I didn't realize that Integer BASIC also included the ROM image...in which case I don't need it. Was there a special manual for those commands or were they covered in the DOS 3.3 book? Thanks. -----Original Message----- From: Sellam Ismail [mailto:foo@siconic.com] Sent: Monday, October 28, 2002 8:08 PM To: cctalk(a)classiccmp.org Subject: Re: Apple II Programmer's Aid ROM On Mon, 28 Oct 2002, Eric Smith wrote: And of course if you boot the DOS 3.3 System Master on a 64K Apple ][, it will load the Integer BASIC ROM image (containing the Programmer's Aid ROM) into the upper 16K of memory. Then you can switch into Integer BASIC from Applesoft BASIC by typing 'INT' (which is a DOS command). To get back to Applesoft type 'FP' (for Floating Point, as in floating point BASIC). INT basically bank-switches in the ROM image in RAM. You can also press RESET to get back to Applesoft. Switching using either command will init your environment from scratch (i.e. any BASIC program in memory, either Applesoft or Integer, is lost). Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *