On Mon, 19 Apr 2004, Ron Hudson wrote: <CTRL-C> to return to BASIC, preserving the program in memory <CTRL-B> to return to BASIC, initializing program space Yes! Only on machines equipped with the proper ROM, which would be the Enhanced Apple //e and the Apple //c+, and of course the original Apple ][ Monitor ROM. The original entry point for the mini-assembler was $F666 (I can't remember if it works on enhanced //e or //c+). Here's some nice historical info: http://apple2history.org/history/ah03.html As always, try Google before asking. Or Vivisimo. $FDED is the entry-point for COUT (the character you want to print should be in the Accumulator). I forget where the CIN routine is. $300 has at least $80 bytes free for small utility programs. A simple sound generating routine is common to place there. Otherwise, you want to stay away from BASIC program space, if you plan to have a BASIC program in memory with your ML code. $2000-$3FFF and $4000-$5FFF are hi-res pages 1 and 2 respectively. $6000 is a good starting point for large programs that will be using hi-res graphics. You've got about $2600 bytes there, more or less depending on how many DOS buffers you have open. Have fun! You really need the original Apple ][ Reference Manual. Let me know if you don't have a copy and we'll rectify that. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]