Sega Mega Drive/Genesis Hardware
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This page is used to document details of the hardware for the Sega Mega Drive/Genesis.
Contents
Model 1[edit]
VA1 [IC BD M5 VA1][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Signetics | SCN68000C8N64 | 8MHz Processor | - |
| IC2/IC3 | Toshiba | TC51832SPL-12 | CMOS 256K (32K x 8) Pseudo-SRAM, 12ns | - |
| IC4 | SEGA | 315-5308 | I/O chip | - |
| IC5 | SEGA | 315-5309 | I/O chip | - |
| IC6 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC7 | NEC | D4168C-15-SG | 64K (8,192 x 8-BIT) NMOS XRAM | - |
| IC8 | SEGA | 315-5313 (Yamaha YM7101) | VDP | - |
| IC9/IC10 | ? | ? | Video 256K (64K x 4) DRAM | - |
| IC11 | Yamaha | YM2612 | frequency modulation synthesizer | - |
| IC12 | Sony | CXA1034 | Headphone amp | - |
| IC13 | ? | ? | ? | - |
| IC14 | ? | ? | ? | - |
| IC15 | ? | ? | ? | - |
| IC16 | Sega | 315-5339 (DIP16) | I/O chip | - |
VA2 [IC BD M5 USA VA2] 837-6992[edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Signetics | SCN68000C8N64 | 8MHz Processor | - |
| IC2/IC3 | Toshiba | TC51832SPL-12 | CMOS 256K (32K x 8-bit) Pseudo-SRAM, 12ns | - |
| IC4 | SEGA | 315-5308 | I/O chip | - |
| IC5 | SEGA | 315-5309 | I/O chip | - |
| IC6 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC7 | NEC | D4168C-15 | 64K (8K x 8) NMOS XRAM, 150 ns | - |
| IC8 | SEGA | 315-5313 (Yamaha YM7101) | VDP | - |
| IC9/IC10 | Samsung & NEC | KM424C64Z-10 & D41264V-12 | 256K (64K x 4-bit) VRAM & Dual-Port Graphics Buffer | - |
| IC11 | Yamaha | YM2612 | frequency modulation synthesizer (Sound Chip) | HERE |
| IC12 | Sony | A1034(CXA1034P/M) | Headphone amp | HERE |
| IC13 | Sony | CXA1145 | Video encoder | HERE |
| IC14 | Hitachi | HA17358 | dual operational amplifier | HERE |
| IC15/IC17 | ? | 7805 | +5V Regulator | - |
| IC16 | Sega | 315-5345 (DIP16) | I/O chip | - |
VA3 [IC BD M5 USA VA3] 837-7071[edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Signetics | SCN68000C8N64 | 8MHz Processor | - |
| IC2/IC3 | Toshiba | TC51832SPL-12 | CMOS 256K (32K x 8) Pseudo-SRAM, 12ns | - |
| IC4 | SEGA | 315-5364 | I/O chip | - |
| IC5 | SEGA | 315-5309 | I/O chip | - |
| IC6 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC7 | NEC | D4168C-15-SG | 8,192 x 8-BIT NMOS XRAM, 150 ns | - |
| IC8 | SEGA | 315-5313 | I/O chip | - |
| IC9/IC10 | Fujitsu | MB81461-12 | 256K (64K x 4-bit) VRAM | - |
| IC11 | |YM2612 | frequency modulation synthesizer | - | |
| IC12 | Sony | CXA1034 | Headphone amp | - |
| IC13 | Sony | CXA1145P | RGB Encoder | - |
| IC14 | ? | LM358N | Dual Operational Amplifier | - |
VA4 [IC BD M5 PAL VA4][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Signetics | SCN68000C8N64 | 8MHz Processor | - |
| IC2/IC3 | Toshiba | TC51832SPL-12 | CMOS 256K (32K x 8) Pseudo-SRAM, 12ns | - |
| IC4 | SEGA | ? | I/O chip | - |
| IC5 | SEGA | ? | I/O chip | - |
| IC6 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC7 | NEC | D4168C-15 | 8,192 x 8-BIT NMOS XRAM, 150 ns | - |
| IC8 | ? | ? | ? | - |
| IC9/IC10 | ? | ? | ? | - |
| IC11 | Yamaha | YM2612 | frequency modulation synthesizer | - |
| IC12 | ? | ? | ? | - |
| IC13 | ? | ? | ? | - |
| IC14 | ? | ? | ? | - |
VA5[edit]
The only difference is the IC4 315-5402.
