INES Mapper 036: Difference between revisions

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(I linked to it, I guess I should describe it.)
 
(use same register names as I've used on the pinout. no functional changes.)
 
(19 intermediate revisions by the same user not shown)
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[[Category:iNES Mappers|036]][[Category:GNROM-like mappers|036]]
[[Category:iNES Mappers|036]][[Category:GNROM-like mappers|036]]
[[iNES Mapper 036]] is apparently assigned to the board used some games published by TXC / Micro Genius. This is almost identical to oversize [[GNROM]] except that—as a workaround for incomplete documentation­—emulators only listen to writes to the range 0x8400 through 0xFFFE.
[[iNES Mapper 036]] is assigned to TXC's PCB '''01-22000-400''', featuring a [[74138]], a 74175, and usually a 24-pin ASIC labeled [[TXC 05-00002-010 pinout|05-00002-010]]. [http://glukvideo.info/listado-juegos-gluk Two games] are currently known to require this definition.
* Strike Wolf (also released as ''Comando de Lobos'')
* Policeman


''Strike Wolf'', at least, writes to registers at $4100-$4103, $4200, and $FFFF. It also tries to read from $4100.
Even though these games can evidently be emulated as a weird kind of GNROM, the hardware does something quite different:


It's not known what these other registers are supposed to do. Perhaps they're registers internal to the Famiclones made by TXC.
The CHR banking is definitely implemented using the two 7400-series ICs:
Mask: $E200
write $4200: [.... CCCC] - Select 8 KiB CHR bank
 
The PRG banking is part of the ASIC:
Mask: $E100
  read $4100: [xxRR xxxx]
              |||| ||||
              ||++------ Copy internal register 'RR' to data bus.
              ++---++++- open bus
Mask: $E103
  write $4100: If Increment is set, internal register 'RR' <- 'RR'+1
              Otherwise, if Invert is clear, copy internal register 'PP' to 'RR'
                          if Invert is set, copy '~PP' to 'RR'
  write $4101: [...V ....] - Invert Mode
  write $4102: [..PP ....] - Copy data bus to internal register 'PP'. Value is not yet exposed anywhere.
  write $4103: [...C ....] - Increment Mode
Mask: $8000
  write $8000: copy internal register 'RR' to PRG banking pins
 
Three additional games published by Gluk use the same PCB, with no ASIC. They were also released in other regions on different hardware, and ''only'' Gluk's editions are compatible with the above-mentioned CHR banking.
* F-15 City War
* Volley ball
* Puzzle
Compatibility code left in means that Gluk's editions of these three games are also emulatable as [[NINA-003-006|NINA-06]].
 
See also:
* http://forums.nesdev.org/viewtopic.php?p=167180#p167180 Thread about dumping Policeman starts here
* The same ASIC showed up in [[iNES Mapper 132]] and [[iNES Mapper 173]], wired differently.

Latest revision as of 19:51, 6 September 2018

iNES Mapper 036 is assigned to TXC's PCB 01-22000-400, featuring a 74138, a 74175, and usually a 24-pin ASIC labeled 05-00002-010. Two games are currently known to require this definition.

  • Strike Wolf (also released as Comando de Lobos)
  • Policeman

Even though these games can evidently be emulated as a weird kind of GNROM, the hardware does something quite different:

The CHR banking is definitely implemented using the two 7400-series ICs: 

Mask: $E200
write $4200: [.... CCCC] - Select 8 KiB CHR bank

The PRG banking is part of the ASIC: 

Mask: $E100
 read $4100: [xxRR xxxx]
              |||| ||||
              ||++------ Copy internal register 'RR' to data bus.
              ++---++++- open bus
Mask: $E103
 write $4100: If Increment is set, internal register 'RR' <- 'RR'+1
              Otherwise, if Invert is clear, copy internal register 'PP' to 'RR'
                         if Invert is set, copy '~PP' to 'RR'
 write $4101: [...V ....] - Invert Mode
 write $4102: [..PP ....] - Copy data bus to internal register 'PP'. Value is not yet exposed anywhere.
 write $4103: [...C ....] - Increment Mode
Mask: $8000
 write $8000: copy internal register 'RR' to PRG banking pins

Three additional games published by Gluk use the same PCB, with no ASIC. They were also released in other regions on different hardware, and only Gluk's editions are compatible with the above-mentioned CHR banking.

  • F-15 City War
  • Volley ball
  • Puzzle

Compatibility code left in means that Gluk's editions of these three games are also emulatable as NINA-06.

See also:

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