]> cloudbase.mooo.com Git - ddt180.git/blobdiff - ddt180.z80
Add CSIO interface.
[ddt180.git] / ddt180.z80
index 81b68b483138257f16069a1ba913cecc701e25ae..20d7a141de444ea23dd9862e77160fdf1408b868 100644 (file)
 ;   - Use Digital Research Link-80 to generate a .PRL file (op switch).\r
 ;   - Cut the .PRL header (first 256 byte) end rename the result to DDTZ.COM.\r
 \r
-TPA    equ     0100h\r
 \r
-       cseg\r
-ldr_start:\r
-       LD      SP,stack\r
+       maclib  config.inc\r
 \r
-;      LD      DE,signon\r
-;      LD      C,BDOS_PSTR\r
-;      CALL    BDOS\r
+; Some greneral definitions\r
 \r
-       ld hl,(1)               ;wboot addr\r
-       ld de,?const\r
-       ld b,3\r
-vini_l:\r
-       inc     hl\r
-       inc     hl\r
-       inc     hl\r
-       ex      de,hl\r
-       inc     hl\r
-       ld      (hl),e\r
-       inc     hl\r
-       ld      (hl),d\r
-       inc     hl\r
-       ex      de,hl\r
-       djnz    vini_l\r
+BS             equ     08h\r
+TAB            equ     09h\r
+CR             equ     0dh\r
+LF             equ     0ah\r
+DEL            equ     7fh\r
+CNTRX          equ     'X'-'@'\r
+\r
+; CP/M memory layout\r
+\r
+BDOS           equ     5\r
+TPA            equ     0100h\r
+\r
+; ddtz specific definitions\r
+\r
+STACK_SIZE     equ     80      ;ddtz internal stack\r
+CONBUF_SIZE    equ     80      ;Size of console input buffer\r
+BP_CNT         equ     12      ;Number of breakpoints\r
+BP_SIZE                equ     4       ;Size of a breakpoint record\r
+\r
+bitmap_size    equ     (prog_size+7)/8\r
+\r
+;-------------------------------------------------------------------------------\r
+\r
+       cseg\r
+start::\r
+ddtz_base::\r
+       jr reloc\r
+       nop\r
+l0003h:\r
+       rst 30h                 ;rst used by ddtz\r
+di_or_ei:                      ;ints enabled/disabled while ddtz is running\r
+       nop\r
+       ret\r
+\r
+;-------------------------------------------------------------------------------\r
 \r
 signon:\r
-       call    pstr_inl\r
        db      'DDTZ/180'\r
        db      ' - Version '\r
        maclib  version.inc\r
        defvers\r
-       dc      CR,LF\r
-\r
-;      ld sp,stack\r
-;      exx\r
-;      ld de,ddtz_base\r
-;      call cp_hl_de\r
-;      jr c,l0079h\r
-;      ex de,hl\r
-;l0079h:\r
-;      ld de,TPA\r
-;l007ch:\r
-;      dec hl\r
-;      ld (hl),000h\r
-;      ld a,h\r
-;      sub d\r
-;      ld b,a\r
-;      ld a,l\r
-;      sub e\r
-;      or b\r
-;      jr nz,l007ch\r
-\r
-       ld a,i\r
-       ld (reg.i),a\r
-       ld a,0f3h\r
-       jp po,l0093h\r
-       ld a,0fbh\r
-l0093h:\r
-       ld (reg.iff),a\r
-       call di_or_ei\r
-       ld hl,ddtz_base\r
-       ld l,000h\r
-       ld (reg_sp),hl\r
-\r
-       jp mainloop\r
+       dc      '  ('\r
 \r
 ;-------------------------------------------------------------------------------\r
-; Relocation loader\r
-;\r
-       LD      HL,ddtz_end             ;start of reloc bitmap\r
-       ld      bc,0108h                ;init bit counter\r
+; Clear old position\r
 \r
-       EXX\r
-       LD      HL,(BDOS+1)\r
-       LD      (ddtz_base+1),HL\r
-       LD      BC,ddtz_size-1\r
-       LD      D,B\r
-       LD      E,0FFH\r
-       INC     DE                      ;size rounded up to next page boundary\r
-       INC     BC                      ;ddtz_size\r
-       OR      A\r
-       SBC     HL,DE                   ;BDOS - size\r
