7 Feb
1998
7 Feb
'98
3:37 p.m.
Tony.
I just happened to have my cards out for cleaning.
Yours seems a bit different. I wonder if it's earlier or an expansion
card for the pc/xt to give it 3270 comm capability.
My connection card has:
The BNC
2x8435
a BUNCH of gates or st, these 74L???
no memory that I can see (the computer has 640k)
a clock/crystal marked 14.1523 mhz (1589449)
Some IBM chips
2x 5617135
????
I dunno...
Mike
Tony Duell wrote:
I have what I believe to be an interface card from a
3270 PC here. It's a
full-length 8 bit card with PC/3278 on it. The main chips are :
N8X305N (microcontroller)
3 off ROMs (15527-15529, Copyright 1983)
4 off 6116 RAM
DP8340 and DP8341 (Some kind of interface chip...)
Assorted TTL glue
Passives, including a reed relay
There's a single BNC connector on the bracket. There's also an expansion
edge connector at the top front, which seems to be linked to the ROM
pins/the microcontroller.
-tony