Debugging stuck bits

I've been blocked on making progress on the retro pc project due to bad reads from the ROM. The seemingly simple snippet of boot code should light an led wired to to the i/o ports (any port). section .text resb 0x7F0 org 0x7F0 start: mov al, 0x1   again: out 0x10, al jmp again When … Continue reading Debugging stuck bits

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Sometimes it is a bad part… sometimes.

I've spent the last few weeks working on my retro pc project. The first step with the 8284 seemed to go well but the┬átrouble began when I tried wiring up the 8088. I wasn't getting anything remotely close to the expected boot sequence. According to the datasheet and The 8088 Project Book a few clocks … Continue reading Sometimes it is a bad part… sometimes.