VA6 [IC BD M5 PAL][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Hitachi | HD68HC000P8 | 8MHz Processor | - |
| IC2/IC3 | Motorola | MCM51L832ASP10 | CMOS 1024 BIT SRAM | - |
| IC4 | SEGA | 315-5433 | I/O chip | - |
| IC5 | SEGA | 315-5313A | I/O chip | - |
| IC6 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC7 | Fujitsu | MB8464A-10LL-SK | CMOS 65,536 SRAM | - |
| IC8 | ? | ? | ? | - |
| IC9/IC10 | ? | ? | ? | - |
| IC11 | Yamaha | YM2612 | Audio | - |
| IC12 | SONY | CXA1034P | Amplifier | - |
| IC13 | SONY | CXA1145P | Video | - |
| IC14 | ? | ? | ? | - |
VA6 [IC BD M5 USA VA6][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68000P8 | 8MHz Processor | - |
| IC2/IC3 | Motorola | MCM51L832ASP10 | 256Kb (32K x 8-bit) SRAM | - |
| IC4 | SEGA | 315-5433 | I/O chip | - |
| IC5 | SEGA | 315-5313A | I/O chip | - |
| IC6 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC7 | Samsung | KM6264BL-10 | 64Kb: (8K x 8-bit) SRAM | - |
| IC8 | SEGA | 315-5313 | I/O chip | - |
| IC9/IC10 | Samsung & NEC | KM424C64Z-10 & D41264V-12 | 256K (64K x 4-bit) VRAM & dual-port graphics buffer | - |
| IC11 | Yamaha | YM2612 | Audio | - |
| IC12 | SONY | CXA1034P | Headphone Amplifier | - |
| IC13 | SONY | CXA1145P | RGB Video | - |
| IC14 | Hitachi | HA17358 | Dual operational amplifier | - |
| IC15/17 | ? | 7805 | +5 Voltage Regulator | - |
VA7 [PC BD M5 USA VA7] 171-6217-11[edit]
The VA7 is almost a Genesis 2 PCB in a Genesis 1 case. It even shares the same PCB prefix (PC).
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68HC000FN8 | Processor | - |
| IC2/IC3 | Hitachi | HM65256BLFP-10T | CMOS 256K (32K x 8) High Speed Pseudo-Static RAM | HERE |
| IC4 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | - |
| IC5 | Fujitsu | MB8464A-10L | 64K (8192 words x 8 bits) Low Power SRAM | - |
| IC6 | SEGA | 315-5487-01 | I/O, Bus arbiter, VDP, ym2612, TMSS | - |
| IC7/IC8 | Hitachi | HM53461ZP-12SG | 65,536-WORDx4-bit Multiport CMOS video ram | HERE |
| IC9/IC10 | Rohm | BA10324AF | Op-amp | HERE |
| IC11 | SONY | CXA1145M | Video | - |
| IC12 | Toshiba | TA7805S | +5V Voltage regulator | - |
| List of Electrolytic Capacitors | ||||
|---|---|---|---|---|
| CE# | Capacitance | Voltage | ||
| CE1 | 10 μF | 16 V | ||
| CE2 | 10 μF | 16 V | ||
| CE3 | 10 μF | 16 V | ||
| CE4 | 10 μF | 16 V | ||
| CE5 | 10 μF | 16 V | ||
| CE6 | 10 μF | 16 V | ||
| CE7 | 10 μF | 16 V | ||
| CE8 | 10 μF | 16 V | ||
| CE9 | 220 μF | 10 V | ||
| CE10 | 220 μF | 10 V | ||
| CE11 | 10 μF | 16 V | ||
| CE12 | 220 μF | 10 V | ||
| CE13 | 10 μF | 16 V | ||
| CE14 | 10 μF | 16 V | ||
| CE15 | 10 μF | 16 V | ||
| CE16 | 220 μF | 16 V | ||
| CE17 | 100 μF | 10 V | ||
| CE18 | 47 μF | 10 V | ||
| CE19 | 47 μF | 10 V | ||
| CE20 | 10 μF | 16 V | ||
| CE21 | 10 μF | 16 V | ||
| CE22 | 10 μF | 16 V | ||
