[Coco] Assembly help: Corrupted bin file ?

[Fedor Steeman]

Thanks Roger.

So, how do I code a multi-segment source file in assembly? Do I just use
multiple origin statements? Like:

             ORG    $2000
START   NOP
             NOP
END START
             ORG    $7000
STRT2   NOP
             NOP
END STRT2

Cheers,
Fedor

2008/12/18 Roger Taylor <operator at coco3.com>


> At 01:30 AM 12/17/2008, you wrote:

>

>> Hello everyone,

>>

>> I am still trying to learn assembly language but keep on running into

>> problems.

>>

>> I have been trying to have the following source code assembled:

>>

>> VIDRAM  EQU     $0400     *Start of Video Display location

>> V0CLR   EQU     $FFC0        *Clear bit for Sam Chip (Graphics mode)

>> V1SET   EQU     $FFC3        *Set V1 bit in Sam Chip (Graphics mode)

>> V2SET   EQU     $FFC5        *set V2 bit in Sam Chip (Graphics mode)

>> VOFSET  EQU     $FFC6       *Display Offset Binary, This is the CLR Bit

>> (Video page offset)

>> VDGSET  EQU     $FF22        *PIA1 data port B: VDG Control output

>> POLCAT  EQU     $A000        *Color Basic rom poll keyboard routine

>>

>>        ORG     $21FD

>>        LDX     #VIDRAM   *331D: 8E 04 00

>>        LDD     $AAAA     *3320: CC AA AA

>> Z3323   STD     ,X++      *3323: ED 81

>>        CMPX    #$1C00    *3325: 8C 1C 00

>>        BCS     Z3323     *3328: 25 F9

>>        NOP               *332A: 12

>> PMODE4  STA     V0CLR     *2787: B7 FF C0

>>        STA     V1SET     *278A: B7 FF C3

>>        STA     V2SET     *278D: B7 FF C5

>>        LDA     #$F8      *2790: 86 F8

>>        STA     VDGSET    *2792: B7 FF 22

>>        STA     VOFSET    *2795: B7 FF C6

>>        JSR     [POLCAT]  *332E: AD 9F A0 00

>>        RTS               *3332:

>>

>

>

> The source code above is missing two things:

> the label of the starting line/address

>

> try:

> EXEC   LDX #VIDRAM

>

> and the LOADM/EXEC finalizer is missing

> the last line of the source code should be:

>

>   END  EXEC

>

> Now when you LOADM the program from BASIC, all you have to do is type EXEC

> No address is needed as in EXEC #####.

> If you just used END without an address, you'd have to type EXEC $21FD from

> BASIC to run the program.

>

>

>

> --

> Roger Taylor

>

> http://www.wordofthedayonline.com

>

>

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