diff options
Diffstat (limited to 'src/mame/machine/315-5838_317-0229_comp.cpp')
-rw-r--r-- | src/mame/machine/315-5838_317-0229_comp.cpp | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/src/mame/machine/315-5838_317-0229_comp.cpp b/src/mame/machine/315-5838_317-0229_comp.cpp index f4c0b69129b..6e703df17ff 100644 --- a/src/mame/machine/315-5838_317-0229_comp.cpp +++ b/src/mame/machine/315-5838_317-0229_comp.cpp @@ -4,31 +4,31 @@ 315-5838 - Decathlete (ST-V) 317-0229 - Dead or Alive (Model 2A) - 317-0229 - Name Club / Name Club Ver 2 (ST-V) (tested as RCDD2 in the service menu!) - 317-0231 - Print Club Love Love / Print Club Love Love Ver 2 (ST-V) + 317-0229 - Name Club / Name Club Ver 2 (ST-V) (tested as RCDD2 in the service menu!) + 317-0231 - Print Club Love Love / Print Club Love Love Ver 2 (ST-V) - Several Print Club (ST-V) carts have - an unpopulated space marked '317-0229' on the PCB + Several Print Club (ST-V) carts have + an unpopulated space marked '317-0229' on the PCB Package Type: TQFP100 Decathlete accesses the chip at 2 different addresses, however, I don't think there - are 2 channels / sets of registers, instead the 2nd set of addresses are just a - mirror that allows access to a different set of source roms; the tables etc. are - re-uploaded before every transfer. + are 2 channels / sets of registers, instead the 2nd set of addresses are just a + mirror that allows access to a different set of source roms; the tables etc. are + re-uploaded before every transfer. Dead of Alive has the source data in RAM, not ROM. This is similar to how some 5881 games were set up, with the ST-V versions decrypting data directly from ROM and the Model 2 ones using a RAM source buffer. - Decathlete decompresses all graphic data with the chip. + Decathlete decompresses all graphic data with the chip. - The Name Club games use the chip for decompressing data for the printer (full size - versions of the graphics?) + The Name Club games use the chip for decompressing data for the printer (full size + versions of the graphics?) - Print Club Love Love decrypts some start up code/data required for booting. + Print Club Love Love decrypts some start up code/data required for booting. - Dead or Alive decrypts a string that is checked on startup, nothing else. + Dead or Alive decrypts a string that is checked on startup, nothing else. Looking at the values read I don't think there is any address based encryption, for example many blocks where you'd expect a zero fill start with repeating patterns |