hotkey, The Thomson TO7 came before the MO5. Whereas the MO5 had a gate array for video, the first TO7s did it all with discrete logic.
Also two IO chips, why? Well, they wanted a timer (for flashing the cursor and tape IO).
They also needed extra ROM because the OS didn't fit in 4KB.The MC6846 PIO chip has 2KB of ROM. It was designed for "2-chip computers" e.g. CPU + MC6846 (ROM + IO + Timer)
So 6KB ROM. Not enough for BASIC. So put it on a cartridge.
Or how about LOGO?
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