I was about ready to recommend the same approach. Speed is not the issue.
Then when if the time ever comes to replace the part one could if have to
build a board to do any level/timing shifts.
A solution I've used before.
On Wed, Feb 17, 2016 at 5:52 PM, Rick Bensene wrote:
> Brent Hilpert wrot
Brent Hilpert wrote:
> Apparently there actually is an equivalent EPROM, according to this
> datasheet for the MM4203/MM5203 EPROM:
> http://www.datasheetarchive.com/dl/Scans-006/Scans-
> 00137265.pdf
>
> It states they are pin-compatible to the MM5213/MM5231 mask ROMs.
> The EPROM even has
On Tue, Feb 16, 2016 at 12:06 PM, Brent Hilpert wrote:
> Apparently there actually is an equivalent EPROM, according to this
> datasheet for the MM4203/MM5203 EPROM:
> http://www.datasheetarchive.com/dl/Scans-006/Scans-00137265.pdf
>
> It states they are pin-compatible to the MM5213/MM5231
On 02/16/2016 12:43 PM, dwight wrote:
It is interesting, I have 1702As that were programmed in 1973 sometime
and they still have their data ( used on my SIM4-01 ).
And yes, I have them backed up.
It is interesting that Data I/O has added supply current
checks. I've used many home made pin adapter
minute to put a typical adapter
together.
Dwight
From: cctalk on behalf of Brent Hilpert
Sent: Tuesday, February 16, 2016 11:06 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Old MOS Mask-Programmed ROM forgetfulness?
On 2016-Feb-
On 2016-Feb-15, at 11:25 PM, Eric Smith wrote:
> On Mon, Feb 15, 2016 at 11:31 PM, John Robertson wrote:
>> Rick, if you want to archive these PROMs (highly recommended) you should be
>> able to find a Data I/O 29B and get one of the programming packs that
>> supports NS chips. I may have such a c
Rick Bensene wrote:
> Hi, all,
>
> I have a question about old Mask-Programmed ROMs
>
> The part in question is the National Semiconductor MM5231. This part is
> a 2K-bit PMOS Mask-Programmed ROM, generally organized as 256x8, but
> also can be organized (via a MODE pin)as 512x4 bits. In this
On 02/15/2016 11:25 PM, Eric Smith wrote:
On Mon, Feb 15, 2016 at 11:31 PM, John Robertson wrote:
Rick, if you want to archive these PROMs (highly recommended) you should be
able to find a Data I/O 29B and get one of the programming packs that
supports NS chips. I may have such a combination in
On Mon, Feb 15, 2016 at 11:31 PM, John Robertson wrote:
> Rick, if you want to archive these PROMs (highly recommended) you should be
> able to find a Data I/O 29B and get one of the programming packs that
> supports NS chips. I may have such a combination in my collection, but that
> PROM is not
On 02/15/2016 10:25 AM, Rick Bensene wrote:
Hi, all,
I have a question about old Mask-Programmed ROMs
The part in question is the National Semiconductor MM5231. This part is
a 2K-bit PMOS Mask-Programmed ROM, generally organized as 256x8, but
also can be organized (via a MODE pin)as 512x4 bits
On Mon, Feb 15, 2016 at 11:25 AM, Rick Bensene wrote:
> I know some of the early MOS ROMs had issues with metallization creep
> that would cause data loss/corruption.
That would certainly do it, but it's the first time I've heard of it
with regard to masked ROMs.
> I have three different EPROM p
The ones you have to watch out for as a rule are those made by Mostek. Not
sure of the date when they changed to recipe.
If your still in/near PDX I will be getting my Unisite+ back in March and I
may have a working Model 29 that you can borrow.
-pete
On Mon, Feb 15, 2016 at 10:25 AM, Rick Bense
Hi, all,
I have a question about old Mask-Programmed ROMs
The part in question is the National Semiconductor MM5231. This part is
a 2K-bit PMOS Mask-Programmed ROM, generally organized as 256x8, but
also can be organized (via a MODE pin)as 512x4 bits. In this particular
application, the parts a
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