Some AM27S35 dumped

[iz8dwf]

Hi all,
I was trying to impose some order to the spare IC mess.
I've found 4 AM27S35DC proms, date codes from 8322 to 8331.
Marked as:
LM8409 198F3
LM8412 193F3
LM8412 199F3
LM8413 195E3 LM8413 195F3 (this one seems marked twice)
I can't recall where they come from.
I've dumped them all and they seem to be state machine decoders.
If someone recognize the markings, please let me know.

Best regards
Frank

 

[Al Kossow]

that sort of looks like a DEC 23-xxxFx part number
I have no idea if a full list of DEC bipolar proms exists anywhere

 

[iz8dwf]

Indeed a possibility is that they come from a stack of MicroVax I boards that I had lying around some lifes ago.
Frank

 

[MattisLind]

It might be RQDX1. It used 27S35 chips. RQDX1 was used in MicroVax 1 systems as far as I know.

https://www.vcfed.org/forum/forum/genres/dec/58527-rqdx1-and-rqdx2-woes

 

[iz8dwf]

Oh yes Mattis!
Definitely I had one of those boards 25 years ago or something.
Thanks
Frank