| CE23 | 100 μF | 10 V | ||
| CE24 | 47 μF | 10 V | ||
| CE25 | 47 μF | 10 V | ||
| CE26 | 47 μF | 10 V | ||
| CE27 | 47 μF | 10 V | ||
| CE28 | 47 μF | 10 V | ||
| CE29 | 10 μF | 16 V | ||
| CE30 | 10 μF | 16 V | ||
| CE31 | 100 μF | 10 V | ||
| Totals | ||||
| 17 | 10 μF | 16 V | ||
| 7 | 47 μF | 10 V | ||
| 3 | 100 μF | 10 V | ||
| 4 | 220 μF | 10 V | ||
Model 2[edit]
VA1 [PC BD MD2 VA1 USA][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68HC000FN8 | Processor | - |
| IC2 | Toshiba | TC511632FL-10 | 65,536 Word x 16 Bit Dynamic Ram | - |
| IC3 | ? | ? | ? | - |
| IC4 | SEGA | 315-5678 (?) | ? | - |
| IC5 | Fujitsu | M88464A-10L | 8K Words x 8-Bit (64K) CMOS SRAM Low Power | - |
| IC6 | SEGA | 315-5660 | ? | - |
| IC7 | OKI | M54C864-80 | 65,536-Word x 8-Bit Multiport DRAM | - |
| IC8 | ? | ? | ? | - |
| IC9/IC10 | ? | LM324 | Low power quad op amps | - |
| IC11 | SONY | CXA1145M | Video (RGB Encoder) | HERE |
| IC12 | ? | ? | Voltage regulator | - |
VA1.8 [PC BD MD2 VA1.8 USA][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC2 | Hitachi / Sanyo | 651632DFP-15 / LC331632M-12 | 512K (32K x 16-bit) SRAM | - |
| IC3 | ? | ? | ? | - |
| IC4 | Zilog | Z84C0006FEC | Zilog Z80 8-bit coprocessor | - |
| IC5 | Rohm | XLJ6265AF-10SL | 64K (8K x 8-bit) CMOS SRAM | - |
| IC6 | SEGA | 315-5660 | Custom I/O chip | - |
| IC7 | Samsung | KM428C64J-10 | 512K (64K x 8-bit) VRAM | - |
| IC8 | ? | ? | ? | - |
| IC9/IC10 | Rohm | BA10324AF | ground sense quad op-amp | - |
| IC11 | Sony / Samsung | CXA1145M / KA2195D | RGB Encoder NTSC+PAL / NTSC only | HERE |
| IC12 | ? | 7805 | +5V Voltage regulator | - |
VA1.8 [PC BD MD2 VA1.8 PAL][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68HC000FN8 | Processor | - |
| IC2 | ? | 651632DFP-15 | 512K (32K x 16-bit) SRAM | - |
| IC3 | ? | ? | ? | - |
| IC4 | Zilog | Z84C0006FEC | Zilog Z80 8-bit coprocessor | - |
| IC5 | Rohm | BR6265BF-10SL | 64K (8K x 8-bit) CMOS SRAM | - |
| IC6 | SEGA | 315-5660 | Custom I/O chip | - |
| IC7 | Hitachi | HM53861J-8 | 512K (64K x 8-bit) VRAM | - |
| IC8 | ? | ? | ? | - |
| IC9/IC10 | Rohm | BA10324AF | ground sense quad op-amp | - |
| IC11 | Fujitsu | MB3514 | RGB Encoder | HERE |
| IC12 | ? | 7805 | +5V Voltage regulator | - |
VA1.8 [PC BD MD2 VA1.8 ASIA][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68HC000FN8 | Processor | - |
| IC2 | Toshiba | TC511632FL-10 | 512K (32K x 16-bit) PSRAM, 100 ns | |
| IC3 | ? | ? | ? | - |
| IC4 | Toshiba | 84C00AU-6 | Z80 8-bit coprocessor | - |
| IC5 | ? | ? | 64K (8Kx8-bit) SRAM | - |
| IC6 | Sega | 315-5660 | - | |
| IC7 | Hitachi | HM53861J-8 | 512K (64K x 8-bit) VRAM | - |
| IC8 | ? | ? | ? | - |
| IC9/IC10 | Rohm | BA10324AF | ground sense quad op-amp | - |
| IC11 | Fujitsu | MB3514 | RGB Encoder | - |
| IC12 | 7805 | Voltage Regulator | - | |
