Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site spuxll.UUCP Path: utzoo!linus!vaxine!wjh12!genrad!decvax!harpo!ihnp4!drutx!houxe!hogpc!houti!ariel!vax135!floyd!whuxle!spuxll!pjm From: pjm@spuxll.UUCP Newsgroups: net.micro.cbm Subject: 1541 questions Message-ID: <466@spuxll.UUCP> Date: Thu, 10-May-84 10:15:14 EDT Article-I.D.: spuxll.466 Posted: Thu May 10 10:15:14 1984 Date-Received: Sat, 12-May-84 02:24:19 EDT Organization: AT&T Information Systems, South Plainfield NJ Lines: 49 If you are reading this article to get some answers boy are you going to be disappointed. All I've got is more questions. First of all does anybody have any information on the various disk formats that Commodore has used. They seem to have generic names like 4040 format, 2040 format, and 8050 format in addition to whatever format the 1541 uses. A call to the CBM technical info line revealed that these formats are all at least "slightly" different, but some combinations are only read compatible, while others are read and write compatible, while still others are totally incompatible. Unfortunately I have been unable to ascertain what combinations fall in what catagories. The manual that came with my disk drive says in the chart on page 55 that an ascii A is written in sector 18, block 0, byte 2, and this indicates 4040 format. Does this mean that a 1541 writes 4040 format, or do they both write an A but are different, if so how different? The ultimate goal of all this drivel is to attempt to salvage some disks for my 64 including the data on them. The format character on these disks is an E which CBM says they "think" indicates 8050 format. When I asked CBM how to recover these disks they said use the Wedge N command (re-header the disk). When I got off the floor I told the guy I was looking for a less volitale (sp) way of recovering the DATA on the disks. Ultimately if I could get enough data on the different formats I would consider taking a stab at writing a utility to convert from one format to another. Incidentally I got the idea for doing this from the error description of the DOS MISMATCH error on page 46 of the 1541 manual. The that says that there is a utility available to help do this. It seems that this utility has now turned into a misprint (yes, kiddies that came from CBM technical info, and no there is no santa claus). Seriously, the purpose here is to see if anybody has any info and not to poke fun at Commodore. I enjoy my 64 very much, and would buy another one immediatley if anything happened to it. I do hope that somebody has some of this info, and sends mail, phones, posts, or otherwise communicates some info. Paul Maioriello AT&T ISL spuxll!pjm (201) 561-7100 x2328