HD404638R microcomputer equivalent, 4-bit single-chip microcomputer.
* 8,192-word × 10-bit ROM (HD404638R, HD40A4638R)
* 16,384-word × 10-bit ROM (HD404639R, HD40A4639R, HD407A4639R)
* 1,152-digit × 4-bit RAM
* 61 I/O pins .
The HD404639R Series is a member of the HMCS400-series microcomputers designed to increase program productivity with large-capacity memory. The HD404639R Series, completely compatible with the HD404639 Series, reduces current dissipation in half and .
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