-       LD      (BDOS+1),HL             ;-> new BDOS entry\r
+cmde_clr:\r
+       ld      (hl),0\r
+       inc     hl\r
+       dec     bc\r
+       ld      a,b\r
+       or      c\r
+       jr      nz,cmde_clr\r
+\r
+; Determine current position\r
+\r
+reloc:\r
+       ld      bc,(028h-2)\r
+       ld      de,(028h)\r
+       ld      a,i                     ;get iff2\r
+       ex      af,af'\r
+       di\r
+       ld      sp,028h                 ;rst instr needs a minimal stack\r
+       ld      hl,0e9e1h               ;opcpdes pop hl/jp (hl)\r
+       ld      (028h),hl\r
+       rst     028h\r
+wearehere:\r
+       ld      (028h-2),bc\r
+       ld      (028h),de\r
+       ld      de,-(wearehere-ddtz_base)\r
+       add     hl,de                   ; hl:\r
+\r
+       ld      de,ddtz_base            ; de:\r
+       or      a\r
+       sbc     hl,de\r
+       ex      de,hl                   ; de: reloc offset\r
+       ld      hl,stack\r
+       add     hl,de\r
+       ld      sp,hl\r
+       ex      af,af'\r
+       push    af\r
+       pop     bc\r
+       bit     2,c\r
+       jr      z,$+3\r
+       ei\r
+       ld      hl,ddtz_end             ;start of reloc bitmap\r
+       add     hl,de\r
 \r
        push    hl\r
-       PUSH    BC\r
-       ld      de,ldr_end\r
-       sbc     hl,de\r
-       EX      DE,HL                   ;-> DE\r
-       LD      HL,ldr_size\r
-       add     hl,bc\r
-       ld      b,h\r
-       ld      c,l\r
-       LD      HL,TPA\r
+       exx\r
+       pop     hl\r
+       ld      bc,0108h                ;init bit counter b (c==reload val)\r
+       exx\r
+\r
+       LD      HL,ddtz_base\r
+       add     hl,de                   ;--> ddtz_base\r
+       ld      bc,prog_size\r
 reloc_lp:\r
        EXX\r
        djnz    reloc_nl\r
@@ -125,112 +132,347 @@ reloc_next:
        ld      a,b\r
        or      c\r
        jr      nz,reloc_lp\r
-       dec     hl\r
 \r
-       POP     BC\r
-       pop     de\r
-       EX      DE,HL\r
-       ADD     HL,BC\r
-       EX      DE,HL\r
-       DEC     DE\r
-       LDDR\r
-       LD      HL,conbuf+2-ddtz_base\r
-       ADD     HL,DE\r
-       JP      (HL)\r
+;-------------------------------------------------------------------------------\r
+\r
+\r
+init::\r
+       LD      SP,stack\r
+\r
+    if CPM\r
+\r
+       ld      hl,(1)          ;wboot addr\r
+       ld      de,convec\r
+       ex      de,hl\r
+       ld      b,3\r
+vini_l:\r
+       inc     de\r
+       inc     de\r
+       inc     de\r
+       inc     hl\r
+       ld      (hl),e\r
+       inc     hl\r
+       ld      (hl),d\r
+       inc     hl\r
+       djnz    vini_l\r
+    else\r
+       xor     a\r
+       dec     a\r
+       daa                     ; Z80: 099H, x180+: 0F9H\r
+       cp      99h             ; Result on 180 type cpus is F9 here. Thanks Hitachi\r
+       jr      z,ini_z80\r
+\r
+       xor     a\r
+       call    cinit\r
+       ld      a,1\r
+       call    cinit\r
+       jr      ini_sign\r
+ini_z80:\r
+;      if ...\r
+;      .printx Error: Not yet implemented!\r
+;      db "Stop\r
+;      endif\r
+    endif      ; CPM\r
+\r
+ini_sign:\r
+       ld      hl,signon\r
+       call    pstr\r
+       ld      hl,ddtz_base\r
+       call    out_hl\r
+       call    pstr_inl\r
+       dc      ' - '\r
+       ld      de,prog_size+bitmap_size-1\r
+       add     hl,de\r
