Hi,

Yes, the LaserJet 1100 is compatible with DOS.
The printer uses the HP PCL5e language.
The printer has 26 Intellifont scalable typefaces built in. (Printer fonts).

PCL 5 Printer Language Technical Reference Manual:
http://h20000.www2.hp.com/bc/docs/su...0/bpl13210.pdf

PCL 5 Printer Language Technical Quick Reference Guide:
http://h20000.www2.hp.com/bc/docs/su...5/bpl13205.pdf

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Write first a DOS program on a 100% DOS PC and then port the code to the PIC.

Best regards,

Luciano