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Pages: 1 lxd MAME Fan Reged: 02/27/14 Posts: 25 Send PM Why every number before has a "$" in MAME debuger? #322794 - 03/03/14 05:53 PM Reply 0032: 75 90 F1 mov p1,#$F1 0035: 75 B0 EB mov p3,#$EB 0038: 78 7F mov r0,#$7F 003A: 76 00 mov @r0,#$00 003C: D8 FC djnz r0,$003A 003E: 75 81 68 mov sp,#$68 0041: D2 65 setb $2C.5 0043: 12 10 89 lcall $1089 0046: 12 11 4D lcall $114D 0049: 12 11 8E lcall $118E Dose "$" tell me it is HEX? Why not "#F1H" for "#$F1"? I am from China. I am sorry about my English. Sune Connected Reged: 09/21/03 Posts: 5648 Loc: Lagoa Santa, Brasil Send PM Re: Why every number before has a "$" in MAME debuger? [Re: lxd] #322796 - 03/03/14 06:44 PM Reply > 0032: 75 90 F1 mov p1,#$F1 > 0035: 75 B0 EB mov p3,#$EB > 0038: 78 7F mov r0,#$7F > 003A: 76 00 mov @r0,#$00 > 003C: D8 FC djnz r0,$003A > 003E: 75 81 68 mov sp,#$68 > 0041: D2 65 setb $2C.5 > 0043: 12 10 89 lcall $1089 > 0046: 12 11 4D lcall $114D > 0049: 12 11 8E lcall $118E > > Dose "$" tell me it is HEX? Why not "#F1H" for "#$F1"? http://en.wikipedia.org/wiki/Dollar_sign#Use_in_computer_software S Vas Crabb BOFH Reged: 12/13/05 Posts: 4462 Loc: Melbourne, Australia Send PM Re: Why every number before has a "$" in MAME debuger? [Re: lxd] #322803 - 03/03/14 09:54 PM Reply The convention used depends on the CPU. The Motorola convention uses $ to indicate a number is hexadecimal and # to indicate it's a literal value. $1234 = value at memory location 0x1234 #$1234 = literal value 0x1234 Anonymous Unregistered Send PM Re: Why every number before has a "$" in MAME debuger? [Re: lxd] #322823 - 03/04/14 10:57 AM Reply > 0032: 75 90 F1 mov p1,#$F1 > 0035: 75 B0 EB mov p3,#$EB > 0038: 78 7F mov r0,#$7F > 003A: 76 00 mov @r0,#$00 > 003C: D8 FC djnz r0,$003A > 003E: 75 81 68 mov sp,#$68 > 0041: D2 65 setb $2C.5 > 0043: 12 10 89 lcall $1089 > 0046: 12 11 4D lcall $114D > 0049: 12 11 8E lcall $118E > > Dose "$" tell me it is HEX? Why not "#F1H" for "#$F1"? $ means hex # means literal, as apposed to a memory address English is read left to write, having $ at the beginning means that you know that it's hex before you read the hex number. Having it at the end you might have to go back and re-read the number. Because hex numbers include A-F then using H will merge into the number and make it harder to read. I imagine these perceptual queues are stronger if English is your first language. My brain seems wired to read logic in C code as English too, for people who don't follow this (either non-English speakers or people who don't try to read their code) I find it harder because of grammatical issues like double negatives. Edited by smf (03/04/14 10:58 AM) R. Belmont Cuckoo for IGAvania Reged: 09/21/03 Posts: 9716 Loc: ECV-197 The Orville Send PM Re: Why every number before has a "$" in MAME debuger? [Re: Vas Crabb] #322831 - 03/04/14 06:07 PM Reply > The convention used depends on the CPU. The Motorola convention uses $ to indicate a > number is hexadecimal and # to indicate it's a literal value. Yup, and the 6502 inherited that. I believe MAME does show "02h" for x86 even though Intel assembly syntax is Satanic ;-) Pages: 1

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