INES Mapper 077: Difference between revisions
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m (refile, add cat:nescartdb. Also RE'd for trivia and found which 2KiB of the 10 were the NES's internal VRAM.) |
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[[Category:iNES Mappers]][[Category:Discrete logic mappers]] | [[Category:iNES Mappers|077]][[Category:Discrete logic mappers|077]][[Category:in NesCartDB|077]] | ||
Here are Disch's original notes: | Here are Disch's original notes: | ||
======================== | ======================== | ||
| Line 13: | Line 13: | ||
Notes: | Notes: | ||
--------------------------- | --------------------------- | ||
This mapper | This mapper uses an 8 KiB SRAM to provide 6 KiB of CHR-RAM and 4-screen mirroring! | ||
Registers: (** BUS CONFLICTS **) | |||
Registers: | |||
--------------------------- | --------------------------- | ||
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CHR-RAM is fixed at $0800-$1FFF. CHR-ROM is swappable at $0000: | CHR-RAM is fixed at $0800-$1FFF. CHR-ROM is swappable at $0000: | ||
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 | $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 $2000 $2400 $2800 $2C00 | ||
+---------------+---------------+---------------+---------------+ | +---------------+---------------+---------------+---------------+---------------+---------------+ | ||
| $8000,ROM | { | | $8000,ROM | {1},RAM | {2},RAM | {3},RAM | {0},RAM | Internal VRAM | | ||
+---------------+---------------+---------------+---------------+ | +---------------+---------------+---------------+---------------+---------------+---------------+ | ||
Revision as of 03:42, 4 August 2012
Here are Disch's original notes:
========================
= Mapper 077 =
========================
Example Game:
--------------------------
Napoleon Senki
Notes:
---------------------------
This mapper uses an 8 KiB SRAM to provide 6 KiB of CHR-RAM and 4-screen mirroring!
Registers: (** BUS CONFLICTS **)
---------------------------
$8000-FFFF: [CCCC PPPP]
C = CHR Reg (2k @ $0000)
P = PRG Reg (32k @ $8000)
CHR Setup:
---------------------------
CHR-RAM is fixed at $0800-$1FFF. CHR-ROM is swappable at $0000:
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 $2000 $2400 $2800 $2C00
+---------------+---------------+---------------+---------------+---------------+---------------+
| $8000,ROM | {1},RAM | {2},RAM | {3},RAM | {0},RAM | Internal VRAM |
+---------------+---------------+---------------+---------------+---------------+---------------+
