More cleanup of ASM

rom/defines.s

@@ -1,11 +1,8 @@
-; extra/override ZP variables
-USR                           := GORESTART ; XXX
-
 ; constants
 SPACE_FOR_GOSUB               := $3E
 STACK_TOP                     := $FA
-WIDTH                         := 80
+WIDTH                         := 80 ; Default terminal width
-WIDTH2                        := 30
+WIDTH2                        := 70 ; mac column for zoned print
 RAMSTART2                     := $0400
 
 BYTES_FP                      := 5
@@ -16,12 +13,10 @@ BYTES_PER_FRAME := 2*BYTES_FP+8
 FOR_STACK1                    := 2*BYTES_FP+5
 FOR_STACK2                    := BYTES_FP+4
 
-MAX_EXPON = 10
-
 STACK                         := $0100
 STACK2                        := STACK
 
-INPUTBUFFERX = INPUTBUFFER & $FF00
 
+MAX_EXPON = 10
 CR = 13
 LF = 10

rom/float.s

@@ -46,12 +46,7 @@ LD758:
         ldx     #$0A
 LD75A:
         lda     MICROSOFT-1,x
-        and     #$3F
+        jsr     MONCOUT
-        sta     (LINNUM),y
-        iny
-        bne     LD766
-        inc     LINNUM+1
-LD766:
         dex
         bne     LD75A
         dec     FORPNT

rom/init.s

@@ -29,12 +29,12 @@ COLD_START:
       sta     GORESTART
       sta     GOSTROUT
       sta     JMPADRS
-      sta     USR
+      sta     GORESTART
 
       lda     #<IQERR
       ldy     #>IQERR
-      sta     USR+1
+      sta     GORESTART+1
-      sty     USR+2
+      sty     GORESTART+2
       lda     #WIDTH
       sta     Z17
       lda     #WIDTH2
@@ -81,49 +81,6 @@ L4098:
       sta     MEMSIZ
       lda     #>$BC00
       sta     MEMSIZ+1
-      jmp     L4106
-      jsr     NXIN
-      stx     TXTPTR
-      sty     TXTPTR+1
-      jsr     CHRGET
-      cmp     #$41
-      bne     SKIPPED
-      jmp     PR_WRITTEN_BY
-SKIPPED:
-      tay
-      bne     L40EE
-      lda     #<RAMSTART2
-      ldy     #>RAMSTART2
-      sta     TXTTAB
-      sty     TXTTAB+1
-      sta     LINNUM
-      sty     LINNUM+1
-      ldy     #$00
-L40D7:
-      inc     LINNUM
-      bne     L40DD
-      inc     LINNUM+1
-L40DD:
-      lda     #$55 ; 01010101 / 10101010
-      sta     (LINNUM),y
-      cmp     (LINNUM),y
-      bne     L40FA
-      asl     a
-      sta     (LINNUM),y
-      cmp     (LINNUM),y
-      bne     L40FA; new: slower
-      beq     L40D7
-L40EE:
-      jsr     CHRGOT
-      jsr     LINGET
-      tay
-      beq     L40FA
-      jmp     SYNERR
-L40FA:
-      lda     LINNUM
-      ldy     LINNUM+1
-      sta     MEMSIZ
-      sty     MEMSIZ+1
       sta     FRETOP
       sty     FRETOP+1
 L4106:
@@ -134,6 +91,10 @@ L4106:
       stx     TXTPTR
       sty     TXTPTR+1
       jsr     CHRGET
+      cmp     #'A'
+      bne     :+
+      jmp     PR_WRITTEN_BY
+:
       tay
       beq     L4136
       jsr     LINGET
@@ -178,6 +139,9 @@ L4192:
       lda     #<QT_BYTES_FREE
       ldy     #>QT_BYTES_FREE
       jsr     STROUT
+      lda     #<QT_BASIC
+      ldy     #>QT_BASIC
+      jsr     STROUT
       jsr     SCRTCH
       lda     #<STROUT
       ldy     #>STROUT
@@ -190,20 +154,18 @@ L4192:
       jmp     (GORESTART+1)
 
 QT_WRITTEN_BY:
-      .byte   CR,LF,$0C ; FORM FEED
+      .byte   CR,LF
       .byte   "WRITTEN BY WEILAND & GATES"
+      .byte   CR,LF
+      .byte   "PORTED BY KILIAN KURT HOFMANN"
       .byte   CR,LF,0
-QT_MEMORY_SIZE:
-      .byte   "MEMORY SIZE"
-      .byte   0
 QT_TERMINAL_WIDTH:
       .byte   "TERMINAL "
       .byte   "WIDTH"
       .byte   0
 QT_BYTES_FREE:
       .byte   " BYTES FREE"
-      .byte   CR,LF,CR,LF
+      .byte   CR,LF,0
 QT_BASIC:
-      .byte   CR,LF
       .byte   "COPYRIGHT 1977 BY MICROSOFT CO."
-      .byte   CR,LF
+      .byte   CR,LF,CR,LF,0

rom/program.s

@@ -215,7 +215,7 @@ PARSE_INPUT_LINE:
         ldy     #$04
         sty     DATAFLG
 L246C:
-        lda     INPUTBUFFERX,x
+        lda     $200,x
         cmp     #$20
         beq     L24AC
         sta     ENDCHR
@@ -248,7 +248,7 @@ L2496:
 L2497:
         inx
 L2498:
-        lda     INPUTBUFFERX,x
+        lda     $200,x
         sec
         sbc     TOKEN_NAME_TABLE,y
         beq     L2496
@@ -283,7 +283,7 @@ L24C1:
 ; BY COPYING CHARS UP TO ENDCHR.
 ; ----------------------------------------------------------------------------
 L24C8:
-        lda     INPUTBUFFERX,x
+        lda     $200,x
         beq     L24AC
         cmp     ENDCHR
         beq     L24AC
@@ -304,7 +304,7 @@ L24DB:
         bpl     L24DB
         lda     TOKEN_NAME_TABLE,y
         bne     L2498
-        lda     INPUTBUFFERX,x
+        lda     $200,x
         bpl     L24AA
 ; ---END OF LINE------------------
 L24EA:

rom/token.s

@@ -65,7 +65,7 @@ UNFNC:
         keyword_addr "SGN", SGN, TOKEN_SGN
         keyword_addr "INT", INT
         keyword_addr "ABS", ABS
-        keyword_addr "USR", USR, TOKEN_USR
+        keyword_addr "USR", GORESTART, TOKEN_USR
         keyword_addr "FRE", FRE
         keyword_addr "POS", POS
         keyword_addr "SQR", SQR

rom/trig.s

@@ -105,8 +105,8 @@ POLY_SIN:
         .byte   $E7,$28,$83,$49,$0F,$DA,$A2
 ; PET encoded easter egg text since CBM2
 MICROSOFT:
-        .byte   $A1,$54,$46,$8F,$13,$8F,$52,$43
+        .byte   "!TFOSORCIM"
-        .byte   $89,$CD
+        .byte   0
 
 ; ----------------------------------------------------------------------------
 ; "ATN" FUNCTION

src/main.c

@@ -46,7 +46,7 @@ int main(void) {
 
   printf("6502PC Emulator with MS Basic\n");
   printf("CTRL + G to exit\n");
-  printf("DF6FR to jump to BASIC\n");
+  printf("DF6AR to jump to BASIC\n");
 
   clock_gettime(CLOCK_MONOTONIC, &emulationStart);