0.83 [R. Belmont]
TODO :
- Palette is not right.
- Hook up gun inputs (?) via the 2 serial latches at d00004 and d00006.
- The entire 3D subsystem. Is there a DSP living down there?
- There are currently no differences seen between System 23 (Time Crisis 2) and Super System 23 (GP500, Final Furlong 2). These will presumably appear when the 3D hardware is emulated.
- Serial number data is at offset 0x201 in the BIOS. Until the games are running and displaying it I'm not going to meddle with it though.
- Add the sh2 in Gunmen Wars (no rom, controls the camera)
- Super System 23 tests irqs in the post. timecrs2c's code can potentially test 7 sources, but only actually test 5. With each source there is code to clear the interrupt and code to raise it. Levels 0 and 1 are not connected to anything according to the code.

WIP :
- 0.137: Namco System 23 update [R. Belmont, Guru]: Updated Guru Readme. More IRQ tests pass. Gunmen Wars I/O board runs and syncs. SH-2 shared RAM added for Gunmen Wars. Namco System 23 cleanups and added dips [O. Galibert]. Namco System 23 update [R. Belmont]: C422 pass IRQ test. Preliminary SH-2 hookup for GMEN games. SH-2 boots and copies the loader to private RAM then jumps to it. Transfer protocol for main program not yet understood. Final Furlong 2 has a GMEN board and camera; update it to use that subdriver. Hooked up start/coin/buttons for Gorgon. Fixed Panic Park crash. Enabled I/O board for timecrs2c so it can coin up. Cleanup. Added dipswitches 'Freeze?', 'Service Mode', 'Skip POST' and 6x 'Unknown'.
- 0.136u4: Namco System 23 update [R. Belmont, Olivier Galibert]: motoxgo and timecrs2 are now able to sync up and communicate with the emulated JVS I/O board. Fixed all games to run VBL toggle. Documented data and point ROM checks for future use. Added a whole bunch of ram, chips and data roms mappings. R. Belmont improved "Gorgon" h/w support and documentation, fixed a few POST fails, documented clocks and syncs measured by Guru and added Gorgon JVS I/O board and NVRAM for Gorgon. Final Furlong now gets farther. Get Gorgon games out of service mode, fix finlflng sound ROM loading. Added working inputs for TC2 test mode. Fixed Time Crisis 2 coin input. Fixed unknown H8/3xx opcode (PC=2) 100 (motoxgo, timecrs2b). O. Galibert added comments about the irq testing code, comment the probable dips a tad better and fixed the data rom mappings. timecrs2c reaches the test mode [O. Galibert]. Guru documented gun I/O boards.
- 3rd March 2010: R. Belmont - Incremental progress on Namco System 23 and friends continues. Got Rapid River to drop into attract mode, with these 2D graphics (and music and sound f/x): In other news, I found the coin input on Time Crisis 2 and was able to start a game, although without the 3D there's not much there.
- 2nd March 2010: R. Belmont - Olivier Galibert and I have gotten farther with Namco System 23 and derivatives - most of the games now boot past the self-test. The original Final Furlong will actually drop into attract mode, although the only graphics visible is the blinking "Insert 2 Coins" message. Music and horsey sound effects play though. Time Crisis 2 drops into the test menu now, so we need to get the controls hooked up next... Update: I got the inputs working for Time Crisis 2, which allows us to navigate the test menus.
- 0.135u2: System 23 update [Naibo Zhang]: Corrected memory mapping of palette RAM and handling of palette data. Power-On Self Test now shows correct colors.
- 0.131u3: Namco System 23 update [R. Belmont]: Changes and documentation added on how the I/O board is hooked up. The H8/3334 based TSS-I/O board sometimes handshakes successfully in Time Crisis 2 now but timing-related problems remain.
