Building for CPM

[StephanSchmidt]

I want to use wla-dx to develop a game for CP/M.

CP/M programs are z80 code and need to start at $0100.

When I use the following code, I can generate and run (hurray!) binaries on CP/M. As wla-dx is designed for rom banks, the file is filled up with zeros.

How can I generate binaries that are only as large as the code and not filled up with zeros?

(The memorymap, rombankmap etc. are copied and pasted from the example and make no sense for CP/M but work).

.MEMORYMAP
SLOTSIZE $4000
DEFAULTSLOT 0
SLOT 0 $0100
.ENDME

.ROMBANKMAP
BANKSTOTAL 2
BANKSIZE $4000
BANKS 2
.ENDRO

      .define bdos 5

        .orga 100h                                                                
start:  nop
     nop
    ld      de,msg                                                          
        ld      c,9                                                             
        call    bdos                                                            
     ret
msg:    .db    "Hello,world!",0dh,0ah,"$"      

[vhelin]

You need to run WLALINK in program output mode (-b):

wlalink.exe -b -S linkfile output.prg

Also you need .MEMORYMAP and .ROMBANKMAP to be correct. .ROMBANKMAP in this case is just used as a placeholder for the assembler as internally it works with rombanks... But if your current setup works, then it'll work. :)

PS. This seems to make the program start at $0 even if I use "-bS $100"... This is what you want to see:

$ ../binaries/wlalink.exe -b -S linkfile output.prg Program start $100, end $119.

I'll check out what's wrong...

[vhelin]

Ah, this .MEMORYMAP works better:

.MEMORYMAP SLOTSIZE $4000 DEFAULTSLOT 0 SLOT 0 $0000 .ENDME

With this you get

$ ../binaries/wlalink.exe -b -S linkfile output.prg Program start $100, end $119.

and in output.sym you'll see that label start is at $100...

[labels] 00:0100 start 00:010b msg

[StephanSchmidt]

Excellent, thanks works! Also thanks for the fast turnaround.