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InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…
... *256. The peripheral supplies a single byte identifier that indexes into this table ... a table lookup at address I*256+255/I*256+256, meaning the table must ... same byte in the entire table. Eg: from i*256 through i*256+256 inclusive ... -
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…
... 'd definitely use a lookup table for speed instead of the ... at the start of the table (with interrupts disabled of course ... SP here, and if your table contains 256 entries or less (this ... ), it's worth using separate 256-byte blocks for all the entries ... -
DocumentationI'm sure someone has already answered this, but I'm new to these forums. Could someone provide me with documentation about how data is stored in ZX …
... :
* A flag byte: 0x00 for header blocks, 0xff ... the block (including the flag byte) produces 0x00.
... can't be bothered to look up at the moment).
* ... of block.
* Checkbittoggle (1 byte).
[ This Message ... -
sprite making in +3 BASIC?Any sprite tutorial I come across is far too complicated! Can someone help me? For instance, how do you create a person-shaped animated sprite which …
... not practical with a dial-up modem connection (I tried it ... one page, so I gave up - although, as I have all ... , here's the pages to look up:
SU#76 (Jul ... at the bottom, although the "Table 1" assembler listing referred to ... -
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 to ... has to be on a 256-byte boundary, of course.
Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... register I=47665/256=186. The interrupt vector table will be located ... at address 256*186=47616 ... and should contain 257 identical bytes. If the byte ... is 'X', the interrupt will jump to address X*256 ...Assistance with IM2 routineI subsequently got a working IM2 routine.
Set I to $fd; the table at $fd00 should be filled with $fe bytes (257 of them) so it will look up an address anywhere in that table and jump to $fefe.The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... might be able to speed up the 6502 version using self ... sorted lie in the same 256-byte page. Are you not? (Better ...Graphics in Basic??What is the fastest way to draw high rez graphics in Basic. Andrew.
... QUOTE]
Fire up BASin, look at the spectrum manual, the ... POKEing the data somewhere high up. Then set CHARS (using ... to your set - 256. You can define up to 96 characters, which ... program under regular emulation will look quite unreadable until you ...The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
To set up an interrupt service routine ... you need to set up a vector table - this is 257 ... So when you've set up your table, and your interrupt routine ... is the high-byte address of your table), and then IM ... a "DI" when setting up your interrupts... you should be ...The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…
... ]
Another thing to look up, great
[QUOTE]
256 color "hires" mode ( 512x192 ). But ...Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…
... !
Here's the table
9030 F0
2 bytes each. 1st byte distance. 2nd byte direction (FF=up,01=down)Database + web programming queryI was thinking of the best way to implement the a book type-ins database thingy, and I thought something along these lines would be nice and simple: …
... programs column and add another table that associates programs and books ... /> 2. book_id (corresponds to book table's unique id)
3 ... book you look up all matches to book_id in the programs table.
Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…
... the low byte holding the fractional part. Trig used look-up tables with ... 8 data and 1 attr byte for each used block. Room ... the gameplay more than makes up for it ;-)
There ...Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…
... the low byte holding the fractional part. Trig used look-up tables with ... 8 data and 1 attr byte for each used block. Room ... the gameplay more than makes up for it ;-)
There ...Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…
... the low byte holding the fractional part. Trig used look-up tables with ... 8 data and 1 attr byte for each used block. Room ... the gameplay more than makes up for it ;-)
There ...Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…
... the low byte holding the fractional part. Trig used look-up tables with ... 8 data and 1 attr byte for each used block. Room ... the gameplay more than makes up for it ;-)
There ...Vote for the change of TZX formatThere is an ongoing discussion on the proposal of Patrik Rat to change the current TZX format specification to one that is simpler to implement for e…
... InjectaLoad - 18 pulses per byte (9 waves), 256 char alphabet
byte only uses up two pulses), also ... Cyberlode - 18 pulses per byte (9 waves), 256 char alphabet
< ... br /> Contended Loader - 256 char alphabet, A LOT different ...Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... sprite data to be aligned on a 256 byte page boundary (so instead ...Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…
... to the screen or a 256-byte sound buffer, and stopping periodically ... . Similarly, you can make translation table from 8-bit to 4 ...Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…
... the low byte holding the fractional part. Trig used look-up tables with ... 8 data and 1 attr byte for each used block. Room ... the gameplay more than makes up for it ;-)
There ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... int_seed" is the two-byte integer stored at address ... file stores pixels one byte after the other horizontally ... characters terminated by a zero byte). [I]s[/I] ... it may be time to look up a C tutorial on ... right halves of each fatted up UDG byte.
...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... ;hl now holds the 8 byte aligned scrn address
pop af ... ;increment h to pixel line aligned address
dec a
table with 192 addresses but got ... 24 address table with each address representing a 8 byte aligned Y address ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... player structure would only look at the first 32 ... the player owns you'd look at "numPlots[COMMODITY_FOOD]".
look at all 45 ... return value a single byte that indicates up, down, left, ... player #0 we pick up the corresponding "struct player ...IM instruction - danger Will Robinson!!! :)Here's something I've wondered about for years: On page 102 of "Mastering Machine Code on your Zx Spectrum" by Toni Baker, there's an instruction li…
... that as the high-byte of a lookup table, which in turn ... /> Hope that helps. Have a look in the SinclairFAQ for information ...Spectrum Review Book is all systems go ![url]http://www.spectrumgamesbible.co.uk/[/url] We've created a small website for the series of books we are looking to create for the Speccy featur…
... valuable time under the table to get a good look up some skirts.Spectrum Review Book is all systems go ![url]http://www.spectrumgamesbible.co.uk/[/url] We've created a small website for the series of books we are looking to create for the Speccy featur…
[QUOTE=mile;251566]ah she is wearing an amusing t-shirt. :)
remember dropping a pen can give you valuable time under the table to get a good look up some skirts.[/QUOTE]
you dirty wee bast! :lol:Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …
... within 256 bytes of the associated OPEN and CLOSE stream look-up tables ... channel and buffer on demand - up to thirteen such channels if ... no default printer buffer were 256 bytes further down in memory ... well thought out and I look forward to seeing the fruits ...ANN: ColorPRINTColorPRINT gives you 256 fully programmable Timex mode 2 characters (maximum 16 colours per character if you have bright black) to use in your 48 BAS…
... a single attribute byte as an identifier to look up the colour udg ... value that is used to look up the 8 colours just as ... is used to look up the 8 bytes making up the graphic.
byte to locate the eight attribute ...
