ruud.baltissen_at_apg.nl
Date: 2008-09-03 11:55:28
Hallo allemaal,
Please have a look at the following Basic code:
100 open1,8,15
200 for i=0 to 10 : print i;
210 print#1,"m-w:"chr$(i)chr$(18)chr$(1)chr$(i) : next
400 for i=0 to 10
410 print#1,"m-r:"chr$(i)chr$(18)
420 get#1,a$ : if a$="" then a$=chr$(0)
430 print a$;" "; : next
FYI: $1200-$12FF is buffer 1, $12 = 18
The idea is quite simple: poke some values into Buffer 1 of a 8250 drive
and to read them back again. Whether I run it on a real drive or VICE,
the program frees after producing the numbers 0 and 1 on screen,
outputted by line 200.
Skipping line 200 and 210 by inserting "110 goto 400" shoows the
contents of the programmed memory area.
I ran the program on a C64 and a 1541 in VICE as well (changed 18 to 5).
With the "goto" things run fine, without it line 400-430 only produce 11
times the value 199.
Very obviously something is wrong with the lines 200-210 but I simply
cannot seem to find the error.
HELP !!! TIA!
--
___
/ __|__
/ / |_/ Groetjes, Ruud
\ \__|_\
\___| URL: Ruud.C64.org
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