Reversing the ATR8000
First Posted November 28, 2014
I
purchased my ATR8000 not too long after they came out.. I am not
sure of the year, but I think it was around 1982 or 1983. The
first step in reversing the ATR8000 is to redraw the schematic.
This is based on the REV C version that I got from SWP.
Issues that YOU can help me with.
1.
In the above schematic you see IC U46, which is a 32x8 prom.
It may be labeled 74S288, 74LS288 or even 82S123. What I
need to know is what is the content of this part. I can probably
get the content out by using my logic analyzer, but if somebody has
already done this, please let me know.
If you can help with with any of these issues, please email me at patchell <at> cox <dot> net.