Modified read and write for writing up to 255 bytes

src/bas/mlloader.bas

@@ -15,7 +15,7 @@
 140IF S=0 GOTO 100
 150GOTO 20
 999END
-1000REM Converts the value of N into a hex-string and stores the result in N$
+1000REM Converts the value of N into a hex-string and stores the result in H$
 1010H$=""
 1020FOR I=3 TO 0 STEP -1
 1030A=15:IF I=3 THEN A=7
@@ -25,12 +25,74 @@
 1070NEXT I
 1080H$=H$+"H"
 1090RETURN
+1100REM Converts a hex-string into integer. Expects the value in H$ and stores in N
+1110N=0
+1120FOR I=0 TO 3
+1130T$=MID$ (H$,LEN H$ - I,1)
+1140IF ASC(T$) > 57 THEN N=N+(ASC(T$)-55)*(16^I):GOTO 1160
+1150N=N+(ASC(T$)-48)*(16^I)
+1160NEXT I
+1170RETURN
 2000REM Loads a memory area from file
 2010S=2000
+2020CLS
+2030PRINT "LOAD FROM FILE"
+2040INPUT "Start address: ";H$
+2050GOSUB 1100
+2060A=N
+2070INPUT "End address: ";H$
+2080GOSUB 1100
+2090B=N
+2100INPUT "Filename: ";H$
+2110WAIT:PRINT "Press PLAY on Tape"
+2120WAIT0:PRINT "Loading ";H$
+2130DIM V(B-A)
+2140OPEN "CAS:"+H$ FOR INPUT
+2150INPUT#1,V
+2160CLOSE
+2170FOR I=A TO B
+2180POKE I,V
+2190NEXT I
 2999RETURN
 3000REM Saves a memory area to disk
 3010S=3000
+3020CLS
+3030PRINT "SAVE TO FILE"
+3040INPUT "Start address: ";H$
+3050GOSUB 1100
+3060A=N
+3070INPUT "End address: ";H$
+3080GOSUB 1100
+3090B=N
+3100INPUT "Filename: ";H$
+3110WAIT:PRINT "Press RECORD on Tape"
+3120WAIT0:PRINT "Saving ";H$
+3130DIM V(B-A)
+3140FOR I=1 TO B-A
+3150V(I)=PEEK(A+I-1)
+3160NEXT I
+3170OPEN "CAS:"+H$ FOR OUTPUT
+3180PRINT#1,V
+3190CLOSE
 3999RETURN
 4000REM Compares a memory area with the file on disk
 4010S=4000
+4020CLS
+4030PRINT "VERIFY FILE"
+4040INPUT "Start address: ";H$
+4050GOSUB 1100
+4060A=N
+4070INPUT "End address: ";H$
+4080GOSUB 1100
+4090B=N
+4100INPUT "Filename: ";H$
+4110WAIT:PRINT "Press PLAY on Tape"
+4120WAIT0:PRINT "Loading ";H$
+4130DIM V(B-A)
+4140OPEN "CAS:"+H$ FOR INPUT
+4150INPUT#1,V
+4160CLOSE
+4170FOR I=1 TO B-A
+4180IF V(I) <> PEEK(A+I-1) THEN PRINT "Error at address ";A;" Expected ";PEEK(A+I-1);" GOT ";V(I):BREAK
+4190NEXT I
 4999RETURN