ZX Basic 1.4 (beta) is out

[apenao]

I tried again with the Double Size Print routine in the library, this is the code:

Code:

CLS
doubleSizePrintChar(0,0,145)

doubleSizePrint(10,0,"Hello World")


STOP

SUB doubleSizePrintChar(y AS UBYTE, x AS UBYTE, thingToPrint AS UBYTE)
' Prints a single character double sized.
' Takes X and Y values as character positions, like print.
' takes an ascii code value for a character.
' By Britlion, 2012.

ASM
LD A,(IX+5)     ;' Y value
CP 22
JP NC, doubleSizePrintCharEnd

;' A=y value
LD E,A
AND 24             ; calculate
OR 64             ; screen
LD H,A             ; address
LD A,E             ; FOR
AND 7             ; row
OR a             ; Y
RRA
RRA
RRA
RRA
LD E,A

LD A,(IX+7)     ;' X Value
CP 30
JP NC, doubleSizePrintCharEnd

ADD A,E            ;' correct address for column value. (add it in)
LD L,A
EX DE,HL        ;' Save it in DE

LD A,(IX+9)     ;'Character

CP 164         ;' > UDG "U" ?
JP NC, doubleSizePrintCharEnd

CP 32          ;' < space+1?
JP C, doubleSizePrintCharEnd

CP 144         ;' >144?
JP NC, doubleSizePrintCharUDGAddress

LD L,A
LD H,0

ADD HL,HL
ADD HL,HL
ADD HL,HL    ;' multiply by 8.
LD BC,(23606)    ;' Chars
ADD HL,BC     ;' Hl -> Character data.
EX DE,HL    ;' DE -> character data, HL-> screen address.
JP doubleSizePrintCharRotateLoopCharStart

doubleSizePrintCharUDGAddress:
LD HL,(23675)    ;'UDG address
SUB 144
ADD A,A         ;multiply by 8.
ADD A,A
ADD A,A
ADD A,L
LD L,A

JR NC, doubleSizePrintCharUDGAddressNoCarry
INC H
doubleSizePrintCharUDGAddressNoCarry:

;' At this point HL -> Character data in UDG block.
EX DE,HL ;' DE -> character data, HL-> screen address.

doubleSizePrintCharRotateLoopCharStart:
LD C,2 ;' 2 character rows.
doubleSizePrintCharRotateLoopCharRowLoopOuter:
LD b,4 ;' 4 source bytes to count through per character row.
doubleSizePrintCharRotateLoopCharRowLoopInner:
   PUSH BC

   LD A,(DE) ;' Grab a bitmap.
   PUSH DE

   LD B,4
   LD C,A ; Copy BYTE so we can put two into the big version.
   doubleSizePrintCharRotateLoop1:
      RRA  ; one bit into carry
      RR E ; one bit into result
      RR C ; same bit into carry again
      RR E ; duplicated bit into result
   DJNZ doubleSizePrintCharRotateLoop1

   LD B,4
   doubleSizePrintCharRotateLoop2:
       RRA
       RR D ; Other register FOR other half of big 16 bit line.
       RR C
       RR D
   DJNZ doubleSizePrintCharRotateLoop2

   LD (HL),D    ;' Output first byte
   INC HL    ;' Move right
   LD (HL),E    ;' Second half.
   DEC HL    ;' Move left
   INC H    ;' Move down
   LD (HL),D    ;' Output second row (copy of first), first byte.
   INC HL    ;' Move right
   LD (HL),E    ; Output second row, second BYTE
   DEC HL    ; Move left
   INC H    ; Move down.
   POP DE
   INC DE
   POP BC
DJNZ doubleSizePrintCharRotateLoopCharRowLoopInner
; CALL __DECY+2     ;'Jump into the DRAW next_line_down routine, at a convenient point (accounting for the INC H above)
; Can't seem to call to this at the moment! Here in longhand form:

ld a, h
AND 7
jr nz, doubleSizePrintCharRotateNextCharRow
ld a, l
add a, 32
ld l, a
jr c, doubleSizePrintCharRotateNextCharRow
ld a, h
SUB 8
ld h, a

doubleSizePrintCharRotateNextCharRow:

DEC C
JR NZ, doubleSizePrintCharRotateLoopCharRowLoopOuter

doubleSizePrintCharEnd:
END ASM
END SUB

SUB doubleSizePrint(y AS UBYTE, x AS UBYTE, thingToPrint$ AS STRING)
'Uses doubleSizePrintChar subroutine to print a string.
'By Britlion, 2012

   DIM n AS UBYTE
   FOR n=0 TO LEN thingToPrint - 1
      doubleSizePrintChar(y,x,CODE thingToPrint$(n) )
      x=x+2
   NEXT n
END SUB

It compiles ok and Works in the previous versión. In the new versión, it compiles ok (doesn't show any warning or message) but doesn't work (at least in my emulator, Specemu). It shows just one character and then freeze.