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869622ad38
Technically, i consider this an excellent work. I've made some efforts to make it easier for people get it actually up & running. This would have required an image of a DOS boot floppy, which we cannot provide. Instead, i wrote a small bootstrap loader (basically a small more(1) clone with builtin text) that can be ``booted'' from. It instructs the user how to get the image of a bootable DOS floppy, and where to find the various files. (The bootstrap loader requires bcc to be recompiled, but i'm providing a gzip'ed/uuencoded version in the files directory as well.) The pkg directory is not yet done. Will follow RSN. :)
80 lines
1.8 KiB
Plaintext
80 lines
1.8 KiB
Plaintext
*** cpu.c.orig Wed Jun 22 16:24:50 1994
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--- cpu.c Tue Jan 24 18:37:17 1995
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***************
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*** 1127,1132 ****
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--- 1127,1133 ----
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static INLINE2 void i_daa(void)
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{
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+ /* Opcode 0x27 */
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if (AF || ((*bregs[AL] & 0xf) > 9))
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{
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*bregs[AL] += 6;
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***************
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*** 1300,1305 ****
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--- 1301,1330 ----
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c_ss = SegToMemPtr(SS);
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}
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+ static INLINE2 void i_das(void)
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+ {
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+ /* Opcode 0x2f */
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+ if (AF || ((*bregs[AL] & 0xf) > 9))
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+ {
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+ *bregs[AL] -= 6;
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+ AF = 1;
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+ }
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+ else
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+ AF = 0;
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+
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+ if (CF || (*bregs[AL] > 0x9f))
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+ {
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+ *bregs[AL] -= 0x60;
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+ CF = 1;
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+ }
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+ else
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+ CF = 0;
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+
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+ SetPF(*bregs[AL]);
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+ SetSFB(*bregs[AL]);
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+ SetZFB(*bregs[AL]);
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+ }
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+
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/* most XOR instructions go here */
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***************
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*** 4140,4146 ****
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{
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fprintf(stderr,"Error: Unimplemented opcode %02X at cs:ip = %04X:%04X\n",
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c_cs[ip-1],sregs[CS],ip-1);
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! exit(1);
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}
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--- 4165,4171 ----
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{
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fprintf(stderr,"Error: Unimplemented opcode %02X at cs:ip = %04X:%04X\n",
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c_cs[ip-1],sregs[CS],ip-1);
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! /* exit(1); */
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}
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***************
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*** 4218,4224 ****
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case 0x2c: i_sub_ald8(); break;
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case 0x2d: i_sub_axd16(); break;
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case 0x2e: i_cs(); break;
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! case 0x2f: i_notdone(); break;
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case 0x30: i_xor_br8(); break;
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case 0x31: i_xor_wr16(); break;
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case 0x32: i_xor_r8b(); break;
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--- 4243,4249 ----
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case 0x2c: i_sub_ald8(); break;
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case 0x2d: i_sub_axd16(); break;
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case 0x2e: i_cs(); break;
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! case 0x2f: i_das(); break;
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case 0x30: i_xor_br8(); break;
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case 0x31: i_xor_wr16(); break;
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case 0x32: i_xor_r8b(); break;
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