対話モードで mmix を使用して、レジスターの内容を確認したいときにいつでも表示する方法を知りたいです。たとえば、単純な mmix プログラムがあります。
% Compute D=4A-2B+16C
%LABEL OPCode Operands Comments
LOC Data_Segment
GREG @
A OCTA 3 Reserve an octabyte for A
B OCTA #10 Reserve an octabyte for B
C OCTA 2 Reserve an octabyte for C
D OCTA 0 Reserve an octabyte for D
LOC #100 start assembly instructions
Main LDO $0,A $0 contents of A
LDO $1,B $1 contents of B
LDO $2,C $2 contents of C
SL $0,$0,2 $0 = 4*$0
SL $1,$1,1 $1 = 2*$1
SL $2,$2,4 $2 = 16*$2
SUB $0,$0,$1 $0 < 4A-2B
ADD $0,$0,$2 $0 < 4A-2B+16C
STO $0,D store answer in D
そして、mmix -i myprog.mmo を実行して出力を取得できます。
mmix>
(00000000000000fc: fb0000ff (UNSAVE)) #6000000000000088: rG=254, ..., rL=2
0 instructions, 0 mems, 0 oops; 0 good guesses, 0 bad
(now at location #0000000000000100)
mmix>
1. 0000000000000100: 8d00fe00 (LDOI) $0=l[0] = M8[#2000000000000000] = 3
1 instruction, 1 mem, 1 oop; 0 good guesses, 0 bad
(now at location #0000000000000104)
mmix>
1. 0000000000000104: 8d01fe08 (LDOI) $1=l[1] = M8[#2000000000000000+8] = 16
2 instructions, 2 mems, 2 oops; 0 good guesses, 0 bad
(now at location #0000000000000108)
mmix>
1. 0000000000000108: 8d02fe10 (LDOI) rL=3, $2=l[2] = M8[#2000000000000000+16] = 2
3 instructions, 3 mems, 3 oops; 0 good guesses, 0 bad
(now at location #000000000000010c)
mmix>
1. 000000000000010c: 39000002 (SLI) $0=l[0] = 3 << 2 = 12
4 instructions, 3 mems, 4 oops; 0 good guesses, 0 bad
(now at location #0000000000000110)
mmix>
1. 0000000000000110: 39010101 (SLI) $1=l[1] = 16 << 1 = 32
5 instructions, 3 mems, 5 oops; 0 good guesses, 0 bad
(now at location #0000000000000114)
mmix>
1. 0000000000000114: 39020204 (SLI) $2=l[2] = 2 << 4 = 32
6 instructions, 3 mems, 6 oops; 0 good guesses, 0 bad
(now at location #0000000000000118)
mmix>
1. 0000000000000118: 24000001 (SUB) $0=l[0] = 12 - 32 = -20
7 instructions, 3 mems, 7 oops; 0 good guesses, 0 bad
(now at location #000000000000011c)
mmix>
1. 000000000000011c: 20000002 (ADD) $0=l[0] = -20 + 32 = 12
8 instructions, 3 mems, 8 oops; 0 good guesses, 0 bad
(now at location #0000000000000120)
mmix>
1. 0000000000000120: ad00fe18 (STOI) M8[#2000000000000000+24] = 12
9 instructions, 4 mems, 9 oops; 0 good guesses, 0 bad
(now at location #0000000000000124)
mmix>
1. 0000000000000124: 00000000 (TRAP) Halt(0)
10 instructions, 4 mems, 14 oops; 0 good guesses, 0 bad
(halted at location #0000000000000124)
mmix>
10 instructions, 4 mems, 14 oops; 0 good guesses, 0 bad
(halted at location #0000000000000124)
これはすべて良いことです。しかし、これをインタラクティブに実行している途中でレジスタの内容を調べたい場合はどうすればよいでしょうか? また、内容を10進数ではなく16進数で見るのはどうでしょうか。