I'm trying to use this SafeCopy routine with port $2A when port $20 is set to 1.  However, I get problems that normally occur when one doesn't delay long enough for the LCD.  In other words, the delay port doesn't seem to be working.  Any suggestions?


safecopy2:
ld a, $87
out ($2A), a
ld c,$10
ld a,$80
setrow:
nop
nop
nop
nop
nop
;in b,(c)
;rl b
;jp c,setrow
out ($10),a
ld de,12
ld a,$20
col:
;in b,(c)
;rl b
;jp c,col
nop
nop
nop
nop
out ($10),a
push af
inc c
ld b,64
row:

rowwait:
;in a,($10)
;rla
;jp c,rowwait
ld a, (hl)
out (c), a
add hl,de
djnz rowwait
pop af
dec h
dec h
dec h
dec c
inc hl
inc a
cp $2c
jp nz,col

ret



Like calc84 said, you need quite a few cycles of delay in 15Mhz mode. To cover all LCDs, you'll probably have to get an upper range of 180 cycles per loop with your average lcd running at 150 cycles.

Your $87 gets divided by 4 and only comes out to 33 cycles. That plus your current 43 only leaves you with 76, and that is nowhere even close to what you need.

Try getting your main loop up somewhere around 120 and setting (2Ah) to $FF. That should give you 183 and will definitely work. From there, you can scale it down to your needs. However, you can't go lower than 123, but, that's ok I guess.

Hey, I don't know anything about calculator programming. I know C++, Objective C, and Adobe AS3 all fairly well... but I am completetly foreign to what you use to code for calculators. In fact, I don't even know what you use to code for it! I really need some help... can someone PM me? I really want to get started with it.