Hardware Reference
In-Depth Information
Parameter
Meaning
A list of data bytes, ASCII characters (which must be enclosed in single quotes), or strings
(which must be enclosed in double quotes). The following examples are all acceptable data lists:
list
C,2F,C2,00,10
'A',':','/'
"Insert disk and press ENTER"
A port address. The following are acceptable examples of port addresses:
E
(the DMA controller)
30C
(within the prototype range)
378
(the parallel printer)
(see page 31 for more information).
port
A range of addresses which may be expressed as an address and offset (e.g. CS:100,100) or
as an address followed by a size (e.g.
DS:100 L 20
).
range
A register name (see (d)). The following are acceptable examples of register names:
regname
AX
DS
IP
A hexadecimal value in the range 0 to FFFF.
value
(d)
The following register and flag names are used within debug:
16-bit General-Purpose Registers
AX, BX, CX, DX
Code, Data, Extra, and Stack Segment Registers
CS, DS, ES, SS
Stack, Base, and Instruction Pointers
SP, BP, IP
Source and Destination Index Registers
SI, DI
Flag Register
F
(e)
The following abbreviations are used to denote the state of the flags in conjunction with the Register (R) and
Trace (T) commands:
Flag
Abbreviation
Meaning/status
Overflow
Overflow
OV
No overflow
NV
Carry
Carry
CY
No carry
NC
Zero
Zero
ZR
Non-zero
NZ
Direction
Down
DN
Up
UP
Interrupt
Interrupts enabled
EI
Interrupts disabled
DI
Parity
Parity even
PE
Parity odd
(
continued
)
PO
