This page is used to document details of the hardware for the Sega Mega Drive/Genesis.
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 |
? |
? |
? |
-
|
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 |
-
|
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
- Yamaha FF1004 = Sega 315-5700
- Toshiba T9N13BF = Sega 315-5786
- Toshiba TC6158AF = ???
- Yamaha FJ3002 = Sega 315-5960
- Yamaha FQ8007 = Sega 315-6123
See also[edit]
