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View topic - Korean Master System Arcade Jamma Board

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Korean Master System Arcade Jamma Board
Post Posted: Mon Jun 01, 2015 10:32 am
Last edited by Bock on Mon Jun 01, 2015 11:39 am; edited 1 time in total
This has been on my todo list since literally a decade
Those bootleg Korean boards.

Board 1 (got it a long time ago from Valdivia)
Opa Opa
Tri Formation
Solomon no Kagi

Board 2 (just purchased from Korea and dumped this morning)
Alex Kidd in Miracle World
Makai Retsuden
1 dipswitch to select game
8 unknown dipswitchs
Bought from http://www.ebay.co.uk/itm/Arcade-pcb-board-SMS-SEGA-MASTER-SYSTEM-JAMMA-ALEX-KID...

Pictures of board 2 attached. Sorry it's missing a close up of the right part of the back side, should be ok? Bonus picture: a picture of irresponsible me using Ikea kitchen wares to remove the EPROMs from their socket because I have nothing else around me.

The five games are all dumped, we need to figure out insert coin mechanism and dipswitches.
IMG_3826.PNG (9.44 KB)
IMG_3826.PNG
IMG_3825.PNG (7.87 KB)
IMG_3825.PNG
board-front.jpg (1.2 MB)
board-front.jpg
board-frontA.jpg (1.3 MB)
board-frontA.jpg
board-frontB.jpg (1.3 MB)
board-frontB.jpg
board-frontC.jpg (1.23 MB)
board-frontC.jpg
board-back.jpg (1.19 MB)
board-back.jpg
board-backA.jpg (1.07 MB)
board-backA.jpg
board-backB.jpg (1.07 MB)
board-backB.jpg
board-eproms.jpg (765.73 KB)
board-eproms.jpg

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  • Joined: 08 Dec 2005
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Post Posted: Mon Jun 01, 2015 11:20 am
Interesting hardware! The pictured board has a Z80 CPU and presumably an SMS1 VDP (the large, covered chip). However there are several differences from an an SMS console:

  • The crystal runs at 11MHz, compared to 10.7386MHz in a real SMS. Presumably this is fed directly into the VDP and divided by 3 for the CPU (as in a real console) - but the CPU is a Z80B, rated for 6MHz. A Z80A rated for 4MHz should have been sufficient.

  • The board has a total of 4 8KB RAM chips where a real console has only 3.

  • The collection of small ICs on the board must implement the logic usually found in the on-cart mapper, as well as that usually handled by the in-console I/O controller.
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Post Posted: Mon Jun 01, 2015 11:35 am
I found pictures of the first board; taken in 2001, pardon the bad pictures.
DSCN3399.JPG (983 KB)
DSCN3399.JPG
DSCN3400.JPG (1.03 MB)
DSCN3400.JPG
DSCN3402.JPG (925.24 KB)
DSCN3402.JPG

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Post Posted: Mon Jun 01, 2015 1:58 pm
Wow, thats so cool (and small!), what a nice find :)
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Post Posted: Thu Jun 16, 2016 5:25 pm
Now THAT is cool! Would love to try one of these out on my Supergun!
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