They do not make bipolar proms any more.
you can find them on ebay sometimes
some functions can be emulated by fast pals.
but not code storage.
Old arcade games use them for all sorts of things.
some old arcade game repair sites also sell the ICs
http://www.ebay.com/sch/i.html?_from=R40&_trksid=
On Sun, Sep 6, 2015 at 5:38 PM, Marc Verdiell wrote:
> It just dawned onto me that these were "write once" PROMs,
[...]
> I guess none of the modern ebay Chinese ones would do?
I'd suspect not, since bipolar PROMs are long obsolte.
> where can you get the blanks?
The usual surplus IC sources.
Jay, Mike, John,
Thanks for the helpful information. It just dawned onto me that these were
"write once" PROMs, not modern EEPROMs. Duh. So you get one shot at doing it
right...
The Data I/Os on ebay seem to be quite a bit more than $100 right now, I'll
keep looking. I guess none of the modern ebay
List of blank for 21MX and microcode :
That would be very usefull. Thanks in advance
---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel
antivirus Avast.
https://www.avast.com/antivirus
On Thu, 3 Sep 2015, Jay West wrote:
Marc wrote
HP 1000. Not only the standard 24 pin ROMs but the small 14 or 16 pin
bootloader ROMs that Jay showed me at VCF. What would be a good ROM
programmer that could read and write these of older HP equipment ROMs?
---
The Data I/O 29B works
On 09/03/2015 8:45 PM, Jay West wrote:
Marc wrote
HP 1000. Not only the standard 24 pin ROMs but the small 14 or 16 pin
bootloader ROMs that Jay showed me at VCF. What would be a good ROM
programmer that could read and write these of older HP equipment ROMs?
---
The Data I/O 29B wor
On 3 September 2015 at 10:15, John Robertson wrote:
> Some of the early ROMs had extra voltages and unusual select logic and for
> those you either need to make an adapter or get an ancient Eprom programmer
> to be able to read them.
>
> I use Data I/O 29B with a Unipak for most of my old timers,
On Thu, Sep 3, 2015 at 6:57 PM, Vlad Stamate wrote:
> I am not sure about the part number it was under the sticker with the
> ROM version (which btw was 09121 15510 REV A) and I put it back into
> the unit.
The PCA silkscreen diagram in the service manual shows F2364, which is
an 8Kx8 masked ROM.
Marc wrote
HP 1000. Not only the standard 24 pin ROMs but the small 14 or 16 pin
bootloader ROMs that Jay showed me at VCF. What would be a good ROM
programmer that could read and write these of older HP equipment ROMs?
---
The Data I/O 29B works perfectly for those old fusable link p
Some ROM don't have the same enables as 2716 or other EPROMs.
I usually make up a header that I ensure that the programming voltage
can't get to the ROM and I make high low switches for the various select
lines. Then I use a standard eprom programmer to read ROMs.
I could make something with an Ard
I was going to ask a similar question here, and I am sure it has been asked
before. I do have a HP 82901 and a HP 9121 but I am not equipped to read
ROMs, so I can't really help yet. Plus I will soon need the ability to burn
ROMs for my HP 85 and HP 1000. Not only the standard 24 pin ROMs but the
At 07:56 AM 9/3/2015, Vlad Stamate wrote:
>So I am asking what you all use to dump various ROMs from vintage
>PCs/peripherals/etc?
For 1980s ROMs I still use the Serial EPROM Programmer published in BYTE by
Steve Ciacia in the mid-80s.
Dale H. Cook, Roanoke/Lynchburg, VA
Osborne 1 / Kaypro 4-8
On 09/03/2015 4:56 AM, Vlad Stamate wrote:
While I was trying to read the ROM in my 9121 for Eric Smith I found
out that my Wellon VP-280 could not do it (it could not recognize it
and only read FF FF FF FF). I could use it however to dump the ROM of
an IBM PS2 that I cannot boot anymore (so it i
You may know all of this but just in case ...Assuming you have reader that
can detect ROM type and compatible with ROM you are trying to read. May be
jumper change required? For example my Logical Systems Shooter has a
different jumper thay must be installed for each EPROM type.
Bill Degnan
twit
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