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NECPRTSC.DOC
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1983-06-30
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2KB
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42 lines
NECPRTSC by Dan O'Brien
(version 1.2)
NECPRTSC.COM is a driver that allows the NEC 8023
dot matrix printer to print the Shft-PrtSc screen
print sequence. Without this driver the NEC prints
the entire screen on a single line. (This, no doubt,
saves paper, but is not very useful.)
The default print mode for the NEC is called logic
seeking mode where the data is queued in its
internal 2k buffer. (This mode prints output very
fast.) In this mode, the printer requires a carriage
return followed by a line feed to signal that a new
line is required in the output text. Unfortunetly,
the IBM ROM BIOS for screen print sends a line feed
followed by a carriage return sequence. Thus, the NEC
fails to skip to a new line. Therefore, this driver was
written.
NECPRTSC is based on the IBM ROM BIOS for screen
print (INT 5). (See Tech. Ref. A-79) It is nearly an
exact copy, except for the CR-LF sequence instead of LF-CR.
The ROM was disassembled using DEBUG with the output
redirected to a file using this DOS 2.0 feature.
To use the driver, issue NECPRTSC in your autoexec.bat
file, once. NECPRTSC will set up the INT 5 vector and then
attach itself as part of DOS. It produces no messages.
The only way to detect its presents is to issue Shft-PrtSc
and watch it work. Try it before you put it in your AUTOEXEC.BAT
to make sure it works.
A new feature of NECPRTSC (version 1.2) is that it translates
the screen characters, where possible, into equivalent or
nearly equivalent NEC 8023 characters. Thus, you will see on
the printed page a close approximation of the screen.
Comments and suggestions are welcome. They may be
left on the PCmodem BBS (Gene Plantz') at 312 259-8086.
Leave messages for DAN OBRIEN (no apostrophe). Have fun.