110797     LPV07: Lineprinter Handler for HT-11/RT-11V02C  Version:
V07/11, May 1985
Submitted by: Anthony P. Cruz, Roseville, MI
Operating System: RT-11 V2C (HT-11 11/79)  Source Language: MACRO-11
Memory Required: 432-550 Words (option dep.)  Hardware Required: Any
ASCII printer connected to a DLV-11 or DLV-11 "like" interface
addressed at 177510 and vectored at 200.  Keywords: Device Handlers
Abstract: LPV07.MAC is the culmination of a long effort to develop a
functional and truly useful "LP" device driver.  The
major underlying goal was to develop a driver that would
PROPERLY support very modest printers such as DEC'S LA35
lacking Forms Control Option.
Such drivers have been around for some time.  However,
systems lacking adequate operating system support were often
furnished with only the binary versions of the LP driver.
Moreover, such versions often times were capable of handling
only advanced lineprinters equipped with forms control
hardware, automatic perforation skipping and hardware
handshaking.  One operating system typical of those lacking
the appropriate LP driver is HEATH'S HT-11 system.  This
operating system which was available exclusively to owners of
HEATH'S H/WH-11 minicomputer (an LSI-11-based product), is
actually a somewhat "diluted" version of Digital Equipment
Corportations's RT-11VO2C.  As the need arose, and/or as
hardware improvements were made at my installation, new
features were added to the existing driver.  Following the
purchase of a HEATHKIT H-125 Lineprinter, I decided to develop
a final "no-holds-barred" driver, capable of handling the H-125
AND anything inferior to it by simply using the appropriate
conditional assembly file.  This driver is the result of that
effort and should be a boon to users of HT-11 or RT-11V02C.
Media (Service Charge Code): Write-Up and Listing (DC), One RX01
Diskette (KA)  Format: RT-11, 600' Magnetic Tape (MA)  Format: RT-11

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