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I built an 80286 system, starting on a breadboard, and I now have a PCB version running. I have a video series that includes key steps along the way, if you are interested. 8
I built an 80286 system, starting on a breadboard, and I now have a PCB version running. I have a video series that includes key steps along the way, if you are interested.
View Reddit by rehsd – View Source
r/vintagecomputing might be interested too
Very cool!
goddammit, don’t give me more project ideas!
i already wanted to do a PC XT clone because it seemed pretty simple, you just need the CPU, all the peripheral ICs, and then you can do the RAM/ROM/Logic however you want as long as it matches the original Memory/IO Map.
a 286 system looks more complex, but the block diagram you show makes it still look feasible to do DIY as everything important is in discrete ICs. and obviously a 286 is way more powerful than an 8088, so you can run much more software on it!
a 386 system would be even cooler, but it seems way more complicated as by that time most peripheral ICs, decoding logic, and such were combined into chipsets, so building your own 386 system would either require using an existing chipset or making your own using an FPGA or a lot of CPLDs.
then again having an open source 386 universal chipset for FPGAs similar to the C64 SID/PLA Replacements would be pretty sick for any retro PC guy.
What made you pick a 286 for this project over a 8088/86 or a 386sx?
Awesome work on this! I’m really impressed that you got this all working on breadboards before moving to PCB.
Could you go into a little more detail about your SD card interface? I am trying to decide how I want to provide removable storage media for my homebrew CPU project and SD card is a natural choice but I’m not sure how I should go about interfacing. Should I use an interposing microcontroller? Is there an off-the-shelf adapter solution that provides for a nice tidy 8-bit parallel interface suitable for an ISA-style system?
Sorry, didn’t watch the whole video. Is this a 4 layer board or something more?
This could be sleepy time background noise with that silky smooth voice! Super interesting content too
Dang, you’re a genius! I so desperately want to learn electronics as a hobby and the learning curve is so steep.