SOURCE TEXT FOR SIO2PC: This source code assembles using A86, the excellent shareware assembler. The files end in .S and are assembled using ASM1.BAT or ASM2.BAT to create the one and two chip versions. I give A86 a wildcarded filespec, causing it to assemble files in numerical, then alpha order, 1---, 2---, A---, etc. That's why my files start with those numbers and letters, to get assembly done in the desired sequence. Nick nkennedy@cswnet.com