... all 3 channels to produce a carefully controlled volume level. The ... my calculations you can get a pretty good approximation to 256 ... this method would give you a respectable 6 bits per ... lookup tables, I think translating a byte to the appropriate AY output ...

... working with individual bits in a byte; it is easier to split ... the byte down into two lots of ...

Ah - yes I see that now, no wonder I was getting confused.

I have also remembered that I can PRINT PEEK to examine the contents of a byte too.

I'll get there in the end!

Cheers

Jon

... LDI as it takes 16t/byte

ld (...),sp
a byte

16*2048=32768 ...

... LDI as it takes 16t/byte

ld (...), ... need only 13 t for a byte
[/quote]

... takes 12.5 T per byte but, as you say, ... memory makes it impractical for a basic 48K machine. However ... be worthwhile to consider a 30 byte wide x 96 vertical ...

... the Z80 reads a byte b from the data ... 3 tstates: read low byte from the interrupt vector.
byte and jump to interrupt routine ... M2: 3 tstates: write high byte and decrement SP.
* ... : 4 tstates: read high byte of 'nnnn' and decrement ...

... works, by simply having a larger screen in memory ... the screen starts displaying, a window is smoothly scrolled.[/ ... s only possible to step a byte (two pixels in 16 ... the Speccy... i have a fairly large collection of ... the hardware and, since a lot of those games ...

... wouldn't exactly call that a practical suggestion.

a possible solution:

a chance to use a different one (after a warning).< ... /> - T-state counter
- A byte-wise DIFF between the original ...

... user a chance to use a different one (after a warning).< ... /> - T-state counter
- A byte-wise DIFF between the original ... will also work in a significant number of cases ... all,or only for a very small number of ... I've tested quite a few with snaps made ...

... br /> - T-state counter
- A byte-wise DIFF between the original ... use, there will be a difference DELTA between the current ... reconstruct S1 given DELTA and a snapshot that is either exactly ... been loaded (abstracting for a moment from multi-level games ...

... [/quote]

That's a fundamentally flawed argument, I'm ... Having only two pixels per byte also drastically reduces the amount ... . The pixel encoding in a byte is specifically designed to make ... .

It takes a better programmer to make the ...

... , but it would still be a good idea and could come ... - all represented using colors in a window where each pixel is ... was used as a counter instead of a byte, to keep track of ...

... .e storing more data in a byte by using more bits.

... Like this it will cost a byte, but the printtable holds in ... jr c,print
add a,b
jr nc, ... />
It wins no byte, but it gives opportunities for ... I can skip a JR and might gain a byte.
After ... jr c,print
add a,b
call #22b0 ; ...

... 'm confusing a ULA memory read with a Z80 memory ... read.
The Z80 reads the first byte ... same thing but in a more direct way so ... Also, is this why a LD from a memory address takes at ... ULA can load a screen attribute byte and a byte of pixel data ...

... a Z80 memory read.
The Z80 reads the first byte ... would be stored in a different part of the ... , is this why a LD from a memory address takes at ... ULA can load a screen attribute byte and a byte of pixel data ... it should being doing a memory fetch to register ...

Using just a grain of salt, which sometimes ... used in those cases where a game detects 48K mode and ... 128K machines) and Lemmings (tests a byte in the ROM, very ugly ...

... value "13" stored as a byte, which would signal the end ... line. Unfortunately, the 5 byte form of the number 13 ... :)

This was a hangover from the old days ... allow you to save a file with the two ... br />
Fixed, and a new maintenance release is on ...

sure, but when you write a byte to the attributes, you are ... 'm going to look into a fast full-colour 8 way ...

sure, but when you write a byte to the attributes, you are ... 'm going to look into a fast full-colour 8 way ...

... ld hl.#8000
ld a,(hl)
ld hl,# ... 8002
adc a,(hl)
jr c ... /> loop ld a,0
ld (hl),a
jr ... loop2
loop1 ld(hl),a
loop2 ret
... a,0 should be xor a
as it is a byte ... less then ld a,0 ...

... br /> ;###

;## Decompress a pucrunched file.
;## In : HL ... inc hl

ld a, (hl) ; starting escape
... inc hl

ld a, (hl) ; number of escape ... br /> ld (noesc+1), a

ld a, (hl) ; maxGamma + ...

... , I think I've found a small typo in the draft ... specifies the pause parameter as a BYTE value. However, the offsets appear ... to indicate this should be a WORD?

Mike

... is fun, saves a byte or two, and saves a few clock cycles ... and IY registers to get a few more 8 bit registers ... to use, although there is a speed penalty with the instructions ... up overall faster (gave me a 30% speed up with Stratosphere ...

... is fun, saves a byte or two, and saves a few clock cycles ... of basics to start as a tip.

As for ...

... but it is just a happy consequence of carrying ... You were correct about decrementing a byte once and then again before ... so you will never see a '1' unless you ... br />
There is a disassembly on my site - see ... eight and six in a later verson. Does anybody ...

... . I have that. I think a lot of people learned Z80 ... at flipping the bits in a byte is that the high bit ... you could just do a subroutine that takes a byte value and:

... high entertainment :)
Is it a knackered tape image or could ... be something as simple as a byte (hoho!) gone wrong in the ...