26 Feb
2009
26 Feb
'09
1:21 p.m.
On Thu, 26 Feb 2009, John Floren wrote:
I thought 80-column cards were 80 bytes? One byte per
column? I've
never actually used them, so if somebody could explain to me that
would be interesting.
There are 80 columns with 12 rows each. I assumed the worst case of
using two ASCII characters to represent each byte. You could punch them
in binary and get 1 byte in each column with a nibble left over in each
column. Or, you could pack 3 nibbles in each column and get 120 bytes,
but it would play hell with your punches. :-)
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/