3 Jun
2026
3 Jun
'26
6:15 p.m.
Does anyone have any HN482764G or other 250nS or faster 2764 EPROMs they
can let go of inexpensively?
I could use 4 or 5. I will generate the shipping label from here so you
don't have to worry about the shipping costs.
Thank you,
Mike
3 Jun
3 Jun
9:41 p.m.
On 6/3/26 11:15, Mike Katz via cctalk wrote:
Does anyone have any HN482764G or other 250nS or
faster
2764 EPROMs they can let go of inexpensively?
I could use 4 or 5. I will generate the shipping label
from here so you don't have to worry about the shipping
costs.
I have 6 AM2764 devices. I have 5 that are AM2764ADC with
the notation for 12.5V PGM.
Looking these up, it seems that they are 250 ns Tacc. I
also have an AM2764DC, not sure what the difference is. I
also have a bunch of Intel, Fujitsu and TI 2764's, I can get
you the exact part #'s if you want to try looking them up.
Jon
4 Jun
4 Jun
4:18 a.m.
Jon,
The Hitachi part has a 21V programming voltage. I don't know if the T48
can go that high? I will have to check.
Thank you for your time. If you want to send me the part numbers, I
will figure out what will work the best for me.
Thank you,
Mike
On 6/3/2026 2:41 PM, Jon Elson via cctalk wrote:
On 6/3/26 11:15, Mike Katz via cctalk wrote:
Does anyone have any HN482764G or other 250nS or
faster 2764 EPROMs
they can let go of inexpensively?
I could use 4 or 5. I will generate the shipping label from here so
you don't have to worry about the shipping costs.
I have 6 AM2764 devices. I have 5 that are AM2764ADC with the
notation for 12.5V PGM.
Looking these up, it seems that they are 250 ns Tacc. I also have an
AM2764DC, not sure what the difference is. I also have a bunch of
Intel, Fujitsu and TI 2764's, I can get you the exact part #'s if you
want to try looking them up.
Jon
10:03 a.m.
FYI I have a small number of DataMan S4 programmers for possible re-homing.
Can be supplied with new NiCad packs and own modification of replacing
internal coin cell battery.
(Coin cell battery is soldered to the PCB and goes permanently flat in a
couple of days with no NiCad pack fitted... Found this out the hard way!)
Regards
Sid Jones
-----Original Message-----
From: Mike Katz via cctalk
Sent: Thursday, June 04, 2026 3:18 AM
To: Jon Elson via cctalk
Cc: Mike Katz
Subject: [cctalk] Re: HN482764G EPROMS
Jon,
The Hitachi part has a 21V programming voltage. I don't know if the T48
can go that high? I will have to check.
Thank you for your time. If you want to send me the part numbers, I
will figure out what will work the best for me.
Thank you,
Mike
On 6/3/2026 2:41 PM, Jon Elson via cctalk wrote:
On 6/3/26 11:15, Mike Katz via cctalk wrote:
Does anyone have any HN482764G or other 250nS or
faster 2764 EPROMs they
can let go of inexpensively?
I could use 4 or 5. I will generate the shipping label from here so you
don't have to worry about the shipping costs.
I have 6 AM2764 devices. I have 5 that are AM2764ADC with the notation
for 12.5V PGM.
Looking these up, it seems that they are 250 ns Tacc. I also have an
AM2764DC, not sure what the difference is. I also have a bunch of Intel,
Fujitsu and TI 2764's, I can get you the exact part #'s if you want to try
looking them up.
Jon
11:19 a.m.
On Thu, 4 Jun 2026, Sid Jones via cctalk wrote:
(Coin cell battery is soldered to the PCB and goes
permanently flat in a
couple of days with no NiCad pack fitted... Found this out the hard way!)
Is that a coin battery indeed or a supercap? I have a bunch of devices
dating back to 1990s equipped with supercaps for short-term backup power
that look the same as a coin cell each.
Maciej
12:20 p.m.
Yup. Coin cells. CR2032 with legs. And good old fashion leaded solder...
Regards
Sid
-----Original Message-----
From: Maciej W. Rozycki via cctalk
Sent: Thursday, June 04, 2026 10:19 AM
To: Sid Jones via cctalk
Cc: Sid Jones ; Maciej W. Rozycki
Subject: [cctalk] Re: HN482764G EPROMS
On Thu, 4 Jun 2026, Sid Jones via cctalk wrote:
(Coin cell battery is soldered to the PCB and goes
permanently flat in a
couple of days with no NiCad pack fitted... Found this out the hard way!)
Is that a coin battery indeed or a supercap? I have a bunch of devices
dating back to 1990s equipped with supercaps for short-term backup power
that look the same as a coin cell each.
Maciej
5:31 p.m.
On 6/4/2026 3:03 AM, Sid Jones via cctalk wrote:
FYI I have a small number of DataMan S4 programmers
for possible
re-homing.
Not to hijack the thread, but if these are ever available, I have
interest. I do have a competent USB programmer, which is perfectly
usable, but I do program ROMs at the vintage computer shows, and I think
having a standalone programmer might be better for the shows. I admit I
don't know much about standalone programmers, but I would appreciate
suggestions on things I should consider.
Jim
--
Jim Brain
brain(a)jbrain.com
www.jbrain.com
4:36 p.m.
On 6/3/26 21:18, Mike Katz via cctalk wrote:
Jon,
The Hitachi part has a 21V programming voltage. I don't
know if the T48 can go that high? I will have to check.
Thank you for your time. If you want to send me the part
numbers, I will figure out what will work the best for me.
I have 5 each AM2764ADC, and one AM2764DC. (I'm guessing
that the A version has a lower programming voltage as marked
on the device (12.5V).
I do have lots of Intel 2764's also (D2764A) Some have PGM
at 12.5V on the label.