VA2 [PC BD MD2 VA2 USA][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68HC000FN12 | Processor | |
| IC2 | Sanyo | LC331632M-12 | 512K (32768 words X 16 bits) Pseudo-SRAM | |
| IC3 | Rohm | BA10358 | Dual ground sense operational amplifier | - |
| IC4 | Zilog | Z84C0006FEC | Zilog Z80 8-bit coprocessor | - |
| IC5 | ? | XL J6265AF-10SL | - | |
| IC6 | Sega | 315-5786 (Toshiba T9N13BF) | - | |
| IC7 | Samsung | KM428C64J-10 | 64K x 8 Bit CMOS Video RAM | |
| IC8 | Yamaha | YM2612 | frequency modulation synthesize | - |
| IC9/IC10 | - | |||
| IC11 | Voltage Regulator | - | ||
| IC12 | Sega | 315-5684 (Rohm BA6166FS) | SOUND NETWORK/HEADPHONE AMP | - |
| IC13 | Sanken | SKA2195D | RGB Encoder | - |
VA2.3 [PC BD MD2 VA2.3 USA][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68000FN12 | Processor | - |
| IC2 | Toshiba | TC511632FL-10 | 512K (32768 words X 16 bits) Pseudo-SRAM | - |
| IC3 | ? | ? | ? | - |
| IC4 | Zilog | Z84C0006FEC | Zilog Z80 8-bit coprocessor | - |
| IC5 | ? | XL J6265AF-10SL | - | |
| IC6 | Sega | 315-5786 (Toshiba T9N13BF) | VDP and IO chip all-in-one. Doesn't include the YM2612. Used on MD2 VA2 and VA2.3 board revisions. | - |
| IC7 | Toshiba | TC5281286J-80 | 1M (128K x 8-bit) VRAM | - |
| IC8 | Yamaha | YM2612 | frequency modulation synthesize | - |
| IC9 | SEGA | 315-5684 (Rohm BA6166FS) | SOUND NETWORK / HEADPHONE AMP | - |
| IC11 | Sony | CXA1645M | RGB Encoder | - |
| IC12 | ? | 7805 | +5V voltage regulator | - |
| IC13 | ? | 74HC14 | HEX SCHMITT-TRIGGER INVERTER | - |
VA3 [PC BD MD2 VA3 USA HAL][edit]
| List of IC's | ||||
|---|---|---|---|---|
| IC# | Brand | Name | Description | Documentation |
| IC1 | Motorola | MC68HC000FN8 | Processor | - |
| IC2 | Hitachi(?) | 651632DFP-15 | 512K (32K X 16-bits) Pseudo-SRAM | - |
| IC3 | ? | ? | ? | - |
| IC4 | Zilog | Z84C0006FEC | Zilog Z80 8-bit coprocessor | - |
| IC5 | ? | ? | 64K (8K x 8-bit) SRAM | - |
| IC6 | Sega | 315-5660 | VDP and IO chip all-in-one. | - |
| IC7 | OKI | M54C864-80 | 512K (64K x 8-bit) VRAM | - |
| IC8 | ? | ? | ? | - |
| IC9 | SEGA | 315-5684 (Rohm BA6166FS) | SOUND NETWORK / HEADPHONE AMP | - |
| IC10 | ? | ? | ? | - |
| IC11 | Samsung | KA2195D | RGB Encoder | - |
| IC12 | ? | 7805 | +5V Voltage Regulator | - |
Notes[edit]
Most of the time the main SEGA IC's are based on/renamed chips from other brands as follows:
- MD1 VA0, VA1, VA2, VA3, VA4, VA5, VA6, VA6.8
- Yamaha YM7101 / FC1001 = Sega 315-5313 / 315-5313A / 315-5313A-01
- MD1 VA7 & MD2 VA0, VA1, VA1.8, VA3
- Yamaha FC1004 = Sega 315-5487 / 315-5487-01 / 315-5487-10 / 315-5660 / 315-5660-02 / 315-5708 / 315-5708-01
- Sega Nomad & some MD2 VA3's
- Yamaha FF1004 = Sega 315-5700
- MD2 VA2, VA2.3
- Toshiba T9N13BF = Sega 315-5786
- Toshiba TC6158AF = ???
- MD2 VA4 & GEN3 VA1
- Yamaha FJ3002 = Sega 315-5960
- GEN3 VA2
- Yamaha FQ8007 = Sega 315-6123
