OKI MSM54C864

Video RAM Sega Mega Drive II (Model 2) VA1 — PAL · Mega Drive II

64K × 8 multiport (dual-port) DRAM: the 64 KB video RAM used by the VDP inside the 315-5660.

Find datasheet

IC6 OP1

Other components on Sega Mega Drive II (Model 2) VA1 — PAL

CART1 ENC1 IC1 IC4 IC5 IC6 IC7 OP1 OP2 OSC1 REG1 WRAM

About this component

Holds the tile patterns, name tables and sprite table that the VDP draws from. Model 2 VA1 boards replaced the two VRAM chips of the VA0 with this single 64 KB part. Faulty VRAM usually shows as corrupted or missing graphics, garbled tiles, or a blank screen with sound still playing. Sources: https://consolemods.org/wiki/Genesis:Motherboard_Differences , https://www.copetti.org/writings/consoles/mega-drive-genesis/

Pinout & readings

No pinout or reference readings yet — these show what each pin does and what a healthy part should measure.