NES 2.0 Mapper 301: Difference between revisions
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NewRisingSun (talk | contribs) (Created page with "Category:Multicart mappers NES 2.0 Mapper 301 is used for ''GG1'' multicarts. Its UNIF board name is '''BMC-8157'''. ==Address latch ($8000-$FFFF)== Mask: $8000 A~FED...") |
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[[Category:Multicart mappers]] | {{DEFAULTSORT:301}}[[Category:Multicart mappers]] | ||
NES 2.0 Mapper 301 is used for ''GG1'' multicarts. Its UNIF board name is '''BMC-8157'''. | NES 2.0 Mapper 301 is used for ''GG1'' multicarts. Its UNIF board name is '''BMC-8157'''. | ||
Latest revision as of 06:43, 26 May 2020
NES 2.0 Mapper 301 is used for GG1 multicarts. Its UNIF board name is BMC-8157.
Address latch ($8000-$FFFF)
Mask: $8000
A~FEDC BA98 7654 3210
-------------------
.... ..PD POOI IIM.
|| |||| ||+- Select nametable mirroring type
|| |||| || 0: Vertical
|| |||| || 1: Horizontal
|| |||+-++-- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF
|| |++------ Select 128 KiB outer PRG-ROM bank
+|-+-------- Select 16 KiB inner PRG-ROM bank at CPU $C000-$FFFF
| 0: bank 0
| 1: same as CPU $8000-$BFFF (NROM-128)
| 2/3: bank 7 (UNROM)
+---------- Select 512 KiB outer PRG-ROM bank
Notes
- On carts with 512 KiB PRG-ROM or less, a jumper or DIP switch selects whether setting bit 8 will result in wrapped-around PRG-ROM data or open bus. This switches between a short menu with no and a long menu with repeats.
- CHR pattern data is stored in 8 KiB of unbanked CHR-RAM.
