Re: Apple II Interger ROMs

["Michael J. Mahon" <mjmahon@aol.com>]

John B. Matthews wrote:
> In article <da5s0j$21jv$1@merope.saaf.se>,
>  pausch@saaf.se (Paul Schlyter) wrote:
>
>
> > In article <1gz2ljo.1jomls212ieqmoN%dempson@actrix.gen.nz>,
> > David Empson <dempson@actrix.gen.nz> wrote:
>
> [...]
>
> > > I don't know what Apple included in this area in the INTBASIC image on
> > > DOS 3.3.
> >
> > It contained this:
> >
> > D800: B8 90 02 E6 B9 24 F2 10 14 A6 76 E8 F0 0F A9 23  8..f9$r..&vhp.)#
> > D810: 20 5C DB A6 75 A5 76 20 24 ED 20 57 DB 20 B1 00   \[&u%v $m W[ 1.
> > D820: 20 28 D8 4C D2 D7 F0 62 F0 2D E9 80 90 11 C9 40   (XLRWpbp-i...I@
> > In disassembly format the contents was as listed below.  It's clearly
> > code of some kind.  Anyone recognize what it is?
> > [...]
> > D801-   90 02       BCC   $D805
> > D803-   E6 B9       INC   $B9    inc textptr
> > D805-   24 F2       BIT   $F2    is trace on
> > D807-   10 14       BPL   $D81D  no
> > D809-   A6 76       LDX   $76    are we running? 
> > D80B-   E8          INX
> > D80C-   F0 0F       BEQ   $D81D
> > D80E-   A9 23       LDA   #$23   '#'
> > D810-   20 5C DB    JSR   $DB5C  jsr outdo
> > D813-   A6 75       LDX   $75    curlin
> > D815-   A5 76       LDA   $76    curlin+1
> > D817-   20 24 ED    JSR   $ED24  jsr linprt
> > D81A-   20 57 DB    JSR   $DB57  jsr outsp
> > D81D-   20 B1 00    JSR   $00B1  jsr chrget
> > D820-   20 28 D8    JSR   $D828  jsr execute
> > D823-   4C D2 D7    JMP   $D7D2  back for more
>
>
> Why, it's a big chunk of Applesoft!

So, I'm guessing that they made the INTBASIC file by BLOADing the
FPBASIC file and then loading the specifically Integer BASIC parts
over it.  Any space not explicitly reloaded remains FPBASIC.

-michael

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