Editing Sega Mega Drive/Genesis Hardware

Sega Mega Drive Motherboard revisions
==Model 1==

===VA1 [IC BD M5 VA1]===
[[File:IC_BD_M5_VA1.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || -
|}

<br />
===VA2 [IC BD M5 USA VA2] 837-6992===
[[File:IC_BD_M5_USA_VA2.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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) ||  [http://en.wikipedia.org/wiki/Yamaha_YM2612 HERE]
|-
| IC12 || Sony || A1034(CXA1034P/M)|| Headphone amp || [http://www.datasheetcatalog.org/datasheet/sony/06800809.pdf HERE]
|-
| IC13 || Sony || CXA1145 || Video encoder || [http://pdf1.alldatasheet.com/datasheet-pdf/view/77343/SONY/CXA1145P.html HERE]
|-
| IC14 || Hitachi || HA17358 || dual operational amplifier || [http://www.datasheetcatalog.org/datasheet/HitachiSemiconductor/mXqyszx.pdf HERE]
|-
| IC15/IC17 || ? || 7805 || +5V Regulator || -
|-
| IC16 || Sega || 315-5345 (DIP16) || I/O chip || -
|}

<br />
===VA3 [IC BD M5 USA VA3] 837-7071===

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || Yamaha | |YM2612 || frequency modulation synthesizer || -
|-
| IC12 || Sony || CXA1034 || Headphone amp || -
|-
| IC13 || Sony || CXA1145P || RGB Encoder || -
|-
| IC14 || ? || LM358N ||Dual Operational Amplifier || -
|}

<br />
===VA4 [IC BD M5 PAL VA4]===

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || ? || ? || ? || -
|}

<br />
===VA5===
The only difference is the IC4 315-5402

<br />
===VA6 [IC BD M5 PAL]===
[[File:Genesis_pal_model1_M5.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || ? || ? || ? || -
|}

<br />
===VA6 [IC BD M5 USA VA6]===

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || -
|}

<br />
===VA6.8===

<br />
===VA7 [PC BD M5 USA VA7] 171-6217-11===
[[File:PC_BD_M5_USA_VA7.jpg|200px|center]]

The VA7 is almost a Genesis 2 PCB in a Genesis 1 case. It even shares the same PCB prefix (PC).

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || [http://pdf1.alldatasheet.com/datasheet-pdf/view/136263/HITACHI/HM65256BLFP-10T.html 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 || [http://cs.utsource.net/goods_files/pdf/12/122827_HITACHI_HM53461ZP-15.pdf HERE]
|-
| IC9/IC10 || Rohm || BA10324AF || Op-amp || [http://www.datasheetcatalog.org/datasheets/70/233206_DS.pdf HERE]
|-
| IC11 || SONY || CXA1145M || Video || -
|-
| IC12 || Toshiba || TA7805S || +5V Voltage regulator || -
|}


{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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
|}
[[Category:Sega Genesis]]
[[Category:Hardware]]

==Model 2==
===VA0 PAL===

<br />

===VA1 [PC BD MD2 VA1 USA]===
[[File:Model2_va1_motherboard.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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) ||  [http://pdf1.alldatasheet.com/datasheet-pdf/view/77344/SONY/CXA1145M.html HERE]
|-
| IC12 || ? || ? || Voltage regulator || -
|}

<br />

===VA1 ASIA===

<br />

===VA1.8 [PC BD MD2 VA1.8 USA]===
[[File:PC_BD_MD2_VA1.8_USA.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || [http://elcodis.com/parts/6023884/MB3514.html#datasheet HERE]
|-
| IC12 || ? || 7805 || +5V Voltage regulator || -
|}

<br />

===VA1.8 [PC BD MD2 VA1.8 PAL]===
[[File:Genesis_pal_model2_VA1.8.jpg||200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 ||  [http://elcodis.com/parts/6023884/MB3514.html#datasheet HERE]
|-
| IC12 || ? || 7805 || +5V Voltage regulator || -
|}

<br />

===VA1.8 [PC BD MD2 VA1.8 ASIA]===
[[File:PC_BD_MD2_VA1.8_ASIA.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || -
|}

<br />

===VA2 [PC BD MD2 VA2 USA]===

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|List of IC's
|-
! IC# !! Brand !! Name !! Description !! Documentation
|-
| IC1 || Motorola || MC68HC000FN12 || Processor || <center>-</center>
|-
| 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 || <center>-</center>
|-
| IC8 || Yamaha || YM2612 || frequency modulation synthesize || -
|-
| IC9/IC10 || || || || -
|-
| IC11 || || || Voltage Regulator || style="text-align: center;"| -
|-
| IC12 || Sega || 315-5684 (Rohm BA6166FS) || SOUND NETWORK/HEADPHONE AMP || -
|-
| IC13 || Sanken || SKA2195D || RGB Encoder || -
|}

<br />

===VA2.3 PC BD MD2 VA2.3 USA===

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || -
|}

<br />

===VA3 [PC BD MD2 VA3 USA HAL]===
[[File:PC_BD_MD2_VA3_USA_HAL.jpg|200px|center]]

{| class="mw-collapsible mw-collapsed wikitable" style="width: 600px;" style="text-align: center;"
! colspan=5 width="600"|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 || -
|}

<br />

===VA4===

==Model 3==
===VA1===
===VA2===


==Notes==

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

==See Also==
*[[Sega Genesis]]
*[[Sega Genesis Cartridge]]
[[Category:Sega Genesis]]
[[Category:Hardware]]