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@idrougge
With VRAM I meant real VRAM: dual port RAM witch avoids bus contention.
The VRAM of early TMS chips was just SRAM or DRAM not dual ported.
According to Wikipedia VRAM was introduced in 86 and this is indeed when Jay Miner designed the successor of the OCS (that was never produced by Commodore) which was VRAM based. 86 is also the introduction year for the x68000 which was VRAM based. Megadrive is 88.
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