I have a whole drawer of various 2764's, you can have all
you want for free, just cover the shipping.
Jon
6:07 p.m.
Jon,
Thank you. I only need two but I figured having 5 or so, just in case
would make sense.
If you package some up for me and send me the dimensions, weight and
your address, I can send you a prepaid shipping label.
Thank you,
Mike
On 6/4/2026 9:36 AM, Jon Elson via cctalk wrote:
On 6/3/26 21:18, Mike Katz via cctalk wrote:
Jon,
The Hitachi part has a 21V programming voltage. I don't know if the
T48 can go that high? I will have to check.
Thank you for your time. If you want to send me the part numbers, I
will figure out what will work the best for me.
I have 5 each AM2764ADC, and one AM2764DC. (I'm guessing that the A
version has a lower programming voltage as marked on the device (12.5V).
I do have lots of Intel 2764's also (D2764A) Some have PGM at 12.5V
on the label.
I have a whole drawer of various 2764's, you can have all you want for
free, just cover the shipping.
Jon
8:13 p.m.
Hi,
I've got several drawers full but looks like you're in good hands without
tariff complications.,
But if that's an HP 110 Portable Plus I'd love to chat with you; feel like
sending a PM?
(another) mike
On Thu, Jun 4, 2026 at 12:07 PM Mike Katz via cctalk <cctalk(a)classiccmp.org>
wrote:
Jon,
Thank you. I only need two but I figured having 5 or so, just in case
would make sense.
If you package some up for me and send me the dimensions, weight and
your address, I can send you a prepaid shipping label.
Thank you,
Mike
On 6/4/2026 9:36 AM, Jon Elson via cctalk wrote:
On 6/3/26 21:18, Mike Katz via cctalk wrote:
Jon,
The Hitachi part has a 21V programming voltage. I don't know if the
T48 can go that high? I will have to check.
Thank you for your time. If you want to send me the part numbers, I
will figure out what will work the best for me.
I have 5 each AM2764ADC, and one AM2764DC. (I'm guessing that the A
version has a lower programming voltage as marked on the device (12.5V).
I do have lots of Intel 2764's also (D2764A) Some have PGM at 12.5V
on the label.
I have a whole drawer of various 2764's, you can have all you want for
free, just cover the shipping.
Jon
7:13 p.m.
On 6/4/26 09:36, Jon Elson via cctalk wrote:
On 6/3/26 21:18, Mike Katz via cctalk wrote:
OK, the Intel D2764A is good for 250 ns, the 2764A-2 is 200
ns and the 2764A-1 is 180 ns. (I don't have any of these
last part #'s.)
JOn
Jon,
The Hitachi part has a 21V programming voltage. I don't
know if the T48 can go that high? I will have to check.
Thank you for your time. If you want to send me the part
numbers, I will figure out what will work the best for me.
I have 5 each AM2764ADC, and one AM2764DC. (I'm guessing
that the A version has a lower programming voltage as
marked on the device (12.5V).
I do have lots of Intel 2764's also (D2764A) Some have
PGM at 12.5V on the label.
I have a whole drawer of various 2764's, you can have all
you want for free, just cover the shipping.
5 Jun
5 Jun
12:01 a.m.
Jon,
May I have 4 D2764A and 4 2764A-2 please.
Send me the weight of the box, the dimensions of the box and your
address and I will email you a mailing label.
Thank you,
Mike
On 6/4/2026 12:13 PM, Jon Elson via cctalk wrote:
On 6/4/26 09:36, Jon Elson via cctalk wrote:
On 6/3/26 21:18, Mike Katz via cctalk wrote:
OK, the Intel D2764A is good for 250 ns, the 2764A-2 is 200 ns and the
2764A-1 is 180 ns. (I don't have any of these last part #'s.)
JOn
Jon,
The Hitachi part has a 21V programming voltage. I don't know if the
T48 can go that high? I will have to check.
Thank you for your time. If you want to send me the part numbers, I
will figure out what will work the best for me.
I have 5 each AM2764ADC, and one AM2764DC. (I'm guessing that the A
version has a lower programming voltage as marked on the device (12.5V).
I do have lots of Intel 2764's also (D2764A) Some have PGM at 12.5V
on the label.
I have a whole drawer of various 2764's, you can have all you want
for free, just cover the shipping.
3:27 a.m.
On 6/4/26 17:01, Mike Katz via cctalk wrote:
Jon,
May I have 4 D2764A and 4 2764A-2 please.
Send me the weight of the box, the dimensions of the box
and your address and I will email you a mailing label.
Well, I have 7 of the Intel D2764A, and 4 of the AM2764ADC
and one AM2764DC.
All of these should be 250 ns or faster.
I have no Intel D2764A-2.
When you let me know what you want, I'll weigh and measure.
Jon
3 Jun
3 Jun
9:57 p.m.
On 06/03/2026 12:15 PM EDT Mike Katz via cctalk
<cctalk(a)classiccmp.org> wrote:
Does anyone have any HN482764G or other 250nS or faster 2764 EPROMs they
can let go of inexpensively?
I could use 4 or 5. I will generate the shipping label from here so you
don't have to worry about the shipping costs.
Thank you,
Mike
Hi Mike,
I have several 2764's of various brands and types. I'm fairly certain I have at
least five that are 250ns or faster. Most or all were removed from various equipment over
the years. I certainly can't guarantee they will work. I would like to keep a
couple, otherwise if you are interested I will sent a list of all I have and you can have
all of them you want free as long as you pay shipping. Let me know if you want me to send
an inventory of sorts to select from.
I also have various others (27128s, etc) if you happen to need any more. Not as many of
them. But if you need others let me know and I will check what I have.
Will
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Sid Jones -
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