INES Mapper 250: Difference between revisions

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(Updated info based on analysis of real PCBs)
 
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[[Category:INES Mappers|250]]
[[Category:INES Mappers|250]][[Category:MMC3-like mappers|250]]
INES Mapper 250 is a mapper by Nitra, it is used to pirate games such as Time Diver Avenger and the Queen Bee V.
[[INES Mapper 250]] is a mapper by Nitra, used for pirate games such as [[wikia:c:bootleggames:Time Diver: Avenger|Time Diver Avenger]] and the Queen Bee V.


This is probably either a duplicate of one of mapper 33 (Taito's TC0190)'s variants, or yet another variant.
Hardware consists of regular MMC3 chip connected in different way:
* A10 instead of A0 is used to determine which register to write to (i.e. the registers are at $8000, $8400, $A000, $A400, $C000, $C400, $E000, $E400 and their associated
* A7..A0 is used instead of D7..D0: the value written to each register is the lower byte of the address (i.e. address AND $00FF), data value is discarded
 
* Queen Bee V contains also 74153 mux which controls PRG-A13 resulting in the following change:
 
below
$8000 $8000 $a000 $c000 $e000
    0  MMC3  MMC3  0    1
 
Source: [http://krzysiobal.com/carts/?action=search&mpr=250]

Latest revision as of 20:10, 14 April 2023

INES Mapper 250 is a mapper by Nitra, used for pirate games such as Time Diver Avenger and the Queen Bee V.

Hardware consists of regular MMC3 chip connected in different way:

  • A10 instead of A0 is used to determine which register to write to (i.e. the registers are at $8000, $8400, $A000, $A400, $C000, $C400, $E000, $E400 and their associated
  • A7..A0 is used instead of D7..D0: the value written to each register is the lower byte of the address (i.e. address AND $00FF), data value is discarded
  • Queen Bee V contains also 74153 mux which controls PRG-A13 resulting in the following change:
below
$8000 $8000 $a000 $c000 $e000
   0   MMC3  MMC3   0     1

Source: [1]