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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