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Joined: Feb 2014
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G
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G
Joined: Feb 2014
Posts: 712
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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.

Joined: Feb 2014
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G
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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.

Joined: Jan 2012
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Joined: Jan 2012
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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
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