According to the datasheet I pulled down from alldatasheets.com this is a rewriteable prom.
It specifies the memory retention is 10 years. If it doesn't have a battery, how can a time period of retention be specified, unless that is the supposed "wear out" period?
For programming I purchased a USB connectable TL866 unit. I do not know if it is capable of 31vdc though.
This unit has been updated several times since I bought mine.
http://autoelectric.cn/EN/TL866_main.html
I found UTsource has a few in used condition:
https://www.utsource.net/sch/ER1400.html
$1.84each minimum 2.
There also for sale on eBay in the $5+ range.
https://www.ebay.com/sch/i.html?_nkw=ER1400+ic&_sacat=0&_from=R40&am...
Here is some general info I found. You'll need to translate from Dutch to English, but here is the pertinent info:
https://www.circuitsonline.net/forum/view/162626
I have here a REVOX Tuner B261 (c. 1982) which uses a Mask Programmed Philips uProcessor (type MAB 8440 P) icm an antique "kind of EEPROM" (Yype GI ER1400), seesheet, to tune to FM transmitters and store all kinds of data from the stations "permanent" in an Electronic Memory.
These CMOS primordial memory ER1400 chips are apparently described with 31V DC. This kind of memory was apparently called an EAROM (Electrically Alterable Read Only Memory): only a thousand times can be written to a memory site and electrically they were not really reliable over the years...
Don Resor
-----Original Message----- From: NORMAN MACRAE via Jukebox-list jukebox-list@lists.netlojix.com Sent: Friday, April 18, 2025 3:18 AM To: Jukebox mailing list jukebox-list@lists.netlojix.com Cc: NORMAN MACRAE nmacrae23@btinternet.com Subject: [Jukebox-list] Re: NSM EA ROM Programming
It's an ER1400. I have a datasheet, there is no internal battery on that one. The Stamanns sell them and there is a note on their website saying to program them as detailed in the manuals. I didn't get it there though, their shop is currently closed.
According to the NSM manuals, there is a default code of all zeroes to enter the program and a one-off option to change the code which MUST then be remembered. I had no idea whether the code had been changed which is why I went the route of replacing the ROM when I couldn't access the program. I have successfully altered the program on these in the past but I have never needed to do one from scratch. Typically the problem I was expecting was a location with a corrupt entry. There is actually very little wrong with this ES2 jukebox - if I attempt to access the program and abort it (ie toggle the cabinet switch), it then it will work fine until power off. There is a guy here in the UK who only does NSMs, I have messaged him so I will let you know what he responds. It is Easter weekend so it will likey be next week (hopefully).
Norman.
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