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compmahj: add notes, pcb info from Sean (nw)

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hap 2020-02-23 22:19:42 +01:00
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src/mame/drivers/compmahj.cpp
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@ -1,8 +1,37 @@
// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
// thanks-to:Sean Riddle
/***************************************************************************
Skeleton driver for Nintendo Computer Mahjong
Skeleton driver for Nintendo Computer Mahjong
2 PCBs, MJ-CPU and MJ-DR. Each chip is custom labeled.
MJ-CPU: MJ-01, MJ-02, MJ-04, 2*MJ-03
MJ-DR: 2*MJ-06, MJ-05
MJ-01 is definitely a Sharp LH5801 or LH5803 (?MHz). I'm not sure of the
difference; the pinouts are the same. The PC-1600 Technical Reference says
LH-5803 is an "upper" version of LH-5801 that supports most of the same
machine language instructions except SDP, RDP and OFF are NOPs.
MJ-02 is an LH5367 8Kx8 ROM. It is edge-enabled, so one of the CE lines has
to toggle for the byte at the address to be output. This is different from
most modern ROMs that you can dump by simply tying /CE low and setting
different addresses. It's mapped at $E000 - $FFFF.
MJ-03 is LH5101 256x4 SRAM. There are 2 of them to provide 256x8 RAM. They
are mapped to $8000-$80FF.
MJ-04 is a parallel I/O controller, like LH5081 or LH5810/LH5811, but it's
in a QFP48, whereas LH5081 is QFP44 and LH5810/11 is QFP60. The pinout
doesn't match either of those either, so it's not just one of those in a
different package.
MJ-05 is QFP44 and is likely LH5031 LCD dot matrix common driver.
MJ-06 is QFP96 and is likely LH5035A/LH5036A LCD dot matrix segment driver.
LCD display: 1st and 3rd row is 20 8*11-pixel characters. 2nd row is 19
8*10-pixel characters, and a couple of custom segments to the right.
20 buttons, 3-pos switch. There's a 12-pin connector for linking 2
Computer Mahjongs together, using MJ 8002 link cable.
****************************************************************************/
@ -51,5 +80,5 @@ ROM_START( compmahj )
ROM_LOAD( "mj02.bin", 0x0000, 0x2000, CRC(56d51944) SHA1(5923d72753642314f1e64bd30a6bd69da3985ce9) )
ROM_END
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
CONS( 1987, compmahj, 0, 0, compmahj, compmahj, compmahj_state, empty_init, "Nintendo", "Computer Mahjong", MACHINE_IS_SKELETON )
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
CONS( 1983, compmahj, 0, 0, compmahj, compmahj, compmahj_state, empty_init, "Nintendo", "Computer Mah-jong Yakuman", MACHINE_IS_SKELETON )