Little special hardware on those old macs, memory was 16-bits, framebuffer was part of memory (memory was expensive), no blitting hardware, no hardware cursors

Little special hardware on those old macs, memory was 16-bits, framebuffer was part of memory (memory was expensive), no blitting hardware, no hardware cursors (software removed the cursor, rendered to the screen, copied the data under the cursor and restored it). Screen refresh also refreshed memory, during horizontal blanking it fetched audio data