GW 451 I/O card information needed

[acadiel]

I have this 8 bit GW 451 I/O card that I’m looking for information on. It has a DE25 female (parallel?) and a DE15 (joystick?) connector on the back. It has two ASYNC ports on the board (serial). Seven jumpers and three missing ICs.

https://www.icloud.com/sharedalbum/#B0YG4TcsmGXK00e

Looking for information on this card, what the jumpers do, what the missing ICs are, etc.

Thanks!

 

[modem7]

The W86C451 chip on your card supports one parallel port and one serial port. (Source: W86C451 data sheet.)

The missing chips are probably associated with an optional second serial port ("ASYN.2"): an 8250 UART goes into the U5 socket, and a line driver chip and a line receiver chip go into the other empty sockets.

Information on what could be a later version of the card, the GW451C, is at [here].

 

[acadiel]

Just in case anyone else finds this thread...

The second slot can be used for a regular UART - 16550 will work fine I'm told. The two missing chips are (left to right) a 75189 and a 75188.

The Jumpers are probably these: https://stason.org/TULARC/pc/io-cards/M-O/MICRO-EQUIPMENT-CORPORATION-Multi-I-O-card-UN-451.html