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found a interesting artifact in a Mac SE

Posted by: markgeek36 on 2025-07-30 12:05:09 took the logic board out of a Mac SE today that ive had for awhile but never took out the board. I found an interesting surprise which is what im showing here. Unfortunately the CPU and ROM seem to be a custom part number that I can't figure out. googling their models numbers gets you nothing. Does anyone know more about this? I have found the manual on bitsavers so that does exist but I do not have the software. This computer did not come with a hard drive it had 2 floppies so im assuming the original owner used a scsi drive.

Posted by: markgeek36 on 2025-07-30 12:17:21 the l1a2165 turns out to be a asci made by LSI Logic

Posted by: finkmac on 2025-07-30 12:26:22 if you turn the card upside down you can see the name of the product. it's exactly what it says on the tin... an IBM 3270 terminal emulator card. not terribly useful for most people that don't have an 3270 establishment controller and system370/390/etc the software is in the same directory as the manual on bitsavers

Posted by: markgeek36 on 2025-07-30 14:41:02 i was wondering anyone had dumped the roms? the card itself doesn’t have a lot going on so it must of had some sort of serial to token ring/coax adapter

Posted by: cheesestraws on 2025-07-30 15:07:10 Not sure what CPU you're talking about? The DP8341N is the 3270 receiver, datasheet here: https://www.smichips.com/datasheets/1/e9/e9db/e9db668b4a6e40d5a655cd943d90dc55.pdf. Its output appears to be a parallel bus, not serial, which would account for the bus drivers.

Posted by: markgeek36 on 2025-07-30 17:36:51 the l1a2165 asic

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