Radio Shack TRS-80 Model III - Page 16

ODEL II OPERATION
ROM (~he(;ksum E~rro]r. Defec:tive ROM.
address range
PI PIO Chip Failure.
OM
MB RAM Fault. Defective RAM in address range
X'OOOO' -X 'OFFF ,
MH RAM Fault (on 64K systems only). Defective
RAM in address range X'8000'-X'FFFF'
81 SIO Chip Failure.
Before you ask for help ...
Try the operation several times. Try using other diskettes. Recheck to see
that all power and interconnections are right.
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