INES Mapper 086

iNES Mapper 086 designates the JALECO-JF-13 board used for 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.

7654 3210
 |||   ||
 |++------ Select 32 KiB PRG bank at $8000
 +-----++- Select 8 KiB CHR bank at $0000

Audio control ($7000-$7FFF)

7654 3210
  || ||||
  || ++++- Track number
  ++------ Start/stop control

Disch thinks it's 2=start, other=stop.

References

• Disch's mapper docs
• D7756 datasheet
• BBS topics 762 and 4030