IN THE SHADOW OF THE 8051

摘要

I can recall making the "step up" to the eight-bit 8051 from the venerable eight-bit 8048 way back when dinosaurs still roamed the plains and valleys. I chose to use the 8748, which was equipped with a quartz window to allow erasure of the EPROM that held the 8748's program instructions. I soon outgrew the 8748's 1KB of program EPROM and migrated to its big brother -the 8749 — which contained 2KB of on-chip EPROM under the quartz window.