dr@ski.UUCP (David Robins) (11/11/85)
This is a follow-up posting on a problem I'm having with the Apple
80-Column card.
An odd quirk is that when the card is active, in 40 or 80 col modes,
the INVERSE acts peculiarly.
Try this: 10 FOR I= 0 TO 30
20 NORMAL
30 PRINT "NORMAL"
40 INVERSE
50 PRINT X
60 NORMAL
70 NEXT
If the screen is HOMEed first, the NORMAL prints in normal, followed
on the next line by a zero, in inverse mode. The rest of each line is
normal blank (black).
When the printing hits the bottom line, and scrolling begins, the
output changes: the word NORMAL is followed on the rest of it's line
by INVERSE BLANKS (white). The Inverse zero in the next line is
followed by normal blanks (black).
If you add commas to the end of the 2 PRINT statements, the inverse
zero is followed by inverse spaces, but hte normal "NORMAL" is follwed
by normal spaces, WHETHER HOMEed FIRST OR NOT!
I tried using CHR$ commands as in the 80-col manual, instead of the
INVERSE and NORMAL, but it was the same.
None of this happens if the card is turned off. I was able to get
around the problem when I found that using HTAB and VTAB prevented
this from happening, since no scrolling was involved.
If anyone understands why this unwanted INVERSE is happening, inspite
of issuing the NORMAL command, please post an answer, or mail me an
answeer. (My dealer is very reluctant to email this to Apple!)
--
====================================================================
David Robins, M.D.
Smith-Kettlewell Institute of Visual Sciences
2232 Webster St; San Francisco CA 94115
415/561-1705
{ihnp4,qantel,dual}!ptsfa!ski!dr
The opinions expressed herein do not reflect the opinion of the Institute!