[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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>>

> 

> 

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