laser-lovers@uw-beaver (laser-lovers) (11/02/84)
From: "Douglas J. Trainor" <trainor@UCLA-LOCUS.ARPA>
I am experiencing problems using Tektronix 4014 emulation
mode on an Imagen laser printer. I am only using the
MOVE & DRAW commands in the language. There seem to be 2 problems:
i) Occationally, in the middle of a single vector, a small piece
of the line (2-4 pixels long in the y-axis) is translated a
distance along the negative x-axis.
ii) Scan lines are missed, ruining the image. There seems
to be a correlation with the number of vectors in the
image (ie the complexity).
Has anyone seen or can explain this behavior. Are these firmware
bugs or what? I have a dealine a week from today...
_____
/ \
<Douglas>
\_____/
Arpa: trainor@ucla-locus.arpa
UUCP: ...!{cepu, ihnp4, randvax, sdcrdcf, trwspp, ucbvax}!ucla-cs!trainorlaser-lovers@uw-beaver.UUCP (11/02/84)
From: pur-ee!malcolm@Berkeley (Malcolm Slaney) I ran into two problems with the Tektronix Emulation mode on the Imagen. One we were able to get around and the other I wasn't. Imagen has fixed both problems in a later version of the software. Now if I can just get Purdue to buy (and run) the new firmware.... The first problem is that the Imagen didn't always grok the Tek commands. Tek's understand a funky command format that lets you default the most significant bits of a coordinate to the current drawing coordinate. This was done to speed up transmission time. I was able to get around the problem by always sending the full position. I think this fixes the first problem you describe. The other problem I wasn't able to get around is that the Imagen can't draw a vector of length 0 (just one point.) As I said before Imagen has fixed both of these problems. I'm not sure what you mean by "missing scan lines". I often send very complicated 3-d plots (thousands of vectors) to our Imagen and it never loses any of it. I have seen missing scan lines when I tried to use a half tone font but that is another problem. Malcolm Purdue EE Dept.