Re: 2764 -> 2364/68764 adapter

From: Francesco Messineo <>
Date: Wed, 13 Jul 2016 13:54:50 +0200
Message-ID: <>
ops sorry for the empty reply... sh.. happens

On Wed, Jul 13, 2016 at 1:44 PM, smf <> wrote:
> I also meant so say that converting 2764 pin 1 (Vpp) & pin 27 (_PGM) into
> something that would allow you to burn a 2364 is likely to be a lot more
> complex.

if you're desperate enough to want to program an MCM6876x (or whatever
with the same pinout) with a programmer not supporting it, consider
making an adapter to a 27512 pinout (and of course only using enough
address lines to cover the 64kbit one, tie the others to Vcc or GND).
The 27512 has an /OE/VPP single pin like the MCMs and such.
You must instruct your programmer to only burn the top (or bottom)
8KBytes and use a suitable Vpp:
MCM6876x = 25V
RD687C64 = 21V
27HC641 = 12.5 or 13V

Never trust my memory and always check on the datasheets, I'm not
guilty if your EPROM catches fire.
Even the old promenade C1 can burn these nice old ICs, what's all this
adapter stuff anyhow?
If you have a DATA I/O 21A, contact me, or it will probably not
program these chips even if it supports it.

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Received on 2016-07-13 12:02:29

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