for pixels uses only a data in pin and data out pin with no clock. Zeroes and ones are defined by how long a bit is high for, and the end of data is defined by a pause in data transmission. The data is sent in reverse order (last pixel in the chain transmitted first). You transmit just the three intensities for the three colours, then if you stop transmitting, the pixel uses the last three bytes to light up its LEDs. If you keep on transmitting, then the pixel starts transmitting the bytes it already received to its output, which allows them to be passed to the next pixel in the chain. The result is that you transmit the data for the last pixel in the chain first of all, then the data for the next-to-last, and so on until you transmit the data for the first pixel and then stop. The first pixel sees that you've stopped transmitting and so instead of transmitting the last three bytes it received, it uses them to light its LEDs. The next pixel along sees that the first pixel has stopped transmitting and does the same thing. This cascades down the line of pixels so that they all light up. There's still a propagation delay caused by each pixel needing to "notice" that it's no longer receiving new data and so it has to use the last three bytes it received as the data to light its LEDs.

Brilliant Jim, love it. Have a Merry Christmas buddy!

These are nice and easy to drive, because they have a dedicated clock line and a stop frame. WS2812 ‘Neopixels’ can be more of a challenge, as they depend on a rather rapid minimum clock speed, and the LEDs change when the input data stops for a short while. This means that the microcontroller can't afford to stop and think, so to speak. The disadvantage of clocking at a comfortable pace is that you can't implement fast changes on long strings. Great primer video, with (in my estimation) just the right amount of detail. I might have to get some of these myself!

Very cool and interesting video! Thanks for sharing

🎅🏼

Great video. The MM air gauge is delightfully pointless. Looking forward to it!! 👍

Any way to get the new V6 PCBs yet?

powerful

Interesting video. The delay of level shift IC is 7.4ns, RP2350 is running around 160Mhz. Normally, the GPIO pin will work under 100Mhz or less. No high speed capture device, No buffering....

13:50 Fucking hell man, the deer in England are literate?!? It's only a matter of time until they overthrow humanity, especially if the reading habits of bucks have evolved to embedded electronics. We're screwed. 😜

At 23:22 - It's not DRAM refresh, it's the I/O read (the immediately preceeding instruction is IN A, (C) - which in reality is IN A, (BC). Port FBFE is a ULA read such that it reads the part of the keyboard matrix. You will expect FF if no keys are being pressed (a key press will bring a databus line low). More strictly, it's port xxFE - and the high 8 bits will cycle through as it's scanning the keyboard matrix. DRAM refresh only occurs when the RFSH signal is asserted.

400M samples/s BUT divided by the number of channels! So keep that in mind.

Awesome

I like your videos

The problem with most MCU logic analyzers is the sample buffer size. For the Pico 2, it's 2.5 times larger than the original Pico but still only captures very small chunks at higher speeds. At 400 MHz, the buffer fills up in just 1.28 ms.

🥰🥰🥰

Nice project and video ! I may be wrong but it seems that you length tuned you’re data lines based on the PCB it self but you didn’t take in account the pico board which has different lengths from io pads to the microcontroller. I don’t know if the pcb layout of the pico 2 is open source to check that

Why have a custom board then use a pico why not add the chip on

Fascinating. I am going to have to build a few of these.

why the use of level shifters ?