Mega Drive / Genesis
Other Mega Drive / Genesis pages: Mega Drive / Genesis, Mega Drive II / Genesis 2, Genesis 3
Chip Info
IC BD M5 USA VA2
- IC1: CPU: SCN68000C8N64
- IC2: SRAM: SRAM 256Kb: 32K x 8-bit TC51832SPL-10
- IC3: SRAM: SRAM 256Kb: 32K x 8-bit TC51832SPL-10
- IC4: 315-5308
- IC5: 315-5309
- IC6: CPU: Z0840004PSC
- IC7: SRAM (Z80): D4168C-15
- IC8: 315-5313
- IC9: VRAM: VRAM 256Kb: 64K x 4-bit KM424C64Z-10, D41264V-12
- IC10: VRAM: VRAM 256Kb: 64K x 4-bit KM424C64Z-10, D41264V-12
- IC11: Audio Processor: YM2612
- IC12: Audio Amplifier: A1034
- IC13: RGB Encoder: CXA1145
- IC14: HA17358
- IC15: +5V Regulator: 7805
- IC16: 315-5345
- IC17: +5V Regulator: 7805
IC BD M5 USA VA3 (837-7071)
- IC1: CPU: SCN68000C8N64
- IC2: SRAM: SRAM 256Kb: 32K x 8-bit TC51832SPL-12
- IC3: SRAM: SRAM 256Kb: 32K x 8-bit TC51832SPL-12
- IC4: 315-5364
- IC5: 315-5309
- IC6: CPU: Z0840004PSC
- IC7: SRAM (Z80): D4168C-15-SG
- IC8: 315-5313
- IC9: VRAM: VRAM 256Kb: 64K x 4-bit MB81461-12
- IC10: VRAM: VRAM 256Kb: 64K x 4-bit MB81461-12
- IC11: Audio Processor: YM2612
- IC12: Audio Amplifier: CXA1034
- IC13: RGB Encoder: CXA1145P
- IC14: LM358N
IC BD M5 USA VA6 (315-5483)
- IC1: CPU: MC68000P8
- IC2: SRAM: SRAM 256Kb: 32K x 8-bit TC51832SPL-10, MCM51L832ASP10, HM65256BLSP-10
- IC3: SRAM: SRAM 256Kb: 32K x 8-bit TC51832SPL-10, MCM51L832ASP10, HM65256BLSP-10
- IC4: 315-5433
- IC6: CPU: Z08400044PSC
- IC7: SRAM (Z80): KM6264BL-10
- IC8: 315-5313
- IC9: VRAM: VRAM 256Kb: 64K x 4-bit KM424C64Z-10, D41264V-12
- IC10: VRAM: VRAM 256Kb: 64K x 4-bit KM424C64Z-10, D41264V-12
- IC11: Audio Processor: YM2612
- IC12: Audio Amplifier: CXA1034P, AN7108
- IC13: RGB Encoder: CXA1145P
- IC14: HA17358
- IC15: +5V Regulator: 7805
- IC17: +5V Regulator: 7805
PC BD M5 USA VA7 (171-6217-11)
The VA7 is almost a Genesis 2 PCB in a Genesis 1 case. It even shares the same PCB prefix (PC).
