[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