+       call    out_hl\r
+       call    pstr_inl\r
+       dc      ')',CR,LF\r
+\r
+       ld      a,i\r
+       ld      (reg.i),a\r
+       ld      a,0f3h\r
+       jp      po,l0093h\r
+       ld      a,0fbh\r
+l0093h:\r
+       ld      (reg.iff),a\r
+       call    di_or_ei\r
+       ld      hl,ddtz_base\r
+       ld      l,000h\r
+       ld      (reg_sp),hl\r
 \r
-ldr_end:\r
-ldr_size       equ     $ - ldr_start\r
+       jp      mainloop\r
 \r
 ;-------------------------------------------------------------------------------\r
-; DDT/Z core\r
-;\r
 \r
-; Some greneral definitions\r
+    if CPM\r
 \r
-BS             equ     08h\r
-TAB            equ     09h\r
-CR             equ     0dh\r
-LF             equ     0ah\r
-DEL            equ     7fh\r
-CNTRX          equ     'X'-'@'\r
+convec:\r
+const: jp      0               ; return console input status\r
+conin: jp      0               ; return console input character\r
+conout:        jp      0               ; send console output character\r
 \r
-; CP/M memory layout\r
+    else\r
 \r
-BDOS           equ     5\r
-TPA            equ     0100h\r
+       include z180reg.inc\r
 \r
-; BDOS function calls\r
+iobyte equ     3\r
 \r
-BDOS_PSTR      equ     9       ;Print String\r
+max_device     equ 3\r
 \r
-; ddtz specific definitions\r
+;-------------------------------------------------------------------------------\r
 \r
-STACK_SIZE     equ     80      ;ddtz internal stack\r
-CONBUF_SIZE    equ     80      ;Size of console input buffer\r
-BP_CNT         equ     12      ;Number of breakpoints\r
-BP_SIZE                equ     4       ;Size of a breakpoint record\r
+; init device\r
+cinit:                         ; a = device\r
+       call    vector_io_0\r
+       dw      as0init\r
+       dw      rret\r
+       dw      rret\r
+       dw      rret\r
+\r
+; character input status\r
+const:                         ; return a != 0 if character waiting\r
+       call    vector_io\r
+       dw      as0ista\r
+       dw      null$status\r
+       dw      csio_ista\r
+       dw      null$status\r
+\r
+; character input\r
+conin:                         ; return a = input char\r
+       call    vector_io\r
+       dw      as0inp\r
+       dw      null$input\r
+       dw      csio_inp\r
+       dw      null$input\r
+\r
+; character output\r
+conout:                                ; c = output char\r
+       call    vector_io\r
+       dw      as0out\r
+       dw      rret\r
+       dw      csio_out\r
+       dw      rret\r
 \r
 ;-------------------------------------------------------------------------------\r
 \r
-ddtz_base:\r
-       jp 0\r
-l0003h:\r
-       rst 30h\r
-di_or_ei:\r
-       nop\r
+vector_io:\r
+       ld      a,(iobyte)\r
+vector_io_0:\r
+       pop     hl\r
+       cp      max_device\r
+       jr      c,exist\r
+       ld      a,max_device    ; use null device if a >= max$device\r
+exist:\r
+       call    add_hl_a2\r
+       ld      a,(hl)\r
+       inc     hl\r
+       ld      h,(hl)\r
+       ld      l,a\r
+       jp      (hl)\r
+\r
+;-------------------------------------------------------------------------------\r
+\r
+null$input:\r
+       ld      a,1Ah\r
+rret:\r
+       ret\r
+ret$true:\r
+       or      0FFh\r
        ret\r
 \r
-       ds      STACK_SIZE\r
+null$status:\r
+       xor     a\r
+       ret\r
 \r
-stack:\r
-reg.l2:        db      000h\r
-reg.h2:        db      000h\r
