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Why emulate if i have orginal Asic's?
Very old topic... Gerald, hi! I do not know when you will read this post, but i have a small question to you. How about a mistake in schematic? IC2 pin 13 and IC3 pin 7 connection? May be IC3 pin 7 must be connected to pin 14 of IC2....?
Anyway, i don't want to injure you, dear Gerald, but in my one it works fine realy in this wariant 14-7. Working with all my keyboards, brand and noname china. May be it's mystical, but it works... Some time ago i decided to reanimate this (after four years )project. Two days of hard work, replacing avrs and hct138, cheking all wires and contacts... It starts working. I can place hear bios rom rp23256 and your hex files correctly operating in my case. May be it will help to some members of this forum...
Folks, I wonder if you could help me with this project I've built it on a piece of perfboard, using the bits and pieces I had at hand (SMD ATTiny2313 and DIL HCT138). It was a challenge to make it work, as I based my work on the 'wrong schematic' with A8/A9 swapped, but logic analyzer and a bit of brain work gave me the hint.Now, it sort of works, but a single keypress usually results in two different CPC keys being emulated - e.g., pressing 'w' on PS/2 keyboard results in 'wq' or 'qw' displayed on the screen. My first idea is that the ATTiny is somehow slow or whatever. Is there any specific change needed for ATTiny2313 (other than makefile target change)?Thanks!
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