PRO-CT0: Difference between revisions
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[[File:mvs_pro-ct0.jpg|right|thumb|PRO-CT0 9020KX032 on an MV-4 [[MVS system]], as a graphics serializer]] | |||
PRO-CT0 is an early SDIP64 gate array chip used as: | PRO-CT0 is an early SDIP64 gate array chip used as: | ||
*A sprite graphics multiplexer on AES carts and MVS boards, sometimes named ALPHA-8921, later replaced by [[NEO-ZMC2]] and then [[NEO-CMC]]. | *A sprite graphics multiplexer on AES carts and MVS boards, sometimes named ALPHA-8921, later replaced by [[NEO-ZMC2]] and then [[NEO-CMC]]. | ||
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|- | |- | ||
|Info by [[User:Kyuusaku]] | |Info by [[User:Kyuusaku]] | ||
|*D0~D15: 68k data bus | | | ||
*D0~D15: 68k data bus | |||
*A1~A19: 68k address bus | *A1~A19: 68k address bus | ||
*D0out~D7out: output to a LS245 which puts the data on | *D0out~D7out: output to a LS245 which puts the data on | ||
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=Use as graphics multiplexer= | =Use as graphics multiplexer= | ||
See [[NEO-ZMC2]]. | See [[NEO-ZMC2]]. | ||
=Use as security device= | =Use as security device= | ||
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[[File:crt_snk-9201.jpg|right|thumb|SNK-9201 chip found in a [[Super Sidekicks]] MVS cartridge. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]] | [[File:crt_snk-9201.jpg|right|thumb|SNK-9201 chip found in a [[Super Sidekicks]] MVS cartridge. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]] | ||
For specific details see [[Fatal Fury 2]] and [[Super Sidekicks]]. | |||
==Emulation== | ==Emulation== | ||
Revision as of 11:04, 7 January 2013
PRO-CT0 is an early SDIP64 gate array chip used as:
- A sprite graphics multiplexer on AES carts and MVS boards, sometimes named ALPHA-8921, later replaced by NEO-ZMC2 and then NEO-CMC.
- Security device in Super Sidekicks and Fatal Fury 2 AES and MVS cartridges, also named SNK-9201.
The device probably wasn't intended to be used as as security measure at first.
ALPHA-8921 is the original chip name when Alpha Denshi designed it.
Pinouts
| Sprite graphics mux
Warning: GAD/GBD order may be wrong: 1032 instead of 3210 ? |
Security device |
|---|---|
|
|
| Info by User:Kyuusaku |
the 68k bus when /PORTOEL goes low ($200000-$2FFFFF odd byte read). |
Internal logic
Kyuusaku's Verilog definition: File:Ct0.zip
furrtek's version:
Use as graphics multiplexer
See NEO-ZMC2.
Use as security device
Used on PROG-G2 boards. It is found in Fatal Fury 2 and Super Sidekicks only. It was SNK's first attempt at protecting NeoGeo games.
The chip is tied to the 68k address and data bus, listens to word writes and replies on odd addresses in the $200000-$2FFFFF address range.
The game program expects the chip to reply with specific data depending on the values written to it and will freeze if they are wrong.
Address bus mapping:
| A19 | A18 | A17 | A16 | A15 | A14 | A13 | A12 | A11 | A10 | A9 | A8 | A7 | A6 | A5 | A4 | A3 | A2 | /PORTWEL | A1 |
| C31 | C29 | C27 | C25 | C30 | C28 | C26 | C24 | C23 | C21 | C19 | C17 | C22 | C20 | C18 | C16 | H | EVEN | 12M | LOAD |
Data bus mapping:
| D15 | D14 | D13 | D12 | D11 | D10 | D9 | D8 | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
| C15 | C13 | C11 | C9 | C14 | C12 | C10 | C8 | C7 | C5 | C3 | C1 | C6 | C4 | C2 | C0 |
For specific details see Fatal Fury 2 and Super Sidekicks.
Emulation
MAME's HLE emulation (fatfury2_protection): [[1]]
Reads:
- To $255550, $2FFFF0, $200000, $2FF000, $236000, $236008: return dataout >> 24;
- To $236004, $23600C: return dataout >> 24 nibble swapped
Writes:
- To $211112, with data = $1111: dataout = $FF000000
- To $233332, with data = $3333: dataout = $0000FFFF;
- To $244442, with data = $4444: dataout = $00FF0000;
- To $255552, with data = $5555, read back from $255551, $2FFFF1, $200001, $2FF001: dataout = $FF00FF00
- To $256782, with data = $1234, read back from $36000 or $36004: dataout = $F05A3601
- To $242812, with data = $1824, read back from $36008 or $3600C: dataout = $81422418
- To $255551, $2FFFF1, $2FF001, $236001, $236005, $236009, $23600D, with data = $20: shift dataout left one byte