MV1A: Difference between revisions
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==Description== | ==Description== | ||
A strangely designed MVS board which uses some chips found in the NeoGeo CD. Maybe allowed SNK to cut costs by using chips for both systems. | |||
{{SlotInfo | |||
|year=Circa 1995 | |||
|slot_nb=1 | |||
|bios=Socketed | |||
|cart_orientation=horizontal | |||
|memcard_support=no | |||
|joystick_support=no | |||
|stereo_output=no | |||
|headphone_output=no | |||
}} | |||
==PALs== | |||
See [[MV1A PALs]]. | |||
==Scans== | ==Scans== | ||
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===Main Board=== | ===Main Board=== | ||
[[File:NEO-MVH MV1A Front. | [[File:NEO-MVH MV1A Front.jpg|800px|thumb|center|Main Board Front]] | ||
[[File:NEO-MVH MV1A Back. | {{Chipname|NEO-BUF}} list: | ||
*GA4: 68k bidirectional palette access | |||
*GA7: Read P1 and P2 inputs | |||
*GA8: Only half used, read REG_STATUS_B | |||
*GA9: 68k/Z80 communication | |||
*GA11: 68k data bus bidirectional buffer | |||
Others: | |||
*U10: 68k to Z80 latch, clear = SDZ80CLR (NEO-D0 44), clock = SDW (SNK1A 22, NEO-D0 33) | |||
*U11: Z80 to 68k latch, no clear, clock = SDZ80W (NEO-D0 43) | |||
*U3: | |||
**3(RAM4 22) = SNK1B-4 OR MGA-51 | |||
**6(RAM3 22) = SNK1B-4 OR MGA-53 | |||
**8(U4 1) = SNK1B-4 OR MGA-52 | |||
**11(U4 4) = SNK1B-4 OR MGA-54 | |||
*U2: | |||
**3(Cart) = ROMOEL OR MGA-51 | |||
**6(Cart) = ROMOEL OR MGA-53 | |||
**8(Cart) = ROMOEL OR MGA-52 | |||
**11(Cart) = ROMOEL OR MGA-54 | |||
*U3: | |||
**3(Cart) = ROMOEU OR MGA-51 | |||
**6(Cart) = ROMOEU OR MGA-53 | |||
**8(Cart) = ROMOEU OR MGA-55 | |||
**11(Cart) = ROMOEU OR MGA-72 | |||
[[File:NEO-MVH MV1A Back.jpg|800px|thumb|center|Main Board Back]] | |||
===Slot Board=== | ===Slot Board=== | ||
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[[File:NEO-MVH SLOT1A Back.png|800px|thumb|center|Slot Board Front]] | [[File:NEO-MVH SLOT1A Back.png|800px|thumb|center|Slot Board Front]] | ||
[[Category:Cartridge systems]] | |||
Latest revision as of 13:37, 13 May 2018
Description
A strangely designed MVS board which uses some chips found in the NeoGeo CD. Maybe allowed SNK to cut costs by using chips for both systems.
| Specification | |
| Year | Circa 1995 |
| Number of slots | 1 |
| System ROM | Socketed |
| Cart orientation | horizontal |
| Memory Card support | no |
| Joystick support | no |
| Stereo output | no |
| Headphone output | no |
PALs
See MV1A PALs.
Scans
Main Board
NEO-BUF list:
- GA4: 68k bidirectional palette access
- GA7: Read P1 and P2 inputs
- GA8: Only half used, read REG_STATUS_B
- GA9: 68k/Z80 communication
- GA11: 68k data bus bidirectional buffer
Others:
- U10: 68k to Z80 latch, clear = SDZ80CLR (NEO-D0 44), clock = SDW (SNK1A 22, NEO-D0 33)
- U11: Z80 to 68k latch, no clear, clock = SDZ80W (NEO-D0 43)
- U3:
- 3(RAM4 22) = SNK1B-4 OR MGA-51
- 6(RAM3 22) = SNK1B-4 OR MGA-53
- 8(U4 1) = SNK1B-4 OR MGA-52
- 11(U4 4) = SNK1B-4 OR MGA-54
- U2:
- 3(Cart) = ROMOEL OR MGA-51
- 6(Cart) = ROMOEL OR MGA-53
- 8(Cart) = ROMOEL OR MGA-52
- 11(Cart) = ROMOEL OR MGA-54
- U3:
- 3(Cart) = ROMOEU OR MGA-51
- 6(Cart) = ROMOEU OR MGA-53
- 8(Cart) = ROMOEU OR MGA-55
- 11(Cart) = ROMOEU OR MGA-72
Slot Board
