n023el@tamuts.tamu.edu (Robert Ellis) (07/10/90)
I am posting this for Rick Grevelle whom is unable to do so at this time. ---------------------------------------------------------------------- >From n233dk Mon Jul 09 08:08:29 1990 Return-Path: <n233dk> Received: by tamuts.tamu.edu (/\../\ Smail3.1.14.4 #14.2) id <m0hfj5N-00001gC@tamuts.tamu.edu>; Mon, 09 Jul 90 08:08 CDT Message-Id: <m0hfj5N-00001gC@tamuts.tamu.edu> Date: Mon, 09 Jul 90 08:08 CDT From: n233dk (Rick Grevelle) To: n023el I have recently become unhappy with the POKE routine. I hate having to constantly manipulate the wordsize to poke data less than 16 nibbles. The most annoying thing about this is the display routines in the 28 display binary integers according to the current wordsize instead of their actual size. Furthermore, POKE does no argument checking and must depend on key word programming for this as well. I would prefer to use a POKE routine that was independent of wordsize, and would check each argument it takes from the stack. The following is a disassembly, using Alonzo Gariepy's mnemonics, of a POKE that will do this. #00000: 132 swap.a a,d0 #00003: 103 move.w a,r3 #00006: 7430 call.3 #0003E #0000A: 10A move.w c,r2 #0000D: 7D20 call.3 #0003E #00011: 109 move.w c,r1 #00014: 7620 call.3 #0003E #00018: AFA move.w c,a #0001B: 119 move.w r1,c #0001E: 134 move.a c,d0 #00021: 11A move.w r2,c #00024: 80D0 move.1 c,0,p #00028: 1501 move.wp a,@d0 #0002C: 20 move.1 0,p #0002E: 113 move.w r3,a #00031: 132 swap.a a,d0 #00034: 142 move.a @d0,a #00037: 164 add.a 5,d0 #0003A: 808C move.a @a,pc #0003E: 143 move.a @d1,a #00041: 130 move.a a,d0 #00044: 142 move.a @d0,a #00047: 3407A20 move.p5 #02A70,c #0004E: 8A6DD brne.a c,a,#0002E #00053: 169 add.a 10,d0 #00056: 146 move.a @d0,c #00059: 174 add.a 5,d1 #0005C: E7 inc.a d #0005E: 01 ret To use this POKE, place the data to be poked in level 3, the address to be poked in level 2, and the number of nibbles being poked in level 1. All three levels must be binary numbers. The binary value in level 1 will need to correspond to the position of the nibble(s) being poked. +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ | 15| 14| 13| 12| 11| 10| 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ For example, #4h in level 1 will poke the five nibbles 0-4. I prefer this because it is in terms of the sixteen nibble fields used by the routine. If this is a problem, the following program will hopefully solve it. This program, CPOKE, will create POKE which will use an integer (1-16) taken from level 1, and do the necessary conversion. CPEEK << << 1 - R->B A >> 5 # 2D7A010347301231h # 31911AFA02679010h # 110210510D08A114h # 41C8084612412313h # A802A70432410313h # 107E471641961DD6h 1 5 START # 3B82 SYSEVAL NEXT # 7195h SYSEVAL # 44A4h SYSEVAL # 7F77h SYSEVAL # 3F41h SYSEVAL # 3EEBh SYSEVAL 'POKE' STO >> After I recieve shipment of my 48 I'll post a version for it too. (for those who are unable to download to thier calculators) Rick