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ADP: Servicetastatur #13768

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stonedDiscord
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@stonedDiscord stonedDiscord commented Jun 2, 2025 •
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New machines marked as NOT_WORKING

Merkur Service Testgerät (ADP)

@stonedDiscord
Squashed commit of the following:
8c0d96c 
commit f672616
Author: stonedDiscord <[email protected]>
Date:   Sat May 31 16:41:23 2025 +0200

    cleanup

commit a281068
Author: stonedDiscord <[email protected]>
Date:   Sat May 31 15:05:06 2025 +0200

    doesnt work

commit e5a0981
Author: stonedDiscord <[email protected]>
Date:   Sat May 31 14:01:26 2025 +0200

    screen works

commit 7426aa4
Author: stonedDiscord <[email protected]>
Date:   Sat May 31 12:53:39 2025 +0200

    LCD read

commit 42439a9
Author: stonedDiscord <[email protected]>
Date:   Sat May 31 12:33:41 2025 +0200

    comments and lcd work

commit 7040399
Author: stonedDiscord <[email protected]>
Date:   Sun May 11 19:14:08 2025 +0200

    entire address

commit 9537c6b
Author: stonedDiscord <[email protected]>
Date:   Sun Apr 6 14:06:55 2025 +0200

    i2c and attempt at lcd

commit 4a3d89a
Author: stonedDiscord <[email protected]>
Date:   Sat Apr 5 20:26:10 2025 +0200

    servicetastatur
@stonedDiscord
correct info at top
e7459e8
@stonedDiscord
umlaut
c547b1b
@stonedDiscord
swap l an r
235f14e
@stonedDiscord
bus is not just lcd
e0b06a7
@stonedDiscord
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This is the service keyboard for all the machines in the adp folder.
It starts up but complains about the i2c eeprom being wrong/missing.

Picture, schematic and ROM (not by me):
https://archive.org/details/schaltplan-forum

@stonedDiscord stonedDiscord marked this pull request as ready for review June 10, 2025 13:50
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rb6502 commented Jun 10, 2025

Can it be made to write out a valid EEPROM? If so, we'd want to include that in the ROM set.

Also, how does this interact with the actual machines?

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stonedDiscord commented Jun 10, 2025 •
edited
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It plugs into the machine with a 6pin connector on a cable.
Wiping the EEPROM on a real one doesn't show the error message so I assume it can't detect it.
The EEPROM is used to save settings from one machine and apply them to others for when you have to set up an entire arcade hall.
If there is a way to write it out it's probably some key combination during startup, I tried to press some keys but I don't think they registered correctly.

@angelosa
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Perhaps the eeprom is expected to be 1 filled to make it initialize?

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	ROM_REGION(0x800, "eeprom", 0)
	ROM_FILL(0x000, 0x7ff, 0xff )

sadly didn't change anything

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Just to be sure:

  1. you need to delete your existing eeprom file, in nvram directory.
  2. ROM_REGION(0x800, "eeprom", ROMREGION_ERASEFF) has same effect.

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same result

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rb6502 commented Jun 13, 2025

It's likely the I2C comms aren't right - it might need a pull-up resistor on SCL and/or SDA or something of that nature.

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3 participants
@stonedDiscord @rb6502 @angelosa