rmb 2 leax parm1,s get address of 1st param ldd psize1,s get size of 1st param .... You've really got to get the basic09 manual which has some assembler interface examples. Hope this helps. There is 1 Reply. #: 20480 S1/General Interest 19-Oct-94 21:55:23 Sb: #20479-Any suggestions? Fm: Zack Sessions 71532,1555 To: Bob van der Poel 76510,2203 Surely there is a LEN function in BASIC09?!?!? ------------------------------------ Zack C Sessions If you're not the "lead dog", the scenery never changes. #: 20477 S12/OS9/68000 (OSK) 18-Oct-94 14:00:03 Sb: RLE-VSC Fm: Alan Weston 76234,3500 To: all RE:SCC66470 VSC Quick question to MM/1(a) programmers: According to register descriptions in the Philips manual the DCR2 (Display Command Register 2) is at $1fffe8 (given base $1fffe0). According to systype.d (System Definitions for PROTO340 System): BPCRT2 equ $009fffe0 graphics controller base Does this place DCR2 at $009fffe8?? Basically, I'm trying to enable the built in RLE decoding. Any insight would be appreciated. Thanks, Alan Press !>