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This one's a little tricky since it has a Print Timing Sensor (PTS) which is a slotted disk light sensor that will send pulses to INT1 of the upd7810.

It would move the carriage a little bit then start beeping until I made it send some pulses to the INT1 depending on carriage movement.

That works a little bit, but the self test will stop after 3 lines. I think it's erroring out because the pulses don't match the timing expected:


[Linked Image from i.imgur.com]

More experiments to see if that fixes it.

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I've been working on a Star dot matrix printer that uses a upd7800 which is a upd7801 that's romless. So far I've got it to move the cr at startup and respond to the online button, but it doesn't seem to respond to the LF or FF buttons.

The 7801 core doesn't have SIO implemented so it hangs up on a SKIT FS loop.

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@GC I have dumps and pictures from a Star NL-10, HP Deskjet 500, Nec Pinwriter P2+ and P6+, Commodore MPS 1270A and CTI CPA-80 printer. If you're interested, I can send them your way.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
rfka01 #120408 01/24/22 05:26 PM
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Yes, please. I'd be very interested. PM sent.

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@rfka01 @GC Pretty good collection. I'm also interested. Can you share with me too? Dumps I can offer are from Epson FX-85, IBM 3852-2 Color JetPrinter, Hyundai HDP-920, Apple ImageWriter II and some more models (I've listed here dot-matrix printers).

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You can get the files on https://mega.nz/folder/vAJyERCb#fP5enY0Ra5nhO7E_wZILOQ

I'll add the necessary information and upload what's missing to the FTP as well as usual.

@Lord Nightmare dumped the ROMs from the DEC LA-50 a while ago, maybe he can chime in as well.

@Artiom your dumps are most welcome!

Last edited by rfka01; 01/24/22 07:00 PM.

NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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@rfka01 Thank you very much. PM is sent and contains what I promised.

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I think the Dec LA-50 is very similar to the C-itoh 8510 / NEC 8023, but I think it has bigger roms and different functionality.
(IIRC it's made by TEC (Tokyo Electric Co), which is now Toshiba TEC)



Oh, imagewriter II roms you say? Yes, please!!

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I'm not sure if I need to say that, but PM sent.

Artiom #120415 01/25/22 10:47 AM
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Hi Artiom, thanks for the PM!

I've been searching for the Imagewriter II for a long time, but unfortunately it's not a rom dump but a capture of data sent to the printer.

Hexdumping it shows a bunch of ESC codes.

00000000 1b 63 1b 48 31 35 38 34 1b 66 1b 54 33 36 0a 1b |.c.H1584.f.T36..|
00000010 3c 1b 46 30 30 30 30 1b 4b 31 1b 50 1b 56 30 30 |<.F0000.K1.P.V00|
00000020 38 30 00 1b 47 30 30 31 32 03 03 03 03 0f 0f 0f |80..G0012.......|


I wonder what it actually prints when sent to a printer?


But there's all kinds of other things to study, this should keep me busy for awhile.

Lots of other stuff I've been looking for...

Many thanks!

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