Commodore 128D - Mfm Disk Formats

MFM Disk
Formats
The visual effects associated with following functions are visible only
with the 80-column screen format.
ESC>
ESC<
ESCG4
♦ESCG3
ESCG2
*ESCG1
ESCGO
Half intensity
Full intensity
Reverse video ON
Turn underline ON
Blink ON
Select the alternate character set
All ESCG attributes OFF
*NOTE: This is NOT a normal ADM31 sequence.
For non-Commodore CP/M programs you will probably need to spec
ify the format of the CP/M program disk. Format in this case refers to
a particular way of arranging the data on a disk. These disk formats
(referred to as MFM formats) generally are designed to match the
specific capabilities of the system for which the particular CP/M
program was created.
When used with the fast 1571 disk drive, the Commodore 128 sup
ports a variety of double density MFM disk formats, (for reading and/
or writing), including:
Epson QX10 (512 byte sectors, double sided, 10 sec
tors per track)
IBM-8 SS (CP/M 86) (512 byte sectors, single sided, 8 sectors
per track)
IBM-8 DS (CP/M 86) (512 byte sectors, double sided, 8 sectors
per track)
KayPro II (512 byte sectors, single sided, 10 sectors
per track)
KayPro IV (512 byte sectors, double sided, 10 sec
tors per track)
Osborne DD (1024 byte sectors, single sided, 5 sectors
per track)
When you insert one of these disks into the disk drive and try to
access it, the system senses the type of disk with respect to the
number of bytes per sector and the number of sectors per track. If
the disk format is not unique, a box is displayed near the bottom left
corner of the screen, showing which disk type you are accessing.
The system requires you to select the specific disk type by scrolling
through the choices given in this window. Note: The choices are
given one at a time; scroll through using the right and left arrow keys.
Type RETURN when the disk type that you know is in the disk drive is
displayed. Typing CONTROL RETURN will lock this disk format so
that you will not need to select the disk type each time you access
the disk drive.
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LJ
226
USING CP/M MODE—Commodore Enhancements to CP/M 3.0