Radio Shack TRS-80 Model II Reference Manual page 59

Model II TRSDOS
R (Modify Registers)
Press to enter this command. The R
=
> prompt appears. Type in a letter
indicating which register-pair you want to change:
A for AF
X for IX
F for AF'
B for BC
Y for IY
C for Be'
D for DE
E for DE'
H for HL
L for HL'
The cursor will move over to the first byte of the register pair. While in the
register modify mode, use the cursor control keys
,[I
and
1::' 2
to move over one
nibble at a time. Use to advance to the next register pair.
To cancel changes in register contents, press
1m .
To effect changes made,
press
S (System)
Press to return to the
TRSDOS READY
mode. The debugger is still on;
when you load and execute a program, you will enter the debugger again.
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