- 10th May 2009: R. Belmont - I got much closer to having the System 23 I/O boards running and communicating with the games for the 2 games where we have them dumped (Time Crisis 2 and Motocross Go!). The game now sends JVS RESET and SET ADDRESS commands to the I/O board and the I/O board OKs them but a bug in the H8/3002 core is preventing it from properly receiving the OK and proceeding right now.
- 0.131u1: R. Belmont hooked up System 23 serial communications between subcpu and I/O board.
- 0.129u1: R. Belmont fixed Real Time Clock used in Namco Systems 23 driver.
- 0.128u4: System 23 update [R. Belmont]: Added extremely preliminary support for I/O boards with the H8/3344.
- 6th October 2008: R. Belmont - With some help from Guru, I now have a better understanding of the various System 23 hardware configurations. Gorgon: AKA "System 22.5". This is the base from which all other S23s are derived. It's got a 133 MHz R4650 main CPU, the same H8/3002 "sub CPU" and C352 sound generator as System 12, the text tilemap from System 22, and as-yet unknown 3D hardware. It uses per-game I/O boards based on the Namco custom "C78", which is a Hitachi/Renesas H8/3334. The 3334 is an 8-bit version of the 16-bit H8/3002, and it communicates with the H8/3002 on the main board. System 23: This is 22.5 with the main CPU bumped to 166 MHz, changes to the memory map, and unknown changes to the 3D hardware. Other specs and the I/O board remain the same. System 23 "G-Men": Used for Gunmen Wars, this is System 23 with an added network board driven by an SH-2 CPU. Super System 23: This is 23 with a new-style I/O board based on a PIC16Cxx, which increases security somewhat. There don't appear to be any other changes to improve the graphics capability. Super System 23 Evolution 2: Used only for Crisis Zone, this bumps the main CPU to 200 MHz. Again, no other changes are known. Relative to all this Guru has dumped some of the C78s and I've put together an H8/3334 core in MAME to run them. The 8-bit and 16-bit H8s are binary compatible, but the on-board peripherals, bus widths, and interrupt semantics differ. So it wasn't too hard to share the opcode implementations with our existing H8/3002 core. I haven't yet figured out exactly how the I/O board talks to the 3002 on the main board, but the onboard serial ports of both chips seem like a reasonable guess (System 22 used a similar scheme with two M37702s instead of a 3002/3334 pair). The 3334 program enables it's serial port A and basically waits for something to happen, while the 3002 periodically sends a few bytes out it's serial port A and seems to expect a reply. Incidentally, the 3002 is expecting the same sorts of replies regardless of the I/O board type (C78 or PIC). The major difference for us is that Guru can dump the C78-type boards while the PICs will likely need decapping.
- 0.127u5: System 23 updates [R. Belmont]: Fixed text layer to show (palette is not right now). Added Rapid River with very preliminary support for Gorgon hardware. Adjusted Gorgon h/w MIPS clock to 133 MHz based on readme. Fixed sound CPU shared RAM. Communication not yet correct.
- 25th September 2008: R. Belmont - I've done some work recently on the Namco System 23/Super System 23 driver. Now the POST screens show up (in bad colors) and it currently dies because it can't handshake with the H8/3002 sound CPU (which the POST calls 'SUBCPU'). There appears to be a bug in MAME's H8 core that's causing it - the mainline main loop doesn't execute properly once interrupts are enabled. Stay tuned.
- 0.125u7: Fabio Priuli updated most Namco systems + a couple of old drivers sharing the input handling.
- 0.104u4: More Namco System 23 progress [R. Belmont]: Further hardware work, hooked up H8/3002 MCU and sound system and added many notes and Final Furlong 2 (World and Japan sets).
- 0.104u2: R. Belmont hooked up MCU ROM properly in the System 23 games and hooked up preliminary support for the text layer and palette in the Namco System 23 driver.
- 0.83: Added namcos23.c driver.
- 27th May 2004: R. Belmont sent in a preliminary driver for Namco Super System 23 which doesn't do anything yet.

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