PRO-CT0: Difference between revisions
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!Sprite graphics mux | !Sprite graphics mux | ||
!Security device | !Security device | ||
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[[File:proct0prog.jpg|thumb|PRO-CT0 9042KX023 on an AES cart [[PROG board]] as a security chip]] | [[File:proct0prog.jpg|thumb|PRO-CT0 9042KX023 on an AES cart [[PROG board]] as a security chip]] | ||
[[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]].]] | |||
Used on [[PROG board#PROG-G2|PROG-G2]] boards. It is found in [[Fatal Fury 2]] and [[Super Sidekicks]] only. It was SNK's first attempt at protecting NeoGeo games. | Used on [[PROG board#PROG-G2|PROG-G2]] boards. It is found in [[Fatal Fury 2]] and [[Super Sidekicks]] only. It was SNK's first attempt at protecting NeoGeo games. | ||
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|C15||C13||C11||C9||C14||C12||C10||C8||C7||C5||C3||C1||C6||C4||C2||C0 | |C15||C13||C11||C9||C14||C12||C10||C8||C7||C5||C3||C1||C6||C4||C2||C0 | ||
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For specific details see [[Fatal Fury 2]] and [[Super Sidekicks]]. | For specific details see [[Fatal Fury 2]] and [[Super Sidekicks]]. | ||
Revision as of 11:19, 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 | 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