was used / (in its 8042 variant) in the original IBM PC keyboard. / Reportedly, most if not all IBM PC AT and PS/2 keyboards contain a variant of the 8049AH
The 8048 has a Modified Harvard architecture, {like a PIC} with internal or external program ROM and 64–256 bytes of internal (on-chip) RAM. The I/O is mapped into its own address space, separate from programs and data. / it remains quite popular, due to its low cost, wide availability, memory efficient one-byte instruction set, and mature development tools.

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