BASIC's question mark and PRINT

--- Jim Battle <frustum at pacbell.net> wrote: Depending on the specific release, Microsoft used different token values for many Basic keywords. For 4K version 3.2, the token used for 'Print' was 90h. For the 8K version 4.0 release, the token used was 96h. For Extended Basic 4.1, it was 91h. And for the 680b variation (which was essentially equivalent to 8k version 3.2 for the 8080) the token for 'Print' was 95h. Regarding the use of '?' for 'Print', he question mark was not handled with it's own unique assigned token. Early in the bit of code that 'tokenizes' a line, there is an explicit check for a '?' after the line number is processed (or as the first byte in direct command mode) ...if found, the actual token for 'Print' is substituted, and it is processed accordingly. As new revisions of MS Basic were introduced, the methodology used to interpret/process Basic tokens evolved somewhat as well. There was mention previously in this thread that token values less than 80h were likely not used. This was indeed the case until Extended Basic (and Extended Disk Basic) was released. It was at that point that token values that were less than 80h were used expressly for functions. In addition, token values from F0h to FFh were used for logic operations (AND, XOR, etc...). Scott __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com