[Coco] Assembly .BIN -> .CCC/.ROM = SOLVED!
Arthur Flexser
flexser at fiu.edu
Fri Sep 5 14:23:23 EDT 2014
On Fri, Sep 5, 2014 at 8:03 AM, Chad H <chadbh74 at hotmail.com> wrote:
> Does that put a hex FF at the end?
>
Well, no, but where the binary goes should be pretty clear without it, just
by looking for the bytes that comprise the final instruction of your
program. Besides, an $FF byte occurs so frequently in "empty" memory as to
not be a reliable flag anyway.
Art
> On Sep 5, 2014 2:29 AM, Arthur Flexser <flexser at fiu.edu> wrote:
> Why not just BINLOD EQU * at the end?
>
> Art
>
>
> On Thu, Sep 4, 2014 at 7:07 PM, Chad H <chadbh74 at hotmail.com> wrote:
>
> > I have no intention of ever relocating the assembly code. The FCB 255
> > just marks for me in the compiled .CCC file where I need to start merging
> > in the .BIN file. The FF is overwritten by the first byte of the .BIN.
> >
> > This is a 'bootloader' for .BIN files. The code and .BIN are merged then
> > flashed to rompak. It performs a kind of LOADM:EXEC on boot.
> >
> > On Sep 4, 2014 3:22 PM, Tormod Volden <lists.tormod at gmail.com> wrote:
> > On Thu, Sep 4, 2014 at 4:31 PM, Johann Klasek wrote:
> > > Putting altogether:
> > >
> > > org 49152 CoCo and compatibles map in ROM Paks
> here
> > >
> > > * LOADER
> > > BININ LDX #BINLOD INIT XFER DATA ADDRESS OFFSET
> > > CHKBLK LDA ,X+ GET BLOCK TYPE BYTE (00 = PREAMBLE,
> > 255=POSTAMBLE)
> > > BNE ENDBIN IF <>0 THEN MUST BE END OF .BIN DATA
> > (POSTAMBLE)
> > > LDY ,X++ GET BLOCK LENGTH(Y)
> > > LDU ,X++ GET BLOCK START ADDRESS(U)
> > > XFER LDA ,X+ GET SOURCE BYTE(A) FROM X
> > > STA ,U+ PUT BYTE(A) AT U
> > > LEAY -1,Y MOVED BLOCK?
> > > BNE XFER NO
> > > BRA CHKBLK CHECK NEXT BLOCK
> > > ENDBIN JMP [2,X] SKIP BLOCK LENGTH (0000)
> > > AND JUMP TO EXECUTION ADDRESS
> > > BINLOD FCB 255
> > >
> > >
> > > Anything wrong with this?
> >
> > Why the FCB at the end, anyway?
> >
> > If you want to keep it relocatable you should use LEAX BINLOAD,PCR
> >
> > Tormod
> >
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