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📄 README.txt This is another proof that Vim is perfectly compatible with Vi. The URM macro package was written by Rudolf Koenig ("Rudi") (rudolf@koeniglich.de) for hpux-vi in August 1991. Getting started: type in your shell: vim urm<RETURN> in vim: :so urm.vim<RETURN> in vim: * (to load the registers and boot the URM-machine :-) in vim: g (for 'go') and watch the fun. Per default, 3 and 4 are multiplied. Watch the Program counter, it is visible as a komma moving around. This is a "standard URM" (Universal register machine) interpreter. The URM concept is used in theoretical computer science to aid in theorem proving. Here it proves that vim is a general problem solver (if you bring enough patience). The interpreter begins with register 1 (not 0), without macros and more-lines capability. A dot marks the end of a program. (Bug: there must be a space after the dot.) The registers are the first few lines, beginning with a '>' . The program is the first line after the registers. You should always initialize the registers required by the program. Output register: line 2 Input registers: line 2 to ... Commands: a<n> increment register <n> s<n> decrement register <n> <x>;<y> execute command <x> and then <y> (<x>)<n> execute command <x> while register <n> is nonzero . ("dot blank") halt the machine. Examples: Add register 2 to register 3: (a2;s3)3. Multiply register 2 with register 3: (a4;a5;s2)2; ((a2;s4)4; s3; (a1;a4;s5)5; (a5;s1)1)3. There are more (complicated) examples in the file examples. Note, undo may take a while after a division.	1.54 KB	2025-11-11 23:24
📄 examples Note that enough temporary registers should be provided for each example. All should be initialised to 0. Initial register values for benchmarking: 0,8,3,0,... Performed on a Xenix 386/16: Operation [sec, kbyte tmp space]: program Asym. Diff.[ 7, 4]: (s2;s3)3. Abs. Diff. [90,81]: (a1;a4;s2)2; (a2;s1)1; (a1;a5;s3)3; (a3;s1)1; (s2;s3)3; (s5;s4)4; (a2;s5)5. Add [ 7, 4]: (a2;s3)3. Mult [227, 161]: (a4;a5;s2)2; ((a2;s4)4; s3; (a1;a4;s5)5; (a5;s1)1)3. Copy [ 48, 25]: (a1;a3;s2)2; (a2;s1)1. sign [ 30, 17]: (a3;s2)2; (a2;(s3)3)3. !sign[ 36, 28]: (a3;s2)2; (a2;(s3)3)3; a3; (s3;s2)2; (s3;a2)3. Div [630,1522]: (a9;s2)2; (a2;a10;s3)3; (a3;s2)2; (a2;(s3)3)3; a3; (s3;s2)2; (s3;a2)3; (a2)2;(a2;s9)9;(a3;s10)10; (a9;a10;s2)2; (a11;a12;s3)3; (a2;s12)12; (a3;s9)9; (s2;s3)3; (a3;s2)2; (a2;(s3)3)3; a3; (s3;s2)2; (s3;a2)3; (a1;s2)2; (a2;s10)10; (a3;s11)11; ((a12;a13;s3)3; (a3;s13)13; (s2;s3)3; (a3;s12)12; a14; (s1)1; (a9;a10;s2)2; (a11;a12;s3)3; (a2;s12)12; (a3;s9)9; (s2;s3)3; (a3;s2)2; (a2;(s3)3)3; a3; (s3;s2)2; (s3;a2)3; (a1;s2)2; (a2;s10)10; (a3;s11)11)1; (s2)2; (a2;s14)14.	1.07 KB	2025-11-11 23:24
📄 urm >0 >3 >4 >0 >0 >0 (a4;a5;s2)2; ((a2;s4)4; s3; (a1;a4;s5)5; (a5;s1)1)3. _________ O ; =xp ( =x%hp ) @l a @db s @dt . =x0xkdd:ready _end_ o 0 1 2 3 4 5 6 7 8 9 0 _________ INIT main(k), l, b, c, t, u, q, d "kT "lT "bT "cT "tT "uT "qT "dT =lF'wa/O fpaw"zdt hp@z0"xD@x@k =2ldwhp'wiGT'wp0P0"yD@ya =xlwP >0 =x%p I k/>0 ww"ydt 0D@y 'wa/o fwF'wpi`ar`aF'wffp0"vD@v0"vDp03x@v'wa @c 0 0 0I f0w"wdt 0D@w `ahmaF'wa 'aa1 > @b 0p0f>w"vdt 0D@v 'wa/o wfbF'wpi`ar`aF'wffp0"vD@v0"vDp03x@v'wa @u 9 0 0I f9w"wdt 0D@w `ahmaF'wa `alr0 > @q 0p0f>w"vdt 0D@v `ahy2l'wa `ax >1 @t 0p0/>1 ww"idt 0D@i =xwhpbldwhp'wpaG$ma0"yD@y@	630 B	2025-11-11 23:24
📄 urm.vim map * 1G/INIT j"iT@i1G/INIT dG map g 1G/^[(as;.] i >,mkkmw@k map T y$ map F yl map = 'kf,	96 B	2025-11-11 23:24

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