-reg.e2:        db      000h\r
-reg.d2:        db      000h\r
-reg.c2:        db      000h\r
-reg.b2:        db      000h\r
-reg.f2:        db      000h\r
-reg.a2:        db      000h\r
-       db      000h\r
-reg.i: db      000h\r
-reg.iy:        dw      0000h\r
-reg.ix:        dw      0000h\r
-reg.f: db      000h\r
-reg.a: db      000h\r
-reg.c: db      000h\r
-reg.b: db      000h\r
-reg.e: db      000h\r
-reg.d: db      000h\r
-reg.l: db      000h\r
-reg.h: db      000h\r
-reg_sp:        dw      TPA\r
-reg.iff:\r
-       db      0f3h\r
-       db      0c3h\r
-reg.pc:        dw      TPA\r
+;-------------------------------------------------------------------------------\r
+;\r
+; TC = (f PHI /(2*baudrate*Clock_mode)) - 2\r
+;\r
+; TC = (f PHI / (32 * baudrate)) - 2\r
+;\r
+; Init Serial I/O for console input and output (ASCI1)\r
+;\r
 \r
-cmd_rpt:dw     mainloop\r
+\r
+\r
+as0init:\r
+       ld      hl,initab0\r
+       jp      ioiniml\r
+\r
+as1init:\r
+       ld      hl,initab1\r
+       jp      ioiniml\r
+\r
+\r
+       ld      a,M_MPBT\r
+       out0    (cntlb1),a\r
+       ld      a,M_RE + M_TE + M_MOD2  ;Rx/Tx enable\r
+       out0    (cntla1),a\r
+       ld      a,M_RIE\r
+       out0    (stat1),a       ;Enable rx interrupts\r
+\r
+       ret                     ;\r
+\r
+\r
+initab0:\r
+       db      1,stat0,0               ;Disable rx/tx interrupts\r
+                                       ;Enable baud rate generator\r
+       db      1,asext0,M_BRGMOD+M_DCD0DIS+M_CTS0DIS\r
+       db      2,astc0l,low 28, high 28\r
+       db      1,cntlb0,M_MPBT         ;No MP Mode, X16\r
+       db      1,cntla0,M_RE+M_TE+M_MOD2 ;Rx/Tx enable, 8N1\r
+       db      0\r
+\r
+initab1:\r
+       db      1,stat1,0               ;Disable rx/tx ints, disable CTS1\r
+       db      1,asext1,M_BRGMOD       ;Enable baud rate generator\r
+       db      2,astc1l,low 3, high 3\r
+       db      1,cntlb1,M_MPBT         ;No MP Mode, X16\r
+       db      1,cntla1,M_RE+M_TE+M_MOD2 ;Rx/Tx enable, 8N1\r
+       db      0\r
 \r
 ;-------------------------------------------------------------------------------\r
 \r
-conbuf:\r
-       db      CONBUF_SIZE\r
+ioiniml:\r
+       push    bc\r
+       xor     a\r
+ioml_lp:\r
+       ld      b,(hl)\r
+       inc     hl\r
+       cp      b\r
+       jr      z,ioml_e\r
 \r
-       ds      CONBUF_SIZE + 3 - ($ - conbuf)\r
+       ld      c,(hl)\r
+       inc     hl\r
+       otimr\r
+       jr      ioml_lp\r
+ioml_e:\r
+       pop     bc\r
+       ret\r
+\r
+;-------------------------------------------------------------------------------\r
+\r
+as0ista:\r
+       in0     a,(stat0)\r
+       rlca\r
+       sbc     a,a\r
+       ret\r
+\r
+as1ista:\r
+       in0     a,(stat1)\r
+       rlca\r
+       sbc     a,a\r
+       ret\r
+\r
+as0inp:\r
+       in0     a,(stat0)\r
+       rlca\r
+       jr      nc,as0inp\r
+       in0     a,rdr0\r
+       ret\r
+\r
+as1inp:\r
+       in0     a,(stat1)\r
+       rlca\r
+       jr      nc,as1inp\r
+       in0     a,rdr1\r
+       ret\r
+\r
+as0out:\r
+       in0     a,(stat0)\r
+       and     M_TDRE\r
+       jr      z,as0out\r
+       out0    (tdr0),c\r
+       ld      a,c\r
+       ret\r
+\r
+as1out:\r
+       in0     a,(stat1)\r
+       and     M_TDRE\r
+       jr      z,as1out\r
+       out0    (tdr1),c\r
+       ld      a,c\r
+       ret\r
 \r
