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→Model 1
Sega Mega Drive Motherboard revisions
==Model 1==
===NTSC Model 1 VA2===
Board label: IC BD M5 USA VA2
{| border="1"
|+NTSC Model 1 VA7 IC's
|-
| IC# || Brand || Name || Description || Documentation
|-
| IC1 || Signetics || SCN68000C8N64 || 8MHz Processor || <center>-</center>
|-
| IC2/IC3 || Toshiba || TC51832SPL-12 || CMOS 256K (32K x 8) Pseudo-SRAM, 12ns || <center>-</center>
|-
| IC4 || SEGA || 315-5308 || I/O chip || <center>-</center>
|-
| IC5 || SEGA || 315-5309 || I/O chip || <center>-</center>
|-
| IC6 || Zilog || Z0840004PSC || Zilog Z80 8-bit coprocessor || <center>-</center>
|-
| IC7 || NEC || D4168C-15 || 8,192 x 8-BIT NMOS XRAM, 150 ns || style="text-align: center;"| -
|-
| IC8 || SEGA ||
315-5313 (Yamaha YM7101) || VDP || <center>-</center>
|-
| IC9/IC10 || ? || ? || ? || <center>-</center>
|-
| IC11 || Yamaha || YM2612 || frequency modulation synthesizer || <center>-</center>
|}
===NTSC Model 1 VA7===
[[File:PC_BD_M5_USA_VA7.jpg|thumb|150px|NTSC Model 1 VA7]]
| IC14 || ? || ? || ? || <center>-</center>
|}
==Model 2==
