MV-LED: Difference between revisions

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Credits display board in original [[MVS systems]]. Uses 2 7-segment displays to show the player's remaining [[credits]].
[[File:mv-led.jpg|thumb|MV-LED board. Picture courtesy of [[http://thearcadeboneyard.com TheArcadeBoneyard]].]]


Uses [[CRE401]] RC arrays for inputs.
[[File:mv-led2.jpg|thumb|MV-LED2 board, same components, different size. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]]


To copy here: http://mvs.gotwalls.com/images/a/a6/Mv_led2_hardware1_front.jpg, http://mvs.gotwalls.com/images/b/b2/Mv_led2_hardware1_back.jpg
LED-based credits display board in original [[MVS hardware|MVS cabs]]. Uses two 7-segment displays to show the player's remaining [[credits]].


Connections:
Uses [[CRE401]] arrays for inputs.
*VCC
 
*VCC
Pinout, from left to right (pins 1 to 13):
*Clk
*5V
*5V
*Clock
*Digit 1 ABCD
*Digit 1 ABCD
*Digit 2 ABCD
*Digit 2 ABCD
Line 14: Line 16:
*GND
*GND


Digits are BCD-coded and controled by registers '''REG_LEDLATCHES'''($380031) and '''REG_LEDDATA'''($380041).
Digits are BCD-coded and controlled by registers {{Reg|REG_LEDLATCHES}} and {{Reg|REG_LEDDATA}}.
 
[[File:74ls47 digits.png|center]]


See also [[MV-ELA]] for the marquee board details.
See also [[MV-ELA]] for the marquee board details.


[[Category:Chips]]
[[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 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.
 
[[Category:Repairs]]
[[Category:Cartridge systems]]
[[Category:Cartridge systems]]

Latest revision as of 21:14, 15 August 2017

MV-LED board. Picture courtesy of [TheArcadeBoneyard].
MV-LED2 board, same components, different size. Picture courtesy of [MVS-Scans].

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.

MV-LED2 board incomplete schematic.

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.

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