Re: Homebrew STG card

[Jon Elson <jmelson-at-artsci.wustl.edu>]

Paul Corner wrote:

> Hi Folks
>
> I've been giving some thought to a 'low cost' STG type board - I don't know if
> anyone on this list has any comments ?
> At the moment my thoughts revolve around a minimum chip count using a half
> length AT card. Basic spec at the moment consists of the following :
> 24 digital IO - 8255 chip
> 4 to 8 quadrature inputs - LS7266R1 ( 2 encoders per chip)
> 8 buffered analog outputs - 2 TL084 and a MAX547 DAC
> Plus 3 or 4 74ALS buffer and glue logic.

Another possibility is to encode all the logic, both ISA interface,
digital I/O, and the encoder counters into a programmable gate
array device.  Then, the entire board would consist of one big
chip, like the Xilinx XC95160 and one or two A/D and D/A
chips.

Jon