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| *SROMOEL, SROMOEU: from PRO-C0, System ROM byte /OE | | *SROMOEL, SROMOEU: from PRO-C0, System ROM byte /OE |
| *ROMOE: [[System ROM]] ROM /OE, output made from SROMOEU AND SROMOEL | | *SROMOE: [[System ROM]] ROM /OE, output made from SROMOEU AND SROMOEL |
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Revision as of 20:59, 26 June 2018
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| Package
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QFP64R
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| Manufacturer
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| First use
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1992 ?
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| Used on
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MV2B ...
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Quadruple 245 with additional OR and AND gates. Predecessor of NEO-BUF.
Internal logic
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- Pin 51 is enable for MCD0~MCD15
- Pin 39 is enable for PALD0~PALD15
- Pin 40 is direction select for D0~D7
- Pin 52 is direction select for D8~D15
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AES pinout
Palette RAM and memory card access. Palette RAM /WE and P1 ROM /OE generation.
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File:Neo-g0 aes pinout.png
OpenOffice Draw file: File:Neo-g0 aes.odg
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- D0~D15: 68k data bus
- PALD0~PALD7: Lower palette RAM data bus
- PAUD0~PAUD7: Upper palette RAM data bus
- MCD0~MCD15: Memory card data bus
- PAL: Palette RAM address decode from NEO-C1
- R/W: R/W from 68k
- PALWE: Palette RAM /WE, output made from PAL OR R/W
- ROMOEL, ROMOEU: from PRO-C0
- ROMOE: Cartridge P ROM /OE, output made from ROMOEU AND ROMOEL
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MV2B @ J4 pinout
68k data bus access for both slots.
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OpenOffice Draw file: File:Neo-g0 mv2b J4.odg
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- D0~D15: 68k data bus
- 1D0~1D15: Slot 1 68k data bus
- 2D0~2D15: Slot 2 68k data bus
- DS0,DS1: Slot 68k data enables from NEO-I0
- R/W: R/W from 68k
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MV2B @ J12 pinout
ADPCM buses access for both slots.
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OpenOffice Draw file: File:Neo-g0 mv2b J12.odg
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- SDRAD0~SDRAD7: ADPCM-A data bus from YM2610
- 1SDRAD0~1SDRAD7: ADPCM-A data bus for slot 1
- 2SDRAD0~2SDRAD7: ADPCM-A data bus for slot 2
- SDPAD0~SDPAD7: ADPCM-B data bus from YM2610
- 1SDPAD0~1SDPAD7: ADPCM-B data bus for slot 1
- 2SDPAD0~2SDPAD7: ADPCM-B data bus for slot 2
- 10 AS04: negated /ROE from YM2610
- 12 AS04: negated /POE from YM2610
- SLOT0, SLOT1: enables from NEO-F0
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MV2B @ B7 pinout
Palette RAM and memory card access. Palette RAM /WE and System ROM /OE generation.
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OpenOffice Draw file: File:Neo-g0 mv2b C7.odg
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Very similar connections with the one used in the AES.
- D0~D15: 68k data bus
- PALD0~PALD7: Lower palette RAM data bus
- PAUD0~PAUD7: Upper palette RAM data bus
- MCD0~MCD15: Memory card data bus
- 28 C0 (PAL ?):Palette RAM address decode from PRO-C0
- R/W: R/W from 68k
- PALWE: Palette RAM /WE, output made from PAL OR R/W
- SROMOEL, SROMOEU: from PRO-C0, System ROM byte /OE
- SROMOE: System ROM ROM /OE, output made from SROMOEU AND SROMOEL
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