Re: Help me ID this OLD card, please

[toddpw@ugcs.caltech.edu (Todd P. Whitesel)]

suprdave@aol.com (SUPRDAVE) writes:

>i picked up some cards at a hamfest and one two identical ones i cannot
>identify. it's a small card that looks quite old. the circuit board is almost a
>translucent color and doesnt have the quality of apple manufactured boards. it
>says COPYRIGHT 1979 JOHN J BELL, JR MADE IN USA. 79-295
>it has 5 sockets total, and two chips are labeled 8303  SY6522 and there is on
>74ls05N and a few resistors and capacitors. one of the cards has a 16pin ribbon
>cable soldered to where one of the sockets would be but it doesnt terminate
>into anything. anyone have ideas? i can take a pic of it and email if it will
>help. 

The only card I can think of that has two 6522's on it is the MockingBoard
sound card and its compatibles. There should also be two mid-size chips
labeled AY-8313 or some similar 4 digit number (I have data sheets at home
somewhere -- you might still be able to get them at Radio Shack or from
Rockwell). Those are the sound generators. The 6522's provided timers, glue,
and interrupt control.

Todd Whitesel
toddpw @ ugcs.caltech.edu