MV-LED: Difference between revisions

Revision as of 02:07, 3 March 2016

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):

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 [page 5 of the schematics]

@@ Line 3: / Line 3: @@
 [[File:mv-led2.jpg|thumb|MV-LED2 board, same components, different size. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]]
-Credits display board in original [[MVS systems]]. Uses two 7-segment displays to show the player's remaining [[credits]].
+LED-based credits display board in original [[MVS hardware|MVS cabs]]. Uses two 7-segment displays to show the player's remaining [[credits]].
-Uses [[CRE401]] RC arrays for inputs.
+Uses [[CRE401]] arrays for inputs.
-Pinout:
+Pinout, from left to right (pins 1 to 13):
-*VCC
+*5V
-*VCC
+*5V
-*Clk
+*Clock
 *Digit 1 ABCD
 *Digit 2 ABCD
@@ Line 16: / Line 16: @@
 *GND
-Digits are BCD-coded and controled by registers {{Reg|REG_LEDLATCHES}} and {{Reg|REG_LEDDATA}}. Clock on rising edge ?
+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.