System information

It is emphasized that the physical device names might not actually correspond to devices that the
names imply. That is, you can implement the PTP: device as a cassette write operation. The exact
correspondence and driving subroutine is defined in the BIOS portion of CP/M. In the standard
distribution version of CP/M, these devices correspond to their names on the MDS 800
development system.
The command,
STAT VAL:
produces a summary of the available status commands, resulting in the output:
Temp R/O Disk d:$R/O
Set Indicator: filename.typ $R/O $R/W $SYS $DIR
Disk Status: DSK: d:DSK
Iobyte Assign:
which gives an instant summary of the possible STAT commands and shows the permissible
logical-to-physical device assignments:
CON:=TTY:CRT:BAT:UCI:
RDR:=TTY:PTR:URI:UR2:
PUN:=TTY:PTP:UP1:UP2:
LST:=TTY:CRT:LPT:ULI:
The logical device to the left takes any of the four physical assignments shown to the right. The
current logical-to-physical mapping is displayed by typing the command:
STAT DEV:
This command produces a list of each logical device to the left and the current corresponding
physical device to the right. For example, the list might appear as follows:
CON:=CRT:
RDR:=URl:
PUN:=PTP:
LST:=TTY:
1.6 Transient Commands CP/M Operating System Manual
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