INES Mapper 076: Difference between revisions
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[[Category:iNES Mappers|076]][[Category:MMC3-like mappers|076]][[Category:in NesCartDB|076]] | [[Category:iNES Mappers|076]][[Category:MMC3-like mappers|076]][[Category:in NesCartDB|076]] | ||
[[iNES Mapper 076]] represents '''NAMCOT-3446''', a board used only for the game [https://nescartdb.com/profile/view/2308/megami-tensei-digital-devil-story Megami Tensei: Digital Devil Story]. | |||
It rewires the [[iNES Mapper 206|Namcot 108]] mapper IC to be able to address 128 KiB of CHR, in exchange for coarser CHR banking. | |||
The PCB also has a [[7432]] which allows the use of a 28-pin CHR-ROM. | |||
Registers: | Registers: | ||
--------------------------- | --------------------------- | ||
Mask: $E001 | |||
$8000: [.... .AAA] | $8000: [.... .AAA] | ||
A = Address for use with $8001 | A = Address for use with $8001 | ||
$8001: [..DD DDDD] Data port: | $8001: [..DD DDDD] Data port: | ||
| Line 39: | Line 23: | ||
CHR Setup: | CHR Setup: | ||
--------------------------- | --------------------------- | ||
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 | $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 | ||
+---------------+---------------+---------------+---------------+ | +---------------+---------------+---------------+---------------+ | ||
| R:2 | R:3 | R:4 | R:5 | | | R:2 | R:3 | R:4 | R:5 | | ||
+---------------+---------------+---------------+---------------+ | +---------------+---------------+---------------+---------------+ | ||
PRG Setup: | PRG Setup: | ||
--------------------------- | --------------------------- | ||
$8000 $A000 $C000 $E000 | $8000 $A000 $C000 $E000 | ||
+-------+-------+-------+-------+ | +-------+-------+-------+-------+ | ||
| R:6 | R:7 | { -2} | { -1} | | | R:6 | R:7 | { -2} | { -1} | | ||
+-------+-------+-------+-------+ | +-------+-------+-------+-------+ | ||
Latest revision as of 01:27, 14 September 2023
iNES Mapper 076 represents NAMCOT-3446, a board used only for the game Megami Tensei: Digital Devil Story.
It rewires the Namcot 108 mapper IC to be able to address 128 KiB of CHR, in exchange for coarser CHR banking.
The PCB also has a 7432 which allows the use of a 28-pin CHR-ROM.
Registers:
---------------------------
Mask: $E001
$8000: [.... .AAA]
A = Address for use with $8001
$8001: [..DD DDDD] Data port:
R:2 -> CHR reg 0 (2k @ $0000)
R:3 -> CHR reg 1 (2k @ $0800)
R:4 -> CHR reg 2 (2k @ $1000)
R:5 -> CHR reg 3 (2k @ $1800)
R:6 -> PRG reg 0 (8k @ $8000)
R:7 -> PRG reg 1 (8k @ $a000)
CHR Setup:
---------------------------
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00
+---------------+---------------+---------------+---------------+
| R:2 | R:3 | R:4 | R:5 |
+---------------+---------------+---------------+---------------+
PRG Setup:
---------------------------
$8000 $A000 $C000 $E000
+-------+-------+-------+-------+
| R:6 | R:7 | { -2} | { -1} |
+-------+-------+-------+-------+
