MOSTLY YES! But there was also some odd-ball hardware that was 16-bit transfers instead of 8-bit. So to draw a single pixel, you had to read two bytes, replace one, then write two bytes back. HOWEVER though, this also meant that just raw performance of painting was twice as fast, as you could draw two pixels in a single operation, if you already knew what both were going to be! (like copying frame buffer for example)
For those who get a kick out of wrangling old hardware to do things it was never designed to.. this back in 2015 blew me away when I found it: int10h.org/blog/2015/04/cga-in-102...
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