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So what about ethernet and ZX BASIC?Well, as of about 5 minutes ago, ZX BASIC for the first time properly wrote some packets to the network! OK, so it isn't perhaps 100% what Andrew Ow…
... />
Spectrum streams work a byte at a time, which would ... whole packet just for each byte!) and very slow, so under ... on - each stream has a 256 byte buffer in a page of ... -
Moving a line down the display in assembler?...It's not a "[I]how can I do it[/I]" question, it's more a "am I missing something in trying to do it a new way" kinda question. What I've been doing…
... byte table (128 bytes of it wasted) - ie. two tables of 256 ... on the start of a 256 byte page.
So, ... rrca
ld h,SCRTABLE/256
add a,(hl)
ld h,SCRTABLE/256
add a,(hl)
CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
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ld h,c ; t = 256 * y
ld l,b ... /> ld d,h ; c = t / 256
ld (rnd+1 ... /> ld a,l ; x = t % 256
cpl ; x = (b-1 ... . Having the table aligned to 256 byte boundary could be used to ...Rendering clipped glyphSometimes you need to render a glyph of arbitrary size to the screen. And clip it. For example: drawing a mouse cursor means combining drawing of a…
... /> glyph_t *glyph,
byte x,
byte y,
rectangle_t *clip_rect ... trick with two tables on 256 byte boundary for fastest vmem ... to point 12 then first byte mask will be 11111110 ... and end byte mask will be 00000111. ...hash function permutation tableI'm using a simple Pearson hash function to generate keys for a $(103,6) array using a 256-byte permutation table. How do I arrange the entries in th…
... $(103,6) array using a 256-byte permutation table. How do I ... a lot of them in 256 numbers so trial & error ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... 48640 (190*256) and point to 191*256+191 = 49087 ... table to go at 190*256 = 48640..48896
... ;Jump to 191*256+191 = 49087
ld ... (hl),191
ld bc,256
ldir
... />
ld h,pixel_address_A/256
sla c
ld ...Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…
... (i.e. a table on 256 byte boundary) I have optimal memory ...Spectrum Screen RAM layoutHi there The spectrum screen layout is rather odd. It seems to be arranged into 3 256 byte groups. If I have an x (horizontal) coordinate (from…
... to be arranged into 3 256 byte groups.
If I ...Horizontal scrollDoes anyone know how to do a 2 or 4 pixel left or right horizontal scroll of the spectrum screen. I can make a 1 one pixel scroll with: ... rl (hl…
... say you would have a 256 byte table and do something like ... H,table ; point to a 256 boundary table
LD A ...Horizontal scrollDoes anyone know how to do a 2 or 4 pixel left or right horizontal scroll of the spectrum screen. I can make a 1 one pixel scroll with: ... rl (hl…
... at the end of a 256-byte boundary (both Spectrum screens are ...Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... is pointed at by h*256 and not hl if we ... table must start on a 256-byte boundary.
This looks ... so slightly (10 cycles per byte or around 12%).Huffman questionI'm pretty sure that the answer to my question is "no", but I just want a second opinion: Is it possible to somehow cram a Huffman decompressor + de…
... decompressor + decoding tree (for 256 elements) into only 400 bytes ... />
If you used one byte per symbol in a table ... would have enough information in 256 bytes to completely construct ... can tolerate more error the 256 byte table can be shrunk. When ...Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…
... Usually this is a single-byte RST instruction that performs a ... />
Effectively I*256 points at a 256 byte table containing interrupt service ... I*256+255,I*256+256. So the Spectrum needs a 257 byte ... every byte of the 257-byte table pointed at by I*256 ...i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…
... if adress pointer is crossing 256 byte page and you must use ...Basic corruptionDoes anyone have any tips or solutions for when a Basic listing becomes over a certain size and starts to get corrupted due to paging... I remember …
... is attached) then a random 256-byte page of memory will be ...Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
... can put lineptrs on a 256-byte boundary and rearrange it into ... 256 low bytes followed by 256 high bytes. This ... /> [code]
ld h,lineptrs / 256
ld l,d
Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
... ,B
LD H,LINEPTRS/256
ADD A,(HL)
256 byte boundary.
If you ... at the beginning of a 256 byte page, say at 64000, you ...
LD D,PIXELTAB/256
LD E,A
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... up the table for every byte, which is fairly time consumming ... dealing with only 256 bytes. Each of this 256 byte tables is organized ... in a such way, that the byte ... a,(de) (taking from memory byte needed to shift)
ld ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... the beginning of
;a 256 byte page makes addressing it
;mask byte, sprite byte, mask byte, sprite byte... and so on.)
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... DE cause u never cross 256 byte boundary. so INC E/DEC ... /> l1: draw one byte
l2: draw one byte
l3: draw ... one byte
[/code]
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... at the start of a 256 byte page
* Requires 512 ... start of the next
* 256 byte page.
SCRTAB EQU ... first 256 bytes
* containing the left half of the shifted byte ... and the
* second 256 bytes containing the ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... , only when your crossing a 256 byte boundary: INC L is sufficent ...Smooth Screen ScrollingHi Everyone, Any suggestions on what is the best way to do horizontal scrolling ie. in Zynaps fashion. I am working on a routine at the moment, whi…
... or c ; merge with low byte.
jp nz,scrol0 ; ... 256 times:
scrol0 rl (hl) ; scroll byte ... know exactly where the 256-byte boundaries are within each ... aligned exactly on a 256-byte boundary, so the routine ...Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…
... map data is inside a 256 byte boundary. I now set the ... />
ORG 51200 ; MUST BE 256 BOUNDRY
MAPLOOKUP DEFW TILEIMAGE0 ...Map to screen address problemCan anyone help me out with what I guess is a screen address calculation problem. I need to calculate the screen address of a tile based on a number…
... , and if your table contains 256 entries or less (this one ... ), it's worth using separate 256-byte blocks for all the entries ...Help, my Sprite Code wont workI have zipped it all up here: [url="http://www.peargames.co.uk/downloads/galagorf.zip"]http://www.peargames.co.uk/downloads/galagorf.zip[/url] If y…
... screen line as the high byte won't change on a ... wide so it crosses a 256 byte boundary mid line. Try changing ...Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... the expense of a 512 byte lookup table, you might want ... has to be on a 256-byte boundary, of course.
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... begin on an exact 256-byte page, which means the ... array is a 512-byte table of pointers. Each ... begin at an exact 256-byte page, meaning the LSB ... actually two 256 byte arrays, with the first 256 bytes containing ... address and the next 256 bytes containing the MSB. ...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... read a subroutine address of byte*256+byte. Since the peripheral id can ... must begin on an exact 256-byte page, meaning the least ... the z80 will always read byte*256+byte as the address of the ... A "0" would make a 256-byte table, which is appropriate for ...
