[Coco] Assembly help: Corrupted bin file ?

[William Astle]

Art Flexser wrote:
> You use multiple ORG statements, but there can be only one exec address for the
> binary file.  You've specified two of them in your example.  (I'd assume most
> assemblers would replace the first exec address ($2000) when the second ($7000)
> is encountered.)  Use just a single END specifier to let the assembler know the
> exec address for the binary.

Actually, a lot of assemblers will stop assembly completely at the first
END statement encountered. Hence the name "END".

> 
> Art
> 
> On Thu, 18 Dec 2008, Fedor Steeman wrote:
> 
>> 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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> 
> 
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