 ;-------------------------------------------------------------------------------\r
 \r
-?const:        jp      0               ; return console input status\r
-?conin:        jp      0               ; return console input character\r
-?cono: jp      0               ; send console output character\r
 \r
-CMDTAB:\r
-       dw      ERROR ;cmd_@    ;examine/substitute the displacement register @\r
-       dw      ERROR ;cmd_A    ;Assemble\r
+csio_rx_tmp:   db      0ffh\r
+\r
+csio_ista:\r
+       ld      hl,csio_rx_tmp\r
+       ld      a,(hl)\r
+       cp      0ffh\r
+       jr      nz,csist_1\r
+       ld      a,01\r
+       call    csio_wr\r
+       call    csio_rd\r
+       call    csio_rd\r
+       ld      (hl),a\r
+       sub     a,0ffh\r
+       ret     z\r
+csist_1:\r
+       or      0ffh\r
+       ret\r
+\r
+csio_inp:\r
+       ld      hl,csio_rx_tmp\r
+       ld      a,(hl)\r
+       ld      (hl),0ffh\r
+       cp      0ffh\r
+       ret     nz\r
+csin_1:\r
+       ld      a,01\r
+       call    csio_wr\r
+       call    csio_rd\r
+       call    csio_rd\r
+       cp      0ffh\r
+       jr      z,csin_1\r
+       ret\r
+\r
+csio_rd:\r
+       ld      a,M_CSIO_RE\r
+       call    csio_cmd_wait\r
+       in0     a,(trdr)\r
+       ret\r
+\r
+csio_out:\r
+       ld      a,02\r
+       call    csio_wr\r
+       call    csio_rd\r
+       call    csio_rd\r
+       or      a\r
+       jr      z,csio_out\r
+\r
+       ld      a,c\r
+       inc     a               ;ff..02 --> 00..03\r
+       cp      04h\r
+       jr      nc,csout_1\r
+       ld      a,00h\r
+       call    csio_wr\r
+csout_1:\r
+       ld      a,c\r
+csio_wr:\r
+       out0    (trdr),a\r
+       ld      a,M_CSIO_TE\r
+csio_cmd_wait:\r
+       out0    (cntr),a\r
+cswr_wait:\r
+       in0     a,(cntr)\r
+       and     M_CSIO_TE+M_CSIO_RE\r
+       jr      nz,cswr_wait\r
+       ret\r
+\r
+    endif ; CPM\r
+\r
+;-------------------------------------------------------------------------------\r
+\r
+CMDTAB::\r
+;      dw      ERROR ;cmd_@    ;examine/substitute the displacement register @\r
+;      dw      ERROR ;cmd_A    ;Assemble\r
        dw      cmd_B           ;Breakpoints display/set/clear\r
        dw      ERROR ;cmd_C    ;trace over Calls\r
        dw      cmd_D           ;Display memory in hex and ascii\r
-       dw      ERROR           ;\r
+       dw      cmd_E           ;rElocate debugger\r
        dw      ERROR ;cmd_F    ;specify Filename and command line\r
        dw      cmd_G           ;Go\r
        dw      cmd_H           ;compute Hex and other expressions\r
@@ -257,7 +499,7 @@ ERROR:
        call    pstr_inl\r
        dc      '?',CR,LF\r
        ;fall thru\r
-mainloop:\r
+mainloop::\r
        ld sp,stack\r
        ld hl,(reg.pc)\r
        call bp_clr_temporary\r
@@ -276,7 +518,7 @@ mainloop:
        push hl\r
        ld (cmd_rpt),hl\r
        inc de\r
-       sub '@'\r
+       sub 'B'\r
        jr c,ERROR\r
        cp 'Z'+1-'@'\r
        jr nc,ERROR\r
@@ -304,8 +546,7 @@ crlf:
 sub_01d9h:\r
        call    pstr_inl\r
        dc      '-'\r
-       dec hl\r
-       jp cpl.hl\r
+       jp neg.hl\r
 \r
 out_hl_dec_neg:\r
        push hl\r
@@ -372,9 +613,8 @@ out.bin.b:
 l01c9h:\r
        rlca\r
        push    af\r
-       ld      a,'0'/2\r
-       adc     a,a\r
-       call    outchar\r
+       and     1\r
+       call    out_dgt\r
        pop af\r
        djnz l01c9h\r
