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Section A:
System interface
************************************************************************
*
*
*
49 - Get
I
Set System Variables
*
*
*
************************************************************************
On entry:
c
DE
On return: HL
31H
Pointer to Parameters
Value of Requested System Variable
Possible logical errors:
- none -
Possible physical errors:
- none -
Differences to CP/M plus:
- none -
Differences to CP/M 2.2 resp. DiCOS:
New function.
Function
49
allows
for accessing the internal EOS
system
variables
1
area. DE points to an area with following parameters:
DB
DB
DW
OFFSET
CODE
VALUE
Address of variable relative to begin of area
Read
I
write flag
Byte or word for new value
The read/write flag may assume following values:
0FEH
0FFH
000H
Set byte
Read byte
Read value
All other values are reserved.
For the permitted values of OFFSET, refer to chapter
11
System Variables
11
•
WARNING: System variables may be read anytime, but careless writing to a
system variable will inevitably cause a system crash!
EOS System manual
Daeumling & Zimmermann
Page 88
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