110889     BS-207 Handler for RT-11 and TSX-PLUS  Version: January
1987
 
Submitted by: Dataram Corp, Princeton, NJ
 
Operating System: RT-11 V5.01, TSX-PLUS V6.01  Source Language:
MACRO-11  Hardware Required: BS-207  Keywords: Device Handlers, TSX
 
Abstract: BS is a device handler that can be installed under RT-11 or
TSX-PLUS operating systems.  It makes the Data-Ram
Corporation Bulk Storage Memory System appear to be a
high-speed disk.
 
The Macro Assembler code supplied has been tested under RT-11
version 5.01 and TSX-PLUS version 6.01.  It should also work
with previous releases of RT-11 back to version 4, and
previous releases of TSX-PLUS back to version 3.
 
The handler as supplied supports eight megabytes of BS
memory.  To support more or less, the SIZE parameter must be
changed, and the handler re-assembled and re-linked.
 
Driver Specifications:
.  RT-11 DEVICE ID number:       	174(8)
.  CSR base address:			177460
.  Vector address:			204
.  Handler size (approx):		120(10) words
.  RT-11 Features supported:
		-System Device Support
		-Memory Management
.  Requires EIS hardware
.  Hardware bootstrap
 
This handler supports use as a system device.  In many
cases, significant performance improvement will occur by
loading operating system software onto the BS device, making
it bootable, then booting it.
 
The RT-11 "device identification number" is set to 174 to
allow application programs to identify this device.
 
Notes: This handler does not zero-fill short blocks (less than 512
bytes) written
to it.  Thus the contents of the "non-written" portion of the block is
unpredictable when it is read as a whole block.  In practice, this
does
not appear to be a problem with the operating system, nor application
programs.  It does, however, cause problems with some editors , e.g.,
KED, which write a short block at the end of the edited file upon
exiting.
 
Media (Service Charge Code): One RX02 Diskette (LA)  Format: RT-11,
600' Magnetic Tape (MA)  Format: RT-11