        ld a,'"'\r
@@ -425,7 +665,7 @@ outchar:
        push af\r
        and 07fh\r
        ld      c,a\r
-       call    ?cono\r
+       call    conout\r
        ld hl,con_col\r
        inc (hl)\r
        pop af\r
@@ -458,10 +698,10 @@ inchar:
        push hl\r
        push de\r
        push bc\r
-       call    ?const\r
+       call    const\r
        and a\r
        jr      z,inch1\r
-       call    ?conin\r
+       call    conin\r
        scf\r
 inch1:\r
        pop bc\r
@@ -479,7 +719,6 @@ DELC:
        call    DELC1\r
        dec     hl\r
        dec     b\r
-       inc     c\r
        ld      a,(hl)\r
        cp      ' '\r
        ret     nc\r
@@ -500,13 +739,10 @@ DELL:
 get_line:\r
        push hl                 ;\r
        ld hl,conbuf            ;\r
-       ld c,(hl)               ;\r
-       inc hl                  ;\r
-       ld b,000h               ;\r
-       inc hl                  ;\r
+       ld b,0                  ;\r
 inlnxtch:\r
-       ld a,c                  ;\r
-       or a                    ;\r
+       ld a,b                  ;\r
+       cp CONBUF_SIZE          ;\r
        jr z,inl_e              ;\r
        call incharw            ;\r
        cp CR                   ;\r
@@ -542,16 +778,12 @@ gl_5:
        call outchar            ;\r
        inc hl                  ;\r
        inc b                   ;\r
-       dec c                   ;\r
        jr inlnxtch             ;\r
 \r
 inl_e:\r
        ld (hl),0\r
-       ld hl,conbuf+1          ;\r
-       ld (hl),b               ;\r
        call CRLF               ;\r
-       inc     hl\r
-       ex      de,hl\r
+       ld de,conbuf            ;\r
        pop hl                  ;\r
        ret                     ;\r
 \r
@@ -706,12 +938,12 @@ l0348h:
        ret m\r
        jr l0348h\r
 \r
-sub_034eh:\r
+get_arg_range_target:\r
        call get_arg_range\r
        push hl\r
        push bc\r
        call next_arg\r
-       call sub_0363h\r
+       call get_arg_final\r
        ex de,hl\r
        pop bc\r
        pop hl\r
@@ -722,7 +954,7 @@ sub_035dh:
        jr c,error0\r
        ret\r
 \r
-sub_0363h:\r
+get_arg_final:\r
        call sub_035dh\r
 l0366h:\r
        jp assert_eol\r
@@ -986,6 +1218,9 @@ do_factor:
        ld hl,TPA\r
        cp 'L'\r
        ret z\r
+       ld hl,(reg.pc)\r
+       cp '$'\r
+       ret z\r
        cp '-'\r
        jr z,fact_factneg\r
        cp '~'\r
@@ -1044,8 +1279,13 @@ fact_reg.CPU:
        ld h,000h\r
        ret\r
 \r
+fact_factinv:\r
+       call fact_factor\r
+       jr cpl.hl\r
+\r
 fact_factneg:\r
        call fact_factor\r
+neg.hl:\r
        dec hl\r
 cpl.hl:\r
        ld a,h\r
@@ -1056,10 +1296,6 @@ cpl.hl:
        ld l,a\r
        ret\r
 \r
-fact_factinv:\r
-       call fact_factor\r
-       jr cpl.hl\r
-\r
 fact_mem:\r
        call expr1\r
        jr c,error1\r
@@ -1337,6 +1573,49 @@ b_0709_start:
        db      000h\r
        db      000h\r
 \r
+;-------------------------------------------------------------------------------\r
+; > E addr\r
+;      relocate debugger to addr\r
+; > ER addr\r
+;      relocate just below addr\r
+;\r
+; Move debugger to given address and restart.\r
+; New location must not overlap with current location.\r
+\r
+\r
+cmd_E:\r
+       call    skipbl\r
+       sub     'R'\r
+       jr      nz,$+3\r
+        inc    de\r
+       push    af\r
+       call    get_arg_final\r
+\r
