15 Dec
2009
15 Dec
'09
7:55 a.m.
--- On Tue, 12/15/09, Alexandre Souza - Listas <pu1bzz.listas at gmail.com> wrote:
Use the force :)
You know that a byte has 8 bit.
You know that a space (chr 32) is
00100000 in binary
You know that a exclamation point (chr
33) is 00100001 in binary
You know that in the place of a space,
there is a ! on the screen
So, you know that the least significant
bit, or D0 line, is stuck in "1"
Get the schematic and see which 2114 is
connected to the A0 line. Change it, and you're set :o)
Don't you mean, D0 line? <grin>
According to the schematics, both U21 and U22 are on the D0 line.
One thing I just thought of - is the ENTIRE screen affected, or just half of it? If one
chip had a stuck line, it should only mess up half the screen.
In any event, the chips should be socketed, so doing a couple quick swaps should narrow it
down quickly.
-Ian