Basic Disk Operating System (BDOS) Functions
4-30
CHAIN
TO
PROGRAM
ENTRY
RETURN
CL:
2FH
FUNCTION
47
DMA
buffer:
Command
Line
CHAIN
TO
PROGRAM
The
Chain
to
Program
function provides a means
of
chaining from one
program
to
the
next without operator intervention. Although there
is
no passed
parameter
for
this call, the calling process must place a
command
line terminated by a null byte in
the default
DMA
buffer.
Under
CP
1M
-86 the Chain
to
Program function releases the memory
of
the calling
function before executing the command. The
command
line
is
parsed
and
placed in
the
Base Page
of
the new program. The Console
Command
Processor (CCP) then
executes the command line.
GET
SYSTEM
DATA
AREA
ADDRESS
ENTRY
CL: 031H
FUNCTION
49
GETSYSDAT
ADDRESS
RETURN
BX:
SYSDAT Address
Offset
ES: SYSDA
T Address
Segment
The
GET
SYSDA T function returns the address
of
the System
Data
Area. The
system
data
area includes the following information.
dmaad
equ word
ptr
0
;user
DMA
address
dmabase equ word
ptr
2
;user
DMA
base
curdsk equ byte
ptr
4
;current user disk
usr code
equ byte
ptr
5
;current user
number
control_p_flag
equ byte
ptr
22
;listing toggle
...
;set by ctrl-p
console _ width
equ byte
ptr
64
printer _ width
equ byte
ptr
65
console_column
equ
byte
ptr
66
printer _column
equ byte
ptr
67
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