- IC1: CPU: MC68000FN8
- IC2: SRAM: SRAM 256Kb: 32K x 8-bit HM65256BLFP-10T
- IC3: SRAM: SRAM 256Kb: 32K x 8-bit HM65256BLFP-10T
- IC4: CPU: Z08400044PSC
- IC5: SRAM (Z80): KM6264BLG-10
- IC6: 315-5487-01
- IC7: VRAM: VRAM 256Kb: 64K x 4-bit HM53461ZP
- IC8: VRAM: VRAM 256Kb: 64K x 4-bit HM53461ZP
- IC9: BA10324AF
- IC10: BA10324AF
- IC11: RGB Encoder: CXA1145M
- IC??: +5V Regulator: 7805
Capacitor Lists
IC BD M5 / 837-6656
C1 220uF 16v C4 100uF 10v C5 10uF 16v C6 47uF 10v C13 10uF 16v C24 100uF 10v C31 10uF 16v C32 100uF 10v C30 10uF 16v C38 10uF 16v C40 1uF 50v C41 10uF 10v C42 1uF 50v C43 10uF 16v C44 1uF 50v C49 100uF 10v C50 220uF 10v C51 220uF 10v C52 100uF 10v C53 100uF 10v C55 10uF 16v C57 10uF 16v C58 1uF 50v C59 47uF 10v C60 47uF 10v C61 1uF 50v C62 1uF 50v C63 47uF 10v C64 10uF 16v C65 47uF 10v C66 47uF 10v C67 47uF 10v C68 47uF 10v C71 10uF 16v C72 10uF 16v C74 100uF 10v PCB: 839-0231 C1 47uF 10v
IC BD M5 VA1: 837-6832
List provided by zerohimself
C1 220uF 16v C4 100uF 10v C5 10uF 16v C13 10uF 16v C23 100uF 10v C24 100uF 10v C30 10uF 16v C31 10uF 16v C32 100uF 10v C38 10uF 16v C40 1uF 50v C41 10uF 10v C42 1uF 50v C43 10uF 16v C44 1uF 50v C49 100uF 10v C50 220uF 10v C51 220uF 10v C52 100uF 10v C53 100uF 10v C55 10uF 16v C57 10uF 16v C58 1uF 50v C59 47uF 16v C60 47uF 16v C61 1uF 50v C62 1uF 50v C63 47uF 16v C64 10uF 16v C65 47uF 16v C66 47uF 16v C67 47uF 16v C68 47uF 16v C71 10uF 16v C72 10uF 16v C74 100uF 10v C79 100uF 16v JPx 47uF 16v
IC BD M5 VA2: 837-6955
C1 220uF 16v C4 100uF 10v C5 10uF 25v C13 10uF 25v C23 100uF 10v C24 100uF 10v C30 10uF 25v C31 10uF 25v C32 220uF 10v C38 10uF 25v C40 1uF 50v C41 10uF 25v C42 1uF 50v C43 10uF 25v C44 1uF 50v C49 100uF 10v C50 220uF 10v C51 220uF 10v C52 100uF 10v C53 100uF 10v C55 10uF 25v C57 10uF 25v C58 1uF 50v C59 47uF 16v C60 47uF 16v C61 1uF 50v C62 1uF 50v C63 47uF 16v C64 10uF 25v C65 47uF 16v C66 47uF 16v C67 47uF 16v C68 47uF 16v C71 10uF 25v C72 10uF 25v C74 100uF 10v C79 100uF 16v C84 EMPTY
IC BD M5 USA VA2: 837-6992
List provided by segafan1989
Some VA2 may have an additional 100uF cap not listed below. Please let us know if you can identify the location!
One report of capacitor swap between C30/C60. The values in this list are correct, be sure to install values as listed below and not as fit during assembly.
