Re: Help me identify this

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

sourada@iastate.edu (Steven D Ourada) writes:

>   has a 28 pin Textool ZIP socket with a 2716 in it
that's the EPROM "dock" with a guinea pig device in it already
>       a few 74xx's and a Motorola 6821 PIA
interface logic, especially the 6821 (two bytes worth of I/O and then some)
>       a 2716 EPROM (other than the one above) marked INTEL '77
the firmware
>       dip switches apparently to select EPROM size (16, 32, 64, set for 16
>        now) 
yep
>       a toggle switch with a LED at the 'front'
programming voltage. The LED probably lights up when it is set to program
voltage (12V or 21V depending on the EPROM, the card may only support one
of those; there might be a potentiometer or something else to let you pick
the actual voltage that gets switched in).

Do try PR#n'ing the card. I had one of these a while ago and that was how
you entered the on-board programming routines. To program something, load it
into memory first and then 'boot' the programmer board.

Todd Whitesel
toddpw @ cco.caltech.edu