[Coco] ROMMAX EPROM PROGRAMMER

[coco at yourdvd.net]

I couldn't find a supported device in the rommax software that matched
the oddball pinout of the roms in the tandy disk controllers. So I used
a header, something like robert gault suggested earlier and adapted it
to a 2764 footprint and the rommax was able to read it as a 2764.
Thanks - robert
p.s. I didn't actually need to read these ROMS - I could simply copy
them to floppy from a coco - I was just playing with the rommax because
it was the first one I came across digging through storage.
I have fun with this stuff - I guess that's what it's all about -r


> -------- Original Message --------
> Subject: Re: [Coco] ROMMAX EPROM PROGRAMMER
> From: Joel Ewy <jcewy at swbell.net>
> Date: Thu, May 03, 2007 7:28 am
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> 
> coco at yourdvd.net wrote:
> > Anyone on the list have any experience with the eetools.com rommax
> eprom
> > programmer? When I try to read a DECB 24 pin ROM as a 2764 it fails,
> but
> > if I set it to 2732, it reads it, but isn't the 2732 4k and the disk
> > basic rom 8k? I took the eprom out of my coco 2 controller (ADOS) (24
> > pin eprom) and same thing. I am running it on a 500 Mhaz k6-2 in DOS
> > mode (windows 98 command prompt) using the pentium version of the
> > software. I have other programmers in storage, but to dig for them....
> > Any assistance appreciated. - Robert
> >
> >
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> > Coco at maltedmedia.com
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> >
> >   
> The ROM chips used on the CoCo disk controller are indeed 8K, but in a
> 24-pin package.  They use a different pin for the high address bit, and
> so aren't pin-compatible with the 2764.  Hence the adaptors people have
> to wire up in order to stick the much more common 28-pin EPROMs into a
> CoCo disk controller.  The Disto controllers (at least the SC-1 & SC-2)
> used 28-pin ROM sockets, and can accept the 2764.  The part number you
> want to look for for the 24-pin 8K ROMs escapes me now, but I'm sure
> there are others on this list who can quote it for you off the top of
> their heads...
> 
> JCE
> 
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