[Coco] eprom programmer

[Darren A]

On Sat, Mar 24, 2012 at 7:25 AM, Steven Hirsch wrote:
> On Fri, 23 Mar 2012, Darren A wrote:
>
>> A 27128 will work directly in an FD-502 controller so long as you
>> program the HDB-DOS DW code into the upper half (or both halves) of
>> the EPROM.
>
>
> Much more reliable to tack on a jumper that grounds the high address line.
> Then, just burn the lower half.
>


The unused address pins on the FD-502 ROM socket are already connected
to Vcc, thus the reason to use the upper half.

Darren