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Old 15 December 2014, 19:57   #1
algorithm
 
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ADF Utilities on Windows to read/write tracks/bootloader

I have set up my amiga dev environment in order to use VASM to assemble on PC and to output the test executable to a shared directory in winuae.

The demo that I will be working on will be a trackloader and wanted to find out whether or not there are any windows tools to inject data to an ADF file into the relevant track/sector and to write/checksum the bootblock

I am aware of amiga tools that allow this (DD was the one I was using previously) and I can put together a quick ADF writer myself, (and I have looked at many other places) but could not find any? Any thing like this released as a windows binary?
 
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Old 16 December 2014, 11:34   #2
phx
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Location: Herford / Germany
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Quote:
Originally Posted by algorithm View Post
The demo that I will be working on will be a trackloader and wanted to find out whether or not there are any windows tools to inject data to an ADF file into the relevant track/sector and to write/checksum the bootblock
I don't know about Windows tools, but you could compile a portable C source for Windows, which performs this task.

For example makeimage.c from SolidGold:
Code:
/*
 * Makes a disk image of 901120 (0xdc000) bytes.
 * Calculates boot block checksum.
 *
 * Written by Frank Wille in 2013.
 *
 * I, the copyright holder of this work, hereby release it into the
 * public domain. This applies worldwide.
 */

#include <stdio.h>
#include <string.h>
#include <stdint.h>

#define DISKSIZE (0xdc000)

uint8_t image[DISKSIZE];


static void boot_chksum(uint8_t *p)
{
  uint32_t oldchk,chk=0;
  int i;

  memset(p+4,0,4);
  for (i=0; i<1024; i+=4) {
    oldchk = chk;
    chk += ((uint32_t)p[i+0] << 24) | ((uint32_t)p[i+1] << 16) |
           ((uint32_t)p[i+2] << 8) | p[i+3];
    if (chk < oldchk)
      ++chk;  /* carry */
  }

  chk = ~chk;
  p[4] = (uint8_t)((chk >> 24) & 0xff);
  p[5] = (uint8_t)((chk >> 16) & 0xff);
  p[6] = (uint8_t)((chk >> 8) & 0xff);
  p[7] = (uint8_t)(chk & 0xff);
}


int main(int argc,char *argv[])
{
  FILE *f;
  int rc = 1;
  size_t len;

  if (argc == 2) {
    if (f = fopen(argv[1],"rb")) {
      len = fread(image,1,DISKSIZE,f);
      if (len > 0) {
        if (len < DISKSIZE)
          memset(image+len,0,DISKSIZE-len);
        boot_chksum(image);
        fwrite(image,1,DISKSIZE,stdout);
        rc = 0;
      }
      else
        fprintf(stderr,"Image read error!\n");
    }
    else
      fprintf(stderr,"Cannot open '%s'!\n",argv[0]);  
  }
  else
    fprintf(stderr,"Usage: %s <image data>\n",argv[0]);

  return rc;
}
It extends the image to 880K and inserts the correct boot block checksum.

BTW, I just realized that under Windows you should better open the image file with fwrite(name,"wb") instead of writing to stdout, because of that stupid CR/LF translation.

Additionally you can easily define the layout of your disk image in an assembler source:
Code:
        org     0


        ; AmigaDOS boot blocks (1024 bytes)
boot:
        dc.b    "DOS",0
        dc.l    0                       ; checksum will be inserted here
        dc.l    880

;---------------------------------------------------------------------------
boot_code:
; a6 = SysBase
; a1 = trackdisk IOStdReq

        ...


        rorg    11*512                  ; start of track 1

demo1:
        incbin  "demo1.bin"

        cnop    0,512                   ; align to next block

demo2:
        incbin  "demo2.bin"

        ...
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