MV-LED: Difference between revisions
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[[File:mv-led2_schem.png|thumb|MV-LED2 board incomplete schematic.]] | [[File:mv-led2_schem.png|thumb|MV-LED2 board incomplete schematic.]] | ||
Connection to the MVS board visible in [[http://wiki.neogeodev.org/index.php?title=File:Mv1fs-page5.jpg | Connection to the MVS board visible in [[http://wiki.neogeodev.org/index.php?title=File:Mv1fs-page5.jpg on page 5 of the schematics]] | ||
=Repair= | =Repair= | ||
Latest revision as of 21:14, 15 August 2017
LED-based credits display board in original MVS cabs. Uses two 7-segment displays to show the player's remaining credits.
Uses CRE401 arrays for inputs.
Pinout, from left to right (pins 1 to 13):
- 5V
- 5V
- Clock
- Digit 1 ABCD
- Digit 2 ABCD
- GND
- GND
Digits are BCD-coded and controlled by registers REG_LEDLATCHES and REG_LEDDATA.
See also MV-ELA for the marquee board details.
Connection to the MVS board visible in [on page 5 of the schematics]
Repair
These boards can be tested in the system ROM's hardware test menu. The third screen shows "LED1" and "LED2" values which should change each second. The value shown should be the value displayed on the boards.