Sega Mega Drive/Genesis Hardware
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Sega Mega Drive Motherboard revisions
Contents
Model 1
M5 PAL
Board label: IC BD M5 PAL
IC# | Brand | Name | Description | Documentation |
IC1 | Hitachi | HD68HC000P8 | 8MHz Processor | |
IC2/IC3 | Motorola | MCM51L832ASP10 | CMOS 1024 BIT SRAM | |
IC4 | SEGA | 315-5433 | ? | |
IC5 | SEGA | 315-5313A | ? | |
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 | ? | ? | ? |
VA1
Board label: IC BD M5 VA1
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 NTSC
Board label: IC BD M5 USA VA2
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 | 8,192 x 8-BIT NMOS XRAM, 150 ns | - |
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 | Sony | CXA1145 | Video encoder | |
IC14 | ? | ? | ? | |
IC15 | ? | ? | ? | |
IC16 | Sega | 315-5345 (DIP16) | I/O chip |
VA3
VA4 PAL
Board label: IC BD M5 PAL VA4
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
VA6
VA6.8
VA7 NTSC
Board label: PC BD M5 USA VA7
IC# | Brand | Name | Description | Documentation |
IC1 | Motorola | MC68HC000FN8 | Processor | |
IC2/IC3 | Sharp | LH5P832N-12 | CMOS 256K (32K x 8) Pseudo-Static RAM | |
IC4 | Zilog | Z0840004PSC | Zilog Z80 8-bit coprocessor | |
IC5 | Sanyo | LC3564PM | 64K (8192 words x 8 bits) 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 | |
IC11 | SONY | CXA1145M | Video | |
IC12 | ? | TA7805S | Voltage regulator |
Model 2
VA0 PAL
VA1 NTSC
Board label: PC BD MD2 VA1 USA
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 ASIA
VA1.8 NTSC
VA1.8 PAL
Board label: PC BD MD2 VA1.8 PAL
IC# | Brand | Name | Description | Documentation |
IC1 | Motorola | MC68HC000FN8 | Processor | |
IC2 | ? | 651632DFP-15 | SOP 40W | |
IC3 | ? | ? | ? | |
IC4 | Zilog | Z84C0006FEC | Zilog Z80 8-bit coprocessor | |
IC5 | ? | ? | ? | |
IC6 | SEGA | 315-5660 | ? | |
IC7 | Hitachi | HM53861J-8 | RAM chip | |
IC8 | ? | ? | ? | |
IC9/IC10 | Rohm | BA10324AF | ground sense quad op-amp | |
IC11 | Fujitsu | MB3514 | RGB Encoder | HERE |
IC12 | ? | ? | Voltage regulator |