Radio Shack TRS-80 Model 4 - Page 61

turns off standard or extended DEBUG.
DEBUG (OFF tE)<T) (ENTER)
Turns off DEBUG and attempts to reclaim the high memory occupied
by the extended debugger. (If anything is loaded in high memory
below the extended debugger, this area is not reclaimed.)
To enter the monitor when DEBUG is on, type:
f i 1 e 5 Pe C (ENTER)
TRSDOS loads the program (as long as the file's protection level is
not execute only) and transfers control to DEBUG. (You can also
enter the monitor by pressing (BREAK).)
Following is a sample display of the debugger screen.
af = 01 93 S--H--NC
be = 01 07 = FC IB 13 06 2D 06 23 06
d. = 02 08 =l 05 68 08 00 00 00 4B 49
hi = 0A 00 => FF 19 19 2D 2D 20 2D 2D
af'= FF FF SZIHIPNC
be'= 00 10 =) C9 00 00 FF 00 FF 00 FF
de' = 4A B1 => 03 20 20 20 20 20 20 20
hi' = 40 92 => F7 4E 64 69 72 2F 73 79
1X = 02 08 =) 05 68 08 00 00 00 4B 49
i. = 00 6A => 00 00 04 02 00 00 00 00
30
06 0E
06
28
06
7B 19
• ••• - • #.
0 ••• (. {.
07
60 0B
00
00
00 44
4F
• h •••• KI
.@ .... DO
2D
20 20
2D
20
2D 0A
0A
C9
00 00
81
FF
FF FF
2F
..... .. I
20
20
20 20
20
20 20
20
73
2C
33 32 00 FF 00
FF
• Nd i r / 5 Y
S f 32 ....
07
60
0B 00 00 00 44
4F
• h .... KI
.@ .... 00
/-~
00 M
05
00
78
00 87
00 •••• x •••
SP = 03 EA => 88 08 50 06 08 02 20 04 4A 2B 4F 4F 16067805 .. P .... J+OO .. x.
= 08 EI =l 38 07 28 05 79 FE 03 28 6A E5 23 7D 23 BE 28 20 8,(, ••• ( o.#}#.(
FF00 => 20 20 20 20 20 2D 20 ZD 20 20 20 20 2D 20 2D 20 --------
FF10 =) 20 20 20 20 2D 20 20 20 20 20 20 20 20 20 20 20 --------
FF20 => 20 20 20 ZO 20 20 20 20 20 20 20 20 20 20 2D 20 --------
FF30 => 20 20 20 20 20 20 2D 20 2D 20 20 20 2D 20 20 20 --------
The debug display contains information about the Z-80
microprocessor registers. The display is set up in the following
manner:
The register pairs are shown along the left side of the display,
from top to bottom. The current contents of each register pair are
shown immediately to the right of the register labels.
The AF and AF' pairs are followed by the current status of the
flag registers to the right of the register contents. The other
register pairs are followed by the contents of the 16 bytes of
memory they are pointing to. The contents are shown in both
hexadecimal and ASCII representations. Non-displayable ASCII
characters are represented by periods.
The PC register shows the memory address of the next
instruction to be executed. The display to the right of that
address shows the contents of that address and the next 15
addresses.
1-56