+       ld      bc,prog_size+bitmap_size\r
+       pop     af\r
+       jr      nz,cmde_bottom\r
+       sbc     hl,bc\r
+cmde_bottom:\r
+       ld      ix,cmde_clr-ddtz_base\r
+       ex      de,hl                   ;de = dst\r
+       add     ix,de\r
+       ld      hl,ddtz_base            ;hl = src\r
+\r
+       push    hl\r
+       or      a\r
+       sbc     hl,de\r
+       call    c,neg.hl                ;abs(distance)\r
+       or      a\r
+       sbc     hl,bc\r
+       jp      c,error\r
+       pop     hl\r
+       push    hl\r
+       push    bc\r
+       ldir\r
+       pop     bc\r
+       pop     hl\r
+       jp      (ix)\r
+\r
 ;-------------------------------------------------------------------------------\r
 ; > G [startaddr] [;breakp..]\r
 ;      Go [to start] [with temporary breakpoints]\r
@@ -1726,7 +2005,7 @@ cmd_X:
        call get_line\r
        call skipbl\r
        jr z,l0c30h\r
-       call sub_0363h\r
+       call get_arg_final\r
        ex de,hl\r
        pop bc\r
        pop hl\r
@@ -1998,11 +2277,11 @@ cmd_O:
        ret\r
 \r
 ;-------------------------------------------------------------------------------\r
-; > Vstartaddr endaddr targetaddr\r
+; > V startaddr endaddr targetaddr\r
 ;      Verify (compare) two memory areas\r
 \r
 cmd_V:\r
-       call sub_034eh\r
+       call get_arg_range_target\r
 l0dedh:\r
        push bc\r
        ld a,(de)\r
@@ -2034,7 +2313,7 @@ l0e10h:
 ;      Move memory\r
 \r
 cmd_M:\r
-       call sub_034eh\r
+       call get_arg_range_target\r
        call cp_hl_de\r
        jr nc,cmdm_up\r
        add hl,bc\r
@@ -2044,7 +2323,7 @@ cmd_M:
        dec hl\r
        dec de\r
        lddr\r
-       db 01h          ;swallow ldir instruction (ld bc,...)\r
+       ret\r
 cmdm_up:\r
        ldir\r
        ret\r
@@ -2143,9 +2422,9 @@ l0ed3h:
        ret\r
 \r
 sub_0ee6h:\r
-       ld hl,conbuf+1\r
+       ld hl,conbuf\r
        call sub_0ef7h\r
-       ld de,conbuf+1\r
+       ld de,conbuf\r
        and a\r
        sbc hl,de\r
        ld b,l\r
@@ -3723,8 +4002,50 @@ last_L:
 pbl_loop_adr:\r
        dw      0addeh\r
 \r
+;-------------------------------------------------------------------------------\r
+\r
+conbuf::\r
+       ds      CONBUF_SIZE+1\r
+\r
+;-------------------------------------------------------------------------------\r
+\r
+       rept    (STACK_SIZE+3)/4\r
+       db      0deh,0adh,0beh,0efh\r
+       endm\r
+stack::\r
+reg.l2:        db      000h\r
+reg.h2:        db      000h\r
+reg.e2:        db      000h\r
+reg.d2:        db      000h\r
+reg.c2:        db      000h\r
+reg.b2:        db      000h\r
+reg.f2:        db      000h\r
+reg.a2:        db      000h\r
+       db      000h\r
+reg.i: db      000h\r
+reg.iy:        dw      0000h\r
+reg.ix:        dw      0000h\r
+reg.f: db      000h\r
+reg.a: db      000h\r
+reg.c: db      000h\r
+reg.b: db      000h\r
+reg.e: db      000h\r
+reg.d: db      000h\r
+reg.l: db      000h\r
+reg.h: db      000h\r
+reg_sp:        dw      TPA\r
+reg.iff:\r
+       db      0f3h\r
+       db      0c3h\r
+reg.pc:        dw      TPA\r
+\r
+cmd_rpt:dw     mainloop\r
+\r
+;-------------------------------------------------------------------------------\r
+\r
 ddtz_size      equ     $-ddtz_base\r
-ddtz_end:\r
+prog_size      equ     $-start\r
+ddtz_end::\r
 \r
 ;-------------------------------------------------------------------------------\r
 \r