... corrupt, then restore, the original byte.

So ... bits you want to keep from that first byte, and sets ... the other bits to zero. ... them with the original byte, meaning pairs of bits ... one end of the byte to the other (GHEF DCBA ...

... /> ;; IX:target address of next byte to load.

loader_entry:
to be read
ld a,d ; place high byte into ... ; XOR with byte just read
;; use routine to advance pointer if ...

... now, but saved another byte and speeded up the line ... b,#XX 06XX ;Hi Byte of Lookup table 7
byte to lhs 7
inc l ... (de),a 1A ;copy flipped byte to rhs 7
dec e ... 1D ;move left to next byte 4
test e

... and c ; combine with byte being loaded (4T)
... and h ; combine with byte being loaded (4T)
... of the byte read from port 0xFE to detect the ... first bit in each byte to take the overhead of ...

... br /> Switch S1 is used to set start page - A for ... board programmatically - just write byte to any memory address below ... /> bit 7 is used to disable onboard ROM (switch ... P.S. I was able to switch from [url=https:// ... basic IV[/url] back to original basic by POKE ...

... /> add a,c ; add the byte just read
adc a ... ,h ; add the low byte to the high byte
adc a,0 ... h ; combine with the high byte
add a,1 ; ...

... received the final checksum byte, it ignores all further ... id=0004849"]Starbike[/URL] springs to mind.

byte in the machine code ... the speed, and one byte to correct the checksum. So ... 2000 baud uses similar timings to the ROM loader

... 3321 bytes (with an extra byte to indicate the total number of ... levels up to 40). Afterwards they could ... customized new game, without having to "hack" anything or even ... structure and even documented how to replace levels and customize ...

... needs are for the attribute byte to be changed before the display ... of the display byte that you want to change to toggle from 0 ... to 1

I ... when scrolling too, partly down to the attribute ordering but something ...

... needs are for the attribute byte to be changed before the display ... of the display byte that you want to change to toggle from 0 ... to 1

I ... when scrolling too, partly down to the attribute ordering but something ...

... Initialise the 'parity matching'
byte to zero.
LD B,+B0 ... 'parity matching' byte has to be updated with each new byte.

... br /> ld h, 0 ; parity byte to zero
ld a, c ... ; jump if first byte
jr nc, ld_verify ; jump to verify
jr ld_next ; next byte

org 0x05b3
rra ; shift the byte
ret nc ; return with ...

... this board programmatically - just write byte to any memory address below 0x1000 ... ]

You want to be careful with that as ... the original ROM actually tries to overwrite itself.

[ ... usable state if you switch to the original ROM. You should ...

... over the idea of up to 8 joysticks, using IN 31 ... low bit in the high byte to select one of eight ports ... paradox. No-one's going to build an interface unless there ... , and there's not going to be a game without the ... I need a quick way to make a new interface out ...

... over the idea of up to 8 joysticks, using IN ... low bit in the high byte to select one of eight ... . No-one's going to build an interface unless there ... real hardware. Adding support to an emulator and then coding ... there's a reason to go into production.[/QUOTE] ...

... /> call fp_to_a ; get data byte (bit 7 ignored)
... /> call fp_to_a ; get register byte
cp 17 ; check ... /> ld c, (hl) ; sign byte to C
inc hl ; next ... hl) ; low byte to B
ld a, b ; low byte to A

... /> ld l, (ix + 0) ; next byte to save

org 0x0505 ... br /> jp nz, sa_loop ; to include parity byte
ld b, 59 ... br /> ld h, 0 ; parity byte to zero
ld a, c ... jump if first byte
jr nc, ld_verify ; jump to verify

... , a ; low byte to E
inc hl ; point to high byte
ld ... byte
inc hl ; point to next byte
ld a, e ; low byte to ... byte
inc hl ; point to next byte
ld a, d ; high byte to ...

... /> ld a, d ; next byte to A
cpl ; ones complement ... /> ld a, e ; next byte to A
cpl ; ones ... /> ld d, a ; last byte to D
exx ; swap ... normalized
rlca ; fifth byte to A
rl e ; ...

... hl ; point to second byte
ld d, (hl) ; second byte to D
ld e, (hl) ; third byte to E
dec hl ; point ...
ld e, d ; byte to E
ld d, 0 ... /> ld a, (hl) ; first byte to A
and a ; large ...

... a, (de) ; first byte of screen to A
xor (hl ... br /> ld a, (de) ; byte to A
xor (hl) ; test ... /> ld a, (hl) ; attribute byte to A
jp stack_a ; put ... hl ; pointer to HL
dec hl ; last byte added
...

...
ld a, c ; discriminator byte to A
cp %11000000 ; checking ... /> ex de, hl ; first new byte to HL
inc de ; second ... to start of name to HL
dec de ; pointer to first new byte to ...

...
ld a, c ; discriminator byte to A
ld l, b ... /> ld d, c ; least significant byte to D
xor a ; LD ... /> ld c, b ; most significant byte to C
call stk_store ; stack ...

... ), a ; store second byte
dec hl ; point to first byte
ret ... ) ; get first byte
inc hl ; point to second byte
or (hl ... /> ld (hl), a ; set third byte to one or zero
rra ...

... byte of line number
ld a, (hl) ; copy to ... , (mem) ; address least significant byte
ld de, 15 ; ... ld a, h ; most significant byte to H
cp 0x40 ; line ... /> in a, (ula) ; read byte
rra ; set carry if ...

... to clear
ld b, h ; byte count
ld c, l ; to ...
ld bc, 64 ; byte count
ldir ; copy bytes ... ; set kstate to 255
ld c, 14 ; byte count
... /> ld a, b ; high byte to A
cp 0x40 ; less ...

... add one for the inclusive byte
add hl, de ... a, (hl) ; most significant byte to A
and %11000000 ; ... inc hl ; HL points to first displaced byte
ret ; ... dec hl ; point to first data byte
ret ; end ...

... hl) ; most significant byte of line number to A
cp 64 ... /> ld a, (hl) ; low byte to A
dec hl ; restore ... /> ld a, (hl) ; first byte to A
cp 64 ; next ... add hl, bc ; point to first byte of next item
pop ...

... h, a ; high byte to H
ld de ... a, h ; attribute byte to A
rrca ; ...

... br /> I always wanted to try to draw people of this size ... in gimp for making 1 pixel edge masks: I select ... the selection by 1 pixel, and draw that as ... in 3d animation, but learning to pixel-animate too :D
... than using lines. Try to draw your pixels using ...