INES Mapper 164: Difference between revisions
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All registers are initialized to $00 on reset. | All registers are initialized to $00 on reset. | ||
==PRG-ROM Bank Low/1 bpp Mode Switch ($5000, write)== | ==PRG-ROM Bank Low/1 bpp Mode Switch ($5000, write)== | ||
Mask: $ | Mask: $FF00 | ||
D~7654 3210 | D~7654 3210 | ||
| Line 36: | Line 36: | ||
* Because this register is initialized to $00 on reset, thus clearing bit 4 which causes UxROM mode, the game's reset vectors will be at the end of 16 KiB bank #31. | * Because this register is initialized to $00 on reset, thus clearing bit 4 which causes UxROM mode, the game's reset vectors will be at the end of 16 KiB bank #31. | ||
==PRG-ROM Bank High ($5100, write)== | ==PRG-ROM Bank High ($5100, write)== | ||
Mask: $ | Mask: $FF00 | ||
D~7654 3210 | D~7654 3210 | ||
| Line 43: | Line 43: | ||
++- PRG A20..A19 | ++- PRG A20..A19 | ||
==Microwire Interface ($5200, write)== | ==Microwire Interface ($5200, write)== | ||
Mask: $ | Mask: $FF00 | ||
D~7654 3210 | D~7654 3210 | ||
| Line 52: | Line 52: | ||
+------ 93C66 EEPROM CS output | +------ 93C66 EEPROM CS output | ||
==Microwire Interface ($ | ==Unknown ($5300, write)== | ||
Mask: $ | Mask: $FF00 | ||
All games just write $00 to this register. Its meaning is certainly not the one seen in [[INES Mapper 162]]/163. | |||
==Microwire Interface ($5500, read)== | |||
Mask: $FF00 | |||
D~7654 3210 | D~7654 3210 | ||
| Line 61: | Line 65: | ||
| | | | ||
+--- 93C66 EEPROM DAT input (inverted) | +--- 93C66 EEPROM DAT input (inverted) | ||
=See also= | =See also= | ||
* [[NES 2.0 Mapper 558]] is a later version which drops UxROM mode and connects the microwire interface to EEPROM differently. | * [[NES 2.0 Mapper 558]] is a later version which drops UxROM mode and connects the microwire interface to EEPROM differently. | ||
Revision as of 16:29, 1 August 2020
iNES Mapper 164 denotes the 燕城 (Yànchéng) cy2000-3 circuit board, used for the following games:
- Final Fantasy 太空戰士 V (G-003)
- 大話西游 (Dàhuà Xīyóu, G-004)
- 櫻桃小丸子 (Chibi Maruku-chan, G-005)
- 岳飛傳 (Yuèfēi Zhuàn, G-006)
- Dark Seed - 黑暗之蛊 (G-009)
- 口袋精靈: 金 (Pokémon: Gold Edition, not to be confused with several similarly-named ports of the same name)
Banks
- CPU $6000-$7FFF: 0-8 KiB unbanked PRG-RAM, not battery-backed
- CPU $8000-$BFFF: 16/32 KiB switchable PRG-ROM bank
- PPU $0000-$1FFF: 8 KiB unbanked CHR-RAM
- Nametable mirroring: hard-wired
The circuit board has address lines for 8 KiB of PRG-RAM, though all known carts mount either no or a 2 KiB RAM chip which is then mirrored three times across the respective address range. PRG-RAM is never battery-backed; all games save the game state to a 93C66 512-byte serial EEPROM.
Registers
All registers are initialized to $00 on reset.
PRG-ROM Bank Low/1 bpp Mode Switch ($5000, write)
Mask: $FF00
D~7654 3210
---------
C1QM PPPP
| +|-++++- PRG A18..A14 if M=0
| | ++++- PRG A18..A15 if M=1
| +------ PRG banking mode
| 0: PRG A14..A18=QPPPP when CPU A14=0,
| PRG A14..A18=11111 when CPU A14=1 (UxROM, 16 KiB switchable bank)
| 1: PRG A14=CPU A14, PRG A15..A18=PPPP (BxROM, 32 KiB switchable bank)
+--------- 1 bpp video mode: when PPU A13=0 ...
0: PPU A3=CPU A3, PPU A12=CPU A12 (disable 1 bpp mode)
1: PPU A3=CPU A0, PPU A12=CPU A9, both latched during
last rise of PPU A13 during R/W (enable 1 bpp mode)
- 1 bpp mode is an all points-addressable video mode that allows the 8 KiB CHR-RAM to hold just enough data for an entire screen.
- Because this register is initialized to $00 on reset, thus clearing bit 4 which causes UxROM mode, the game's reset vectors will be at the end of 16 KiB bank #31.
PRG-ROM Bank High ($5100, write)
Mask: $FF00
D~7654 3210
---------
.... ..PP
++- PRG A20..A19
Microwire Interface ($5200, write)
Mask: $FF00
D~7654 3210
---------
...S .C.D
| | +- 93C66 EEPROM DAT output
| +--- 93C66 EEPROM CLK output
+------ 93C66 EEPROM CS output
Unknown ($5300, write)
Mask: $FF00
All games just write $00 to this register. Its meaning is certainly not the one seen in INES Mapper 162/163.
Microwire Interface ($5500, read)
Mask: $FF00
D~7654 3210
---------
.... .A..
|
|
+--- 93C66 EEPROM DAT input (inverted)
See also
- NES 2.0 Mapper 558 is a later version which drops UxROM mode and connects the microwire interface to EEPROM differently.
