[Coco] Programming a 68766 EPROM

[jdaggett at gate.net]

Warren

The 27xx series of chips with the exception  of the 2716 requires 12.5 volts for 
Vpp. The MCM68766 requires 25 Volts.  Be sure your progrmmer is setup to s 
upply that much voltage. Also to program the 68766 you need to bring the enable 
upto 5 Volts then put the data and address to the chip then raise the enable 
voltage to 25 volts. 

james

On 25 Aug 2006 at 18:31, Warren Hoslet wrote:

> I need some suggestions on what kind of programmer I can use to burn an 
> MCM68766 EPROM? I already have a Willem (PCB3) programmer which works great 
> for 27 series EPROMS, but I haven't been successful in wiring an adapter for 
> it that will work with the CoCos 24 pin format. I can't even get it to read 
> any of the CoCos ROMs.
> 
> I would liike to be able to burn some EPROMS for my disk controller, but 
> it's got the old 24 pin socket. I guess an alternative solution would be to 
> get one of the Cloud9 DOS adapters. Does anybody have one they'd be willing 
> to sell?
> 
> 
> 
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