INES Mapper 236: Difference between revisions
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{{DEFAULTSORT:236}}[[Category:iNES Mappers]][[Category:Multicart mappers]] | {{DEFAULTSORT:236}}[[Category:iNES Mappers]][[Category:Multicart mappers]] | ||
'''iNES Mapper 236''' denotes the Realtec '''8155''' circuit | '''iNES Mapper 236''' denotes the Realtec '''8031''' and '''8155''' circuit boards, used for a number of multicarts with 128 KiB PRG-ROM and 64 KiB CHR-ROM: | ||
* ''35-in-1 (HM5511)'' | * ''35-in-1 (HM5511)'' | ||
* ''56-in-1 (NT-009)'' | * ''56-in-1 (NT-009)'' | ||
Revision as of 08:17, 25 April 2021
iNES Mapper 236 denotes the Realtec 8031 and 8155 circuit boards, used for a number of multicarts with 128 KiB PRG-ROM and 64 KiB CHR-ROM:
- 35-in-1 (HM5511)
- 56-in-1 (NT-009)
- 68-in-1 (HM5511)
- 70-in-1
A variant of this circuit board with 512 KiB PRG-ROM and 8 KiB of unbanked CHR-RAM is emulated under the same mapper number:
- 800-in-1
Due to the presence of four solder pads that select one of sixteen displayed game counts, the same ROM is bound to exist with different cartridge codes.
Lower Address Latch ($8000-$BFFF, write)
Mask: $C000
A~FEDC BA98 7654 3210
-------------------
10.. .... ..M. .CCC
| +++- CHR A15..A13 (with CHR-ROM)
| PRG A19..A17 (without CHR-ROM)
+------- Nametable mirroring
0: Vertical
1: Horizontal
Upper Address Latch ($C000-$FFFF, write)
Mask: $C000
A~FEDC BA98 7654 3210
-------------------
11.. .... ..SS .PPP
|| +++- PRG A16..A14
++------ PRG Mode
0: UNROM (PRG A14..16=111 when CPU A14=1)
1: Read Solder Pad (like SS=0, plus
PRG A0..A3=solder pad value)
2: NROM-256 (PRG A14=CPU A14)
3: NROM-128
