Cpu - Teac MT-20D-IO Maintenance Manual

3-5-1 CPU
The microprocessor 80C85A is used as the
cpu.
The CPU controls the opera-
tion of each LSI within MTC. it also controls directly the moving system
and write system signals GO, FWD, HIS WEN, and EEN, etc. with respect to CMT
via the ouptut port, or monitors the output signals CLD, FPT, and HaL, etc.
from CMT via the input port, and feeds them back to the tape motion control.
While, as for the data system, the CPU generates a data block by adding a
header (such as track No. and block address) to the data received from the
HOST during write opeeration, or generates File Mark and control block, and
controls Rewrite, etc. during error occurrence. During read operation, it
also checks the header, and identifies the data block, file mark block and
control block, and then transfers only the data part of the data block to
the HOST.
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