15 Dec
2009
15 Dec
'09
8:43 a.m.
How do I identify which board is the video/keyboard interface board? (I
see 4 boards in the card cage)?
How do I identify which chip has failed?
Where do I get replacements?
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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)