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From: greyelf@wpi.WPI.EDU (Michael J Pender)
Newsgroups: comp.sys.apple2
Subject: Hyperc (more questions)
Message-ID: <1990Oct22.215103.14790@wpi.WPI.EDU>
Date: 22 Oct 90 21:51:03 GMT
Sender: greyelf@wpi.WPI.EDU (Michael J Pender)
Organization: Worcester Polytechnic Institute
Lines: 106

1.      I'm working on interfacing graphics routines to Hyper C,
but I can't get the machine language routines to pass values back to
the calling routine.  Can somebody tell me why this doesn't work?  It
passes back the value of like one of the parameters sent to it instead?

If anyone is interested, I have all the other lo-res routines working,
and in a library.

	.nolist
sp	=	0xf4
sph	=	sp+1
fp	=	sp-2
fph	=	fp+1
pc	=	fp-2
pch	=	pc+1
r1	=	pc-2
r1h	=	r1+1
r2	=	r1-2
r2h	=	r2+1
r3	=	r2-2
r3h	=	r3+1
r4	=	r3-2
r4h	=	r4+1
jp	=	r4-2
jph	=	jp+1
smask	=	jp-2
smaskh	=	smask+1
dsply	=	smask-32
rp	=	dsply-2
	.list
    .even
    .entry  _scrn   ; char scrn(char x, char y);
_scrn:              ; Returns the color of the point indicated
    lda     #<2     ; Sets up to pass back an integer (2 bytes)
    ldy     #>2
    jsr     Alnk
    ldy     #4      ; get x
    lda     [sp],y  
    cmp     #40     ; is x value legal?
    bcs     _exitscrn
    sta     r2      ; preserve value
    ldy     #6      ; get y
    lda     [sp],y
    cmp     #48     ; is y value legal?
    ldy     r2      ; retrieve x value
    jsr     0xf871
    sta     r1      ; save color byte for return
    lda     #0
    sta     r1h     ; set high byte to zero

    lda	    #<-1
    tay
    jsr	    Asbfpn
    jsr     Alujp
_exitscrn:
    jmp     Artn

2.      I still have no clue how to call upon the printer for use within 
a program.  I'd love to see a code sample if possible.

3.      Any ideas on how to make an independent system file that could run
without all the associated files?

4.      I also want to use high resolution graphics, but invoking them
tends to eat the space the program occupies.  I thought perhaps I could 
use an anchored array in the space from 0x4000 - 0x6000 so that Hyperc
wouldn't try to use it for anything, but no luck.  Is there a way?
If so, where did I go wrong?

#include <std.h>
struct graphic_st
{
    unsigned int color : 1;
    unsigned int pixel : 7;
} plane[8192] @0x4000;

main(void)
{
    int i;
    char *j;
    j = 0xc057;     /* HGR on */
    i = *j;
    j = 0xc050;     /* TEXT off */
    i = *j;
    j = 0xc055      /* DP2 on */
    i = *j;

    for(i = 0 ; i < 8192; i++)
    {
        plane[i].color = 1;
        plane[i].pixel = (i % 128);
    }
    for(i = 1 ; i < 8192; i++)
        printf("%d ", plane[i]);
}


Please reply to me personally, I doubt this interests many people anymore.

Thanks.  Mike.

# N3
-- 
---
Michael J Pender Jr  Box 1942 c/o W.P.I.   Part of this D- belongs to 
greyelf@wpi.bitnet   100 Institute Rd.     God...