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- From: cyberman@exucom.com (Stephen R. Phillips)
- Newsgroups: comp.graphics
- Subject: Re: More HP7475 plotter help needed
- Message-ID: <1993Jan9.161609.8287@exucom.com>
- Date: 9 Jan 93 16:16:09 GMT
- References: <1993Jan5.213236.3967@lynx.dac.northeastern.edu>
- Organization: ExuCom Multimedia Inc.
- Lines: 36
- X-Newsreader: TIN [version 1.1 PL8]
-
- leonard kay (lkay@lynx.dac.northeastern.edu) wrote:
-
- : Now, I have a hardware-related question about the 7475:
- : To standardize things, I normally create my plot output
- : to a file, which I then plot using the following
- : DOS command:
-
- : copy [filename] com2:/b
-
- ACK! NO NO NO NO NO NO NO NO NO!
- IF it's set > 1200 bps this will cause major problems!
-
- : The problem is in about 50% of cases, the plotter hangs
- : at some point and I get a 'write error' on com2: .
- : Sometimes I can hit (R)etry and it goes merrily along,
- : sometimes not. What gives here? What can I do? I get
- : the feeling that the plotter or computer (a 386 clone)
- : is misinterpreting something as a handshake? Yes? No?
- : Any ideas?
-
- YES install a fossil driver for com2. This will give you interupt
- driven file IO for com2. A fossil is a REAL device driver for the com
- ports hence why I suggest it. The bios serial functions are PITIFUL and
- quite frankly just plain SUCK! Install a fossil device driver and your
- problem will disappear in a blink. This is a problem with DOS's brain
- dead com device drivers not your computer. It's sowtware (DOS ) not hardware.
-
- : PS This only happens with the copy command. Plotting
- : from within a graphics package works without a hitch.
-
- Of course! They provide interupt driven IO! :)
-
- Cyberman
- --
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- Read rec.games.programer!
-