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- Path: crl9.crl.com!not-for-mail
- From: ceejack@crl.com (Jack Vander White)
- Newsgroups: comp.sys.cbm
- Subject: Re: 1571
- Date: 8 Feb 1996 09:53:37 -0800
- Organization: Humanity Against Late-Night Infomercials
- Message-ID: <4fddb1$30o@crl9.crl.com>
- References: <4f6jo1$ub8@news.magick.net>
- NNTP-Posting-Host: crl9.crl.com
- X-Newsreader: TIN [version 1.2 PL2]
-
- Denise Fields (dfields@gp.magick.net) wrote:
- : OK, another dumb question. Does the 1571 read both sides without
- : flopping a disk?? know some PC's do that, and yes i read my 'book', but
- : do not know what it is tlling me, I guess. Have only used 1541's before,
- : and just realized from stuff I read here that the 1571 has 2 heads? The
- : better to read you with (my dear9 to paraphrase???Or just to go bonkers?
-
- There are several parts to that answer.
-
- 1. Yes, the 1571 is capable of reading both sides of a disk.
-
- 2. On a 128 in 128 mode if you format a disk it will format in double
- sided mode and have twice as many blocks as a 1541 disk.
-
- 3. On a 64, or if you go to 64 mode on a 128 by holding down the logo
- key at startup It will switch to 1541 mode and read only one side.
- If you format a disk in this mode it will format as a 1541 single sided
- disk.
-
- 4. It will not, in either 64 or 128 mode read the second side of a 1541
- disk that was formatted by flipping it over unless you flip it over.
-
- 5. There are a set of commands called "U" commands for the 1571 that
- you need to learn.
-
- D#=Device Number, substitute the device number your 1571 is using for this.
-
- SET 1541 MODE OPEN 15,D#,15,"U0>M0":CLOSE 15
- SET 1571 MODE OPEN 15,D#,15,"U0>M1":CLOSE 15
- SET to HEAD #0 OPEN 15,D#,15,"U0>H0":CLOSE 15
- SET to HEAD #1 OPEN 15,D#,15,"U0>H1":CLOSE 15
-
- If you set to 1571 mode in either 128 or 64 mode it will read, write and
- format the disk as a double sided 1571 disk with twice as many blocks.
- However, you can still only have 144 files on the disk.
-
- If you set to 1541 mode in either 128 or 64 mode it will read, write and
- format the disk as a single sided 1541 disk. If you then set it to Head
- #0 and format and then set it to head #1 and format it will format each
- side as a 1541 disk and you can store 144 files on each side. However,
- what you put on side 2 can not be accessed by a 1541 disk drive. It will
- be recorded backwards to the way a 1541 reads.
-
- There are several reasons why the use of the above is not recommended:
-
- 1. Some early 1571 ROMS have trouble accessing side 2.
- 2. When using a program it will cause problems unless the program is
- set up to handle disks formatted this way.
- 3. There are very few copy programs that can copy data from/to disks
- formatted this way.
-
-
- : told you it was a dumb question...but do need an answer.
-
- The only dumb question is the one you don't ask because you think
- it's dumb.
-
- Jack VW
-
-
-