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syzygy
Joined: 19 Dec 2023
Posts: 3
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 Posted: Tue Dec 19, 2023 12:52 pm Post subject: Unknown IBM card - keyboard module?? |
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From a completely different board (IBM 5291 Terminal Keyboard Schematic), I can identify...
U1 IBM 52 ESD
U2 NS 74154
U3 7404
from https://www.cpu-world.com/forum/viewtopic.php?t=18987 U4 is an 8051 MPU but I can't confirm that anywhere else
I am thinking it is a keyboard controller of some kind..anybody recognize it or suspect the system it comes from?
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Glory_Cloud
Joined: 24 Jul 2010
Posts: 2942
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| Posted: Wed Dec 20, 2023 4:07 pm Post subject: |
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| The IBM 5291 was a dumb terminal that was connected by a twinax cable and used in the IBM System 34's and System 36's as well. I believe there were two models of the 5291: 5291-001 and the 5291-002. If memory serves me correctly, the difference being the size of the screen on the terminal. I think that the keyboards were interchangeable between the -001 and the -002. |
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Guest
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| Posted: Wed Dec 20, 2023 4:58 pm Post subject: |
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| Glory_Cloud wrote: | | The IBM 5291 was a dumb terminal that was connected by a twinax cable and used in the IBM System 34's and System 36's as well. I believe there were two models of the 5291: 5291-001 and the 5291-002. If memory serves me correctly, the difference being the size of the screen on the terminal. I think that the keyboards were interchangeable between the -001 and the -002. |
Thanks, I appreciate the response. I didn't think this was from a 5291, but I really don't know. I was just using the schematic from a document on the 5291 to identify some of the chips. That schematic did help with a few chips but it definitely is not the schematic for this board.
I fear that I might not ever find out what it is from  |
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Elar
Joined: 16 Jul 2003
Posts: 746
Location: Tallinn, Estonia
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| Posted: Mon Dec 25, 2023 5:49 am Post subject: |
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| Seems to be capacitive coupling keyboard controller but not for standard PC model F or M. Judging by copyright date microcontroller is from MCS-48 family, most likely 8048. |
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syzygy
Joined: 19 Dec 2023
Posts: 3
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| Posted: Mon Dec 25, 2023 10:51 am Post subject: |
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| Elar wrote: | | Seems to be capacitive coupling keyboard controller but not for standard PC model F or M. Judging by copyright date microcontroller is from MCS-48 family, most likely 8048. |
Thanks! |
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