Re: New idea HD for C= and 1541 ROM Listing

From: Larry Anderson (
Date: 1999-09-06 21:49:57

Ethan Dicks wrote:
> --- Richard Atkinson <> wrote:
> > Does anyone know how filetypes (PRG, USR, SEQ and REL) are implemented?
> Implemented how?  The difference between a PRG file and an SEQ file (besides
> the bit in the directory entry) is that a PRG starts with the load address
> as a low-byte, high-byte pair.  USR files are undefined by CBM DOS, and REL
> files are different depending on the exact version you have (super-side-sectors
> and the like).  There's lots of code in every drive to support relative files.
> I've writted professional code to manipulate them, but at this point in
> history, I don't think the amount of coding required to continue to support
> them is worth the payback.  Has anyone ever used them for anything more
> interesting than a simple index file, a la electronic Rolodex?
> -ethan
The BBS I prefer to use requires REL files for it's user files and messaging
system. (Image 1.2)  I figure there may be a few other BBS systems that use
REL files as extensively.  Other than that, there are a few databases like the
Consultant... but mainly it would be BBS sysops.

01000011 01001111 01001101 01001101 01001111 01000100 01001111 01010010 01000101
  Larry Anderson - Sysop of Silicon Realms BBS  (209) 754-1363  300-2400 baud
      Commodore 8-bit page at:
01000011 01001111 01001101 01010000 01010101 01010100 01000101 01010010 01010011
This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.