INES Mapper 086

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Revision as of 08:53, 22 April 2015 by Lidnariq (talk | contribs) (incorporate Disch's notes; reformat register bitmaps)
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iNES Mapper 086 designates Jaleco's JF-13 board used for the Red and Black releases of Moero!! Pro Yakyuu, the Japanese version of Jaleco's Bases Loaded.

Hardware

This board has 128 KiB PRG ROM, 64 KiB CHR ROM, no PRG RAM (the mapper ports are mapped in $6000-$7FFF instead, but that means no bus conflicts either), a 74HC139, two 74HC174s, and an additional ASIC "D7756C 148" by NEC that plays recorded speech compressed with ADPCM. An additional set of sample files is needed to emulate the sound chip.

Registers

PRG and CHR bank ($6000-$6FFF)

The PRG and CHR banking for this mapper is similar to GNROM or Color Dreams.

7  bit  0
.CPP ..CC
 |||   ||
 |++------ Select 32 KiB PRG bank at $8000
 +-----++- Select 8 KiB CHR bank at $0000

Audio control ($7000-$7FFF)

7  bit  0
..RP TTTT
  || ||||
  || ++++- Track number
  |+------ While 0 and no sound is currently playing, start (or restart) sound specified in lower 4 bits
  +------- If 0 for at least 19µs=34cycles, the µPD7756C is reset and sound playback stops

Track numbers used in the game:

0 Strike
1 Ball
2 Time
3 Out
4 Safe
5 Foul ball
6 Fair ball
7 Batter out
8 Play ball
9 Ball four
10 Home run
11 New pitcher
12 Ouch (hit by pitch)
13 Fool
14 blow sound?
15 shout of joy?

References