C1 220uF 16v C4 100uF 10v C5 10uF 16v C13 10uF 16v C23 100uF 10v C24 100uF 10v C30 10uF 16v C31 10uF 16v C32 220uF 10v C38 10uF 16v C40 1uF 50v C41 10uF 10v C42 1uF 50v C43 10uF 16v C44 1uF 50v C49 100uF 10v C50 220uF 10v C51 220uF 10v C52 100uF 10v C53 100uF 10v C55 10uF 16v C57 10uF 16v C58 1uF 50v C59 47uF 16v C60 47uF 16v C61 1uF 50v C62 1uF 50v C63 47uF 16v C64 10uF 16v C65 47uF 10v C66 47uF 10v C67 47uF 10v C68 47uF 10v C71 10uF 16v C72 10uF 16v C74 100uF 10v C79 100uF 16v C86 100uF 10v JPx 47uF 10v
IC BD M5 USA VA3: 837-7071
C1 220uf 16v C4 100uf 10v C5 10uf 16v C13 10uf 16v C23 100uf 10v C24 100uf 10v C30 10uf 16v C31 10uf 16v C32 220uf 10v C38 10uf 16v C40 1uf 50v C41 10uf 25v C42 1uf 50v C43 10uf 25v C44 1uf 50v C49 100uf 10v C50 220uf 10v C51 220uf 10v C52 100uf 10v C53 100uf 10v C55 10uf 25v C57 10uf 16v C58 1uf 50v C59 47uf 16v C60 47uf 16v C61 1uf 50v C62 1uf 50v C63 47uf 16v C64 10uf 25v C65 47uf 16v C66 47uf 16v C67 47uf 16v C68 47uf 16v C71 10uf 16v C72 10uf 16v C74 100uf 10v C79 100uf 16v C86 100uf 10v JPx 47uf 16v BOT 220uf 6.3v - This cap may be installed on the PCB underside and attached to VCC (pin 18) on the VRAM (see picture)
IC BD M5 USA VA3: 220uF capacitor on PCB underside
IC BD M5 USA VA6
C1 220uF 16v C4 100uF 10v C5 10uF 16v C13 10uF 16v C23 100uF 10v C24 100uF 10v C30 10uF 16v C31 10uF 16v C32 220uF 10v C38 10uF 16v C40 1uF 50v C41 10uF 16v C42 1uF 50v C43 10uF 16v C44 1uF 50v C49 100uF 10v C50 220uF 10v C51 220uF 10v C52 100uF 10v C53 100uF 10v C55 10uF 16v C57 10uF 16v C58 1uF 50v C59 47uF 10v C60 47uF 10v C61 1uF 50v C62 1uF 50v C63 47uF 10v C64 10uF 16v C65 47uF 10v C66 47uF 10v C68 47uF 10v C71 10uF 16v C72 10uF 16v C74 100uF 10v C79 100uF 16v C86 100uF 10v C111 47uF 10v C112 10uF 16v
PC BD M5 USA VA7 (171-6217-11)
CE1 10uf 16v CE2 10uf 16v CE3 10uf 16v CE4 10uf 16v CE5 10uf 16v CE6 10uf 16v CE7 10uf 16v CE8 10uf 16v CE9 220uf 10v CE10 220uf 10v CE11 10uf 16v CE12 220uf 16v CE13 10uf 16v CE14 10uf 16v CE15 10uf 16v CE16 220uf 16v CE17 100uf 10v CE18 47uf 16v CE19 47uf 16v CE20 10uf 16v CE21 10uf 16v CE22 10uf 16v CE23 100uf 10v CE24 47uf 16v CE25 47uf 16v CE26 47uf 16v CE27 47uf 16v CE28 47uf 16v CE29 10uf 16v CE30 10uF 16v CE31 100uf 10v
Power Base Converter / Mega Adaptor
C1 47uF 16v C2 47uF 16v C4 1uF 50v (PBC only?)
Schematics
VA3
CPU, RAM, ASICs
Audio / Video
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VA4
PAL-G: CPU, RAM, ASICs
PAL-G: 315-5313, AV
VA6.5
PAL-G: CPU, RAM, ASICs
PAL-G: 315-5313, AV
Service Manuals
Mega Drive Maintenance Manual - PAL-G, August, 1992, Rev. A
Sega Service Manual - Genesis, Mega Drive PAL, Mega CD / Sega CD, No 010, April, 1994.
Parts specifications only for VA7 Genesis, VA6.5 PAL Mega Drive, and Mega CD / Sega CD
Identifying Different Versions
IC series
Since PCB swapping between these cases is trivial, you can't be sure which revision you have without powering on a Genesis 1. Apart from that, here are some clues as to which version of Genesis you're holding:
Early, VA2/3 without TMSS: FCC ID on bottom sticker: FJ846EUSASEGA
Later, VA5/6 with TMSS: FCC ID: FJ8USASEGA
No EXT port: Probably a VA5 / VA6
IC or PC/VA7
It's quite easy to identify whether a Genesis 1 is an IC series or PC (aka VA7) series. The ports are located in a different spot on the PC / VA7 units. If the power jack isn't all the way to the right, it's a PC / VA7 Genesis. From a component standpoint, the PC VA7 is basically a Genesis 2 in a Genesis 1 shell.