User:Lidnariq/Discrete Logic Table: Difference between revisions
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m (m180 only has 3 bits, but does have well-defined oversize) |
m (mention cprom and m96 here) |
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! colspan="1" rowspan="9"|32kB PRG bank bits !! 0 | ! colspan="1" rowspan="9"|32kB PRG bank bits !! 0 | ||
| [[NROM]] || [[Vs. System]] || [[CNROM]], [[iNES Mapper 087|87]], [[iNES Mapper 101|101]] || || || || || || oversize [[CNROM]] | | [[NROM]] || [[Vs. System]] || [[CNROM]], [[iNES Mapper 087|87]], [[iNES Mapper 101|101]], [[CPROM]]† || || || || || || oversize [[CNROM]] | ||
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!1 | !1 | ||
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!2 | !2 | ||
| [[AxROM|ANROM]]¹, [[BNROM]] || || [[GxROM|GNROM]], [[iNES Mapper 038|38]] || [[iNES Mapper 086|86]] || [[iNES Mapper 011|11]], [[iNES Mapper 036|36]], [[iNES Mapper 140|140]] || || oversize [[iNES Mapper 038|38]] | | [[AxROM|ANROM]]¹, [[BNROM]] || || [[GxROM|GNROM]], [[iNES Mapper 038|38]] || [[iNES Mapper 086|86]], [[iNES Mapper 096|96]]† || [[iNES Mapper 011|11]], [[iNES Mapper 036|36]], [[iNES Mapper 140|140]] || || oversize [[iNES Mapper 038|38]] | ||
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!3 | !3 | ||
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† 4F+4 CHR-RAM banking, not 8 CHR-ROM banking | † 4F+4 or 4+4F CHR-RAM banking, not 8 CHR-ROM banking | ||
¹ has mapper-controlled single-screen mirroring. | ¹ has mapper-controlled single-screen mirroring. | ||
Revision as of 04:01, 3 May 2013
It appears that all discrete logic mappers either switch 32kB at a time with no fixed bank ("GxROM-like"), or have a 16kB fixed bank and can switch the other ("UxROM-like"). The tables below illustrate the tradeoffs between CHR, PRG, and banking style.
| GxROM-like | 8kB CHR bank bits | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||
| 32kB PRG bank bits | 0 | NROM | Vs. System | CNROM, 87, 101, CPROM† | oversize CNROM | |||||
| 1 | AN1ROM¹ | MHROM | NINA-03/06 | |||||||
| 2 | ANROM¹, BNROM | GNROM, 38 | 86, 96† | 11, 36, 140 | oversize 38 | |||||
| 3 | AOROM¹ | 113 | ||||||||
| 4 | oversize AxROM¹ | oversize GNROM | ||||||||
| 5 | ||||||||||
| 6 | ||||||||||
| 7 | ||||||||||
| 8 | oversize BNROM | |||||||||
| UxROM-like | 8kB CHR bank bits | |||||||
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | ||
| 16kB PRG bank bits | 2 | 168† | ||||||
| 3 | UNROM, 94, 180 | 72, 78¹, 89¹, 93, 152¹ | ||||||
| 4 | UOROM | 70, 92 | ||||||
| 5 | ||||||||
| 6 | oversize 94 | |||||||
| 7 | ||||||||
| 8 | oversize UxROM, oversize 180 | |||||||
† 4F+4 or 4+4F CHR-RAM banking, not 8 CHR-ROM banking
¹ has mapper-controlled single-screen mirroring.
