3270pc, 5272, 5271 stuff wanted

I haven't got time to reply in detail, but be warned. 1. The IBM cards that went in the 3270PC range were _not_ the same as those they sold as upgrades - the latter drove ordinary displays, etc. 2. There were many popular 3rd party 3270 (3278/3279) emulator cards available, the best known being IRMA. Philip BTW I was wrong about the 5272 - it is 720 x 350 x 8 resolution. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 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