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1986-09-04
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------------------------------------------------------------------
RX50 Diskette Driver for the IBM PC-AT
------------------------------------------------------------------
8 December 1984
RX50DRVR.SYS is an MS-DOS loadable device driver which enables an
IBM PC-AT to read and write DEC RX50 diskettes on its high
capacity diskette drive. To use the driver, copy it into the
root directory of your system disk and include the following line
in your CONFIG.SYS file: DEVICE=RX50DRVR.SYS
When the system is booted, the driver is loaded and it displays
its name, version number, load address and the drive letter to be
used to refer to RX50 diskettes. This is normally D: but may be
different if you have a second hard disk drive or other block
devices installed.
Once the driver is installed, all the normal disk commands can be
used EXCEPT the FORMAT command. RX50 media cannot be formatted
by the IBM controller, and attempting to do so will make the RX50
diskette unusable. Needless to say, references to drives A: and
D: should not be intermixed: no good will come of it.
The DOS direct disk read and write interrupts (25h and 26h) may
also be used. Block numbers 0 through 19 are mapped to tracks 0
and 1 and the sectors are addressed in physical sequence. Block
numbers 20 through 799 (which cover the area used by MS-DOS) are
mapped to tracks 2 through 79. On each track the sectors are
interleaved 2:1 such that the logical sector sequence of 0..9 is
mapped to the physical sequence 1, 3, 5, 7, 9, 2, 4, 6, 8, 10.
This is consistent with the behaviour of MS-DOS on the DECmate
and the Rainbow.
RX50INIT.COM is a program which initializes an RX50 for use with
MS-DOS. It writes a FAT and directory in the format used by the
DECmate and Rainbow versions of MS-DOS. The command format is:
RX50INIT [d:] [volume-name]
The drive letter d: is optional; D: is the default value. The
volume name is optional; if it is omitted, no volume entry is
made in the directory. If a volume name is given, it may contain
only letters, numerals, and hyphens. Letters are converted to
upper case.
NOTE: After initializing a diskette, remove it from the drive and
then reinsert it before using it. This ensures that DOS recognizes
it as a "new" diskette.
RX50DRVR.SYS and RX50INIT.COM are copyrighted by Robert F. Morse.
Permission is granted for private non-commerical use only.
Questions, comments and suggestions may be sent to:
Robert F. Morse
17 Bowdoin Street
Cambridge, MA 02138
(617) 874-4250
DTN 223-6720
MLO5-2/B6
LEWS2::MORSE