RMX/SO BASIC-SO
F-16
Altering BASIC-80 Workspace
The BASIC-80 work.space stores the current BASIC-80 program, variables, con-
stants, file buffers, strings.
It
should be as large as
is
practical.
Table
F -2.
Sample
Configuration
Memory
Requirements
Module PROM (bytes)
RAM
(bytes)
RMXBAS.LlB
22287
1415
BOOTCM.OBJ
87
197
BASCM.OBJ
151
538
BOMEM.OBJ
18
Note 1
BOBMEM.OBJ
Note 1: BQMEM.ASM allocates
DFS
memory areas and the BASIC-80
workspace.
DFS
requires
700
bytes, plus
400
bytes
per
DFS
file. An additional
80
bytes are required
for
the controller stack on a non-boot loaded
DFS
system.
On
a boot loaded system, BQBMEM.ASM allocates controller stack
area.
The BQMEM.ASM module contains two labels: BQSMEM and BQEMEM. These
labels correspond to the starting and ending addresses
of
the BASIC-80 workspace.
The distributed code
is
written to make the greatest possible area
of
memory
available as workspace:
• BQMEM.OBJ
is
the last module linked, so the starting address
of
the
workspace
is
at
the top
of
all data areas. BQSMEM uses this address.
• ASEG and ORO force the controller addressable areas (if DFS
is
specified) and
boot loader code (in a
boot
loaded system) to the top
of
memory. A variable
FREE addresses the last free byte below these. FREE
is
used by BQMEM. Note:
the
boot
loader work area RQPOOL
is
re-used by BASIC-80.
If
you wish
to
fix
the BASIC-80 work area to a specific length
or
location,
BQSMEM and BQEMEM must be modified accordingly.
If
you want to reserve free
memory for BASIC-80 to POKE data into, you need to know the address loaded
by
BQMEM. This can be determined by examining the code of BQMEM in
BQMEM.ASM. In the distributed version, this address
is
OFI23H. Accordingly, to
reserve
1500
bytes
of
string space and
lK
bytes to POKE into, the command
CLEAR
1500,OF123H
1024
should be given.
If
you give this command, the memory between OED24H and
OF123H
will be unused and available to BASIC-80.
Burning a BASIC-80 Program Into PROM
To burn a BASIC-80 program into a programmable read-only memory (PROM),
you must first convert the BASIC-80 program to Intel relocatable object file for-
mat. Included with BASIC-80
is
a program that does this conversion.
These are the steps required to burn a BASIC-80 program into PROM:
1.
Save the program
on
disk in ASCII format (the A option
of
the SAVE
command). This can be done with either
RMX/80
or ISIS-II BASIC-80.
2. Convert the ASCII program file to a relocatable object file with BAPROM.
3.
Convert the file to absolute object file format with LOCATE.
4. Read the converted object file into PROM using the UPM READ command
with the OBJECT option.
5. Burn the file into PROM with the PROGRAM command.
BASIC-SO