Io And Ram Instructions

This section describes instructions which access DATA RAM characters or perform input or output operations. One instruction, WPM, allows the programmer to read or write 8-bit program RAM locations. These instructions use addresses selected by the DCL and SRC instructions.

Instructions in this class occupy one byte as follows:

Code	Description
WRM	Write accumulator to RAM.
WMP	Write accumulator to RAM output port
WRR	Write accumulator to ROM output port.
WPM	Write accumulator to Program RAM.
WRn	Write accumulator to RAM status char&cter n (n = 0, 1, 2 or 3).
RDM	Load accumulator from RAM.
RDR	Load accumulator from ROM input port.
RDn	Load accumulator from RAM status character n (n = 0, 1, 2 or 3) .
ADM	Add RAM data plus carry to accumulator.
SBM	Subtract RAM data from accumulator with borrow.