>> Eproms or PROMS? They're marked C1702A
>
>The first commercial EPROM's. 256 * 8. Very likely suffering
>from some form of bit rot... If
>they don't have opaque stickers over the quartz windows. put stickers on
*right
>now*!
OK, they already had stickers on them. I guess I should get these copied.
>Looking at the picture, there are 8 EPROM sockets with only 4 of them
>filled. Right? And what's the part number on the 40-pin DIP near
>where the power harness is attached? It looks a bit incongruous compared
>to the other ceramic packages on the board. Are those 10-turn
>trimpots to the left of that 40-pin DIP?
Yes, 8 sockets... 4 filled.
The 40 pin DIP at the front is AY-5-1013 / 7502
What's a trimpot?!! I can guess.
They're marked Helitrim Cw12 and have a tiny screw at the top.
>Where do the three ribbon cables from the CPU board going to? I assume at
>least one goes to the front panel - I'd guess the middle one.
The cables go to, from left to right...
1) a male 25 pin connector on the back of the chassis
2) to a board mounted behind the control panel - full of interesting small
white chips labeled Beckman
3) This is a bit tricky; a bit of this one goes to the control panel, and
another bit of it to a connector on the back (25 pin) with a sticker "TTY"
beneath it.
4) a female 25 pin connector just above the male one
Datanumerics DL8A can be seen at
http://www.comcen.com.au/~adavie/weird/datanumerics.html
Cheers
A
Received on Wed Mar 04 1998 - 18:53:49 GMT