#100375 LCDIO.TXT
Some further obscure observations on screen dumps…
Looking over SCDUMP.100 in DL0, I see that a technique similar to the one
you describe is used for a moderately fast screen dump to the EPSON printer:
Each byte of graphics data is broken into two 4-bit nibbles and table of size
16 stored in a data statement is used to store each nibble's upside down image
in a one-byte variable, setting a pair bits for each original bit. No
concatenation is required since the image is printed double size so that the
two nibbles are on different LPRINT'ed lines.
Regards…
<<mike safonov>>