Yes! I definitely also saw this one long time ago. Most likely my "independent" idea from post above was my brain just re creating this very product from memory

Yes! I definitely also saw this one long time ago. Most likely my "independent" idea from post above was my brain just re creating this very product from memory :] GAL, few TTLs, SRAM? and a DAC, easy and cheap to manufacture and obvious once you saw IMS G171 being released in 1986 (year before vga). Another missed opportunity by Commodore, A500 should have had a socket for INMOS G171 right on the motherboard in 1987, maybe even a flap on top of the case for easy upgrade access. Today $10 RP2040 pico board and a resistor ladder can implement it easily.