[Coco] Reading DOS Rom

[John Eric]

my programmer didn't support the 68xxx series /rom/eproms, so I stuck a 24-pin socket on top of a 28-pin socket bottom justified with pins 24, 21 and 18 bent out.i then wired pin 24 of the 24p socket to pin 28 of the 28 pin socket, pin21 of 24p to pin 2 of 28p, pin18 of 24p to pin 23 of the 28p. Then i placed the rsdos rom into the 24p socket and plugged the contraption into my eprom burner and read it as a 2764. Of course, you should verify my wiring to make sure i haven't messed anything up. -Jeric




________________________________
From: Steven Hirsch <snhirsch at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Wednesday, February 11, 2009 5:44:54 PM
Subject: Re: [Coco] Reading DOS Rom

On Wed, 11 Feb 2009, Darren A wrote:

> On Wed, Feb 11, 2009 at 4:15 PM, Steven Hirsch wrote:
>
>> Before I damage something, can anyone confirm that the ROM from a Tandy
>> floppy controller can be safely read on an EPROM programmer?  If so, what do
>> I setup for?  Is there an actual EPROM part number that uses the same pinout
>> as the masked ROM?  Can I simply setup for a 2764 and offset it in the
>> socket?
>>
>
> If it is an FD-502 with a 28 pin ROM then it can be read just as if it were
> a 2764 EPROM.  If it is a 24 pin ROM then the EPROM programmer would need to
> be configured for a 68764 or 68766 EPROM.

Thanks!  That's what I needed.  I have an FD-501 with the 24-pin ROM.



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