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 for Intel 8048
From The Free On-line Dictionary of Computing (30 December 2018) :

  Intel 8048
      The microcontroller used in IBM PC keyboards.
     The 8048 was inspired by, and similar to, the Fairchild F8
     microprocessor but, being a microcontroller, was designed for
     low cost and small size.  The 8048 has a modified Harvard
     architecture, with program ROM on chip and 64 to 256 bytes
     of RAM also on chip.  I/O is mapped in its own address
     Though the 8048 was eventually replaced by the very popular
     but bizarre Intel 8051 and Intel 8052, even in 2000 it is
     still very popular due to its low cost, wide availability, and
     development tools.
     [Was it really __the_first__ microcontroller?  Are the ROM and
     RAM both on-chip?]

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