IBM PC 5150 Restoration

Рет қаралды 2,465

Green Screen

Күн бұрын

Пікірлер: 13

@McDuffington 5 ай бұрын

This was the first computer I used. Nice to see one back in action.

@stephenpearce8341 5 ай бұрын

That 5151 display looks practically mint condition, great find

@digitalarchaeologist5102 5 ай бұрын

Just recently restored and repaired my own 5150 (16 - 64K model) that I rescued from a skip, complete with 5151 and hard disk with controller and RAM card

@nanddoribeiro5677 5 ай бұрын

Hello to Old PC Lovers

@greenscreen5994 5 ай бұрын

Hello to Old PC Lover:)

@tenminutetokyo2643 5 ай бұрын

What a score!

@PlumGurly 5 ай бұрын

So there were mud dobber's nests in there. Wow. It probably sat in a garage or maybe a basement.

@PlumGurly 5 ай бұрын

If you can find an NEC V20 CPU, you can pull out the Intel 8088 and put that in its place for a little more performance. The V20 also had an 8080 or maybe Z80 mode. I never installed one for that reason, just the fact that it ran 8088 code faster than an 8088 could.

@greenscreen5994 5 ай бұрын

Thanks for the suggestions I will definitely do some upgrade in the future, but the first thing will be to add more RAM. 256kb is not much, in this case the easiest solution would be to add a PicoMEM card

@PlumGurly 5 ай бұрын

@@greenscreen5994 -- The V20 is a drop-in replacement. It may cause minor side-effects like a faster starting beep (though not most other sounds since they are routed through the system timer and not bit-banged as in the ROM beep) and possibly video artifacts. There is a malformed loop in the ROM to prevent the snow, and the original CPU and graphics boards mask that. Someone can rewrite the ROM to rework that loop and do some general speedup hacks such as removing stray NOPs that serve no purpose. In addition, if one intends on only using the V20 as the CPU and not swap it (or they want to add detection code and separate code paths for 8088 vs. V20), they can edit code that can benefit from the 186, 286, or V20/V30 instructions that it has and the 8088 doesn't have. An example is the block memory copy opcode.