-
Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…
... ISR fetch from table addresses I*256+255 and I*256+256. For the ... by many is to use a 257 byte table containing the same byte value repeated ... 0x0038 address. This is how most Spectrum programmers use IM2 ... if attached IM2 peripherals pull up all the data bus ... -
I just picked up a free Atari 520stJust got a free 520ST, (no cables or leads) and a small box load of games. :? dunno what to do with it, but it was being thrown out, so I grabbed it…
... the other racing cars made up of layered sprites that ... how the ST could never achieve such a feat). It claimed to ... pointer (but it had to be on a 256 byte page boundary). There ... was a more sophisticated technique where ... -
I just picked up a free Atari 520stJust got a free 520ST, (no cables or leads) and a small box load of games. :? dunno what to do with it, but it was being thrown out, so I grabbed it…
... pointer (but it had to be on a 256 byte page boundary). There ... was a more sophisticated technique ... You don't happen to remember how the byte resolution trick (I assume ... if I can get up into the loft to retrieve my ST ... -
many scr files to tap fileguys, I know that threads like this have existed in the past, but i'm gonna try to get a video onto speccy. The +3e to be exact. figured i'd use full…
... to have a few scraps of the source code / notes / tools I used to ... create it, but from what I remember the code isn ... them to the screen or a 256-byte sound buffer, and stopping periodically to dump ... -
Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... interrupt vector table to force screen refresh to call my code)
...
3) Instead of putting cells from back buffer to ... screen I use a 256 byte buffer with ... screen addresses to update (generated ... -
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... that (or a 1.75K rotate table and mask it to get the ... save some memory by using a 256 byte mirror table (or generating one as ... this if I made the code more clevererfied) and any cells ... 've written a decompressor/compressor before and it wasn't fun to code ;) -
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... can optimise the inner loop to remove the push / pop ...
jp .nextbuffentry
[/CODE]
Should shave some ... /> ld a, h
xor #e0 ; #a000 maps to #4000 now ... align copybuf on a 256-byte boundary, you could speed that up as well. -
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
copybuff is aligned on a 256 byte boundary ;)
I align nearly everything. The sprite records and guardian instances are the only buffers that aren't aligned I think (would need to check). -
How do you destroy an enemy or object?Hi guys I allways wanted to know this, but how would you go about making and destroying enemies in basic or any language? What, do you use a huge ar…
... br /> I already know how to code in C so I traught ... people don't generate code in the form of ... br />
I forgot to mention the block memory allocator ... blocks. Allocating a certain size block is a simple matter of ... consumed. Overhead is one byte per block. -
Image to ZX Spec 1.1 Now Freely Available!Image to ZX Spec 1.1 Now Freely Available! [IMG]http://mirror.viperfang.net/silentdevelopments/images/ent-preview1.1.zx.png[/IMG][IMG]http://mirror.…
... know ASM/machine code I'm not sure how to write a BASIC program ... algorithms used :( I'm fully code documenting my Java source so ... other people can pick up any slack (notably byte manipulation in export ... -
JSpeccy: New emulatorHi there, Jos? Luis S?nchez (zx81 at ono dot com) has developed a new ZX Spectrum emulator in Java, with a very accurate Z80 emulation. The message …
... impressive. I had a very quick look and the code is simple enough ... to study the audio code as up until now I had no idea how to ... use Spectrum audio inside Java! A few more code comments ... us who have no idea how to write a full emulator :) -
New member here. And a spider! :)Hello everyone. My name is Sekrets. I'm quite a lonely individual, searching for a digital home where I might find fellow speccy enthusiasts to adopt…
... br /> If anyone wants to critisize my code, show me the error ... com/spidersource.pdf[/URL] to show how i've been approaching it ... I suppose you'll want to use a look up table for screen address mapping ... on the ROM disassembly. Well, look no further than [URL="ftp ... -
Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …
... to recycle various sprite parts, to save space, how ... to use something like a 256 byte lookup tables for mirroring and maybe a 512 byte table ... up with a standard or some rules for the sprite designers about how ... they are allowed to split the ... -
New Game: Heart StealerMy first platformer is finally released! Having a Speccy since a long time ago, I've really wanted to make a game for it. Since february, I've final…
... />
Love the 'arcade' look and feel to it, reminds me totally ... people "How to buy a burger in McDonalds" as an alternative to "How to Snare a Rabbit ... you'll have to resort to machine code in order to do that. ;)
'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
... the addresses from 61*256 up to (64*256)-1, contain bitmaps for ... bottom third. (The attribute table is at 88-90, but ... back to that later.)
[CODE]; A routine to print a text string to ... 's bitmap in ROM crosses a 256-byte boundary.
inc ...Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... />
[CODE];use alongside the print_char routine to set Attribute values ... to use A this way then set up something like ld a,( ... ;suggested use: ld a,"A"
; ld bc,184*256+249
; ... br /> ld e,a
;transfer Attribute Byte to e for easier ...Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …
... have set myself was to write a machine code double height character printing ... holiday I had a brain wave about how to write a double height character ... /> 110 LET CHARS=PEEK 23606+256*PEEK 23607: LET CHARS=CHARS ... +256
115 LET DTOP= ...Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …
... have set myself was to write a machine code double height character printing ... holiday I had a brain wave about how to write a double height character ... /> 110 LET CHARS=PEEK 23606+256*PEEK 23607: LET CHARS=CHARS ... +256
115 LET DTOP= ...Why was/is the ZX Spectrum so popular?Why? How? Even after all this time you have a website like this etc.... It's just amazing!
... .
IF you learned how to code assembler on it, it became ... the obvious cost... clivey look like a boffin... also the fact it ...Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... />
; --------------------------------------------------------------------------
[/code]
How does it work?
3) A 13 BYTE final clean-up routine must be placed ... end of memory as a terminator to save code space but the ...games that never lived up to the hypewas there ever any games u throught were good to play but when u played them u did not like them
... up and has to optimise programmer 1's code.. some peoples code is a ... they got a 2nd lot in to code a game in a few weeks ... complex and tough to port
look how long ikari warriors ... took to come out... ikari ...Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
... 's a snapshot of the code I came up with last ... for the movement and a 256 byte mirror table, the second set ... />
Reading the code again it looks like I ... right hand screen edge to prevent wraparound, like ... adding any more clipping code to the demo - life' ...Fuse: what do you want to see?An open brainstorm. If you had a team of programmers working on [url=http://fuse-emulator.sf.net/]Fuse[/url], what would you tell them to work on? …
... , with ASCII and hex/decimal byte/word views.
[/LIST]< ... br />
[LIST]
[*]A graphical watch window would be ... I do know how to code and could probably get up to speed with the ... source if there was a specific area of the code to target.Super Stick ManBeen thinking about doing a weird platformer for a while now, but since I have zero programming knowledge, and a modicum of drawing skills, I thought…
... to put together a decent demo now) and concentrate on learning how to code ... . Could take a bit of time though ... you will understand how hard it is to cram everything into ... I think it's about 256 of them at one time ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... or speed it was a 2am piece of code that gets overwritten ... some higher level code in the assembler to generate the table for me ... carrying a 256 byte table around with me.
Just remember to align your table to a ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... to be really smart, come up with a PASMO Macro that generates a 256-byte mirror table ... moving each bit to the right place:[code]
REPT 256, x
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... home, would be a guide on how to repair differing faults ( ... br />
[b]How to identify a faulty DRAM chip by visual ... every single bit in a byte from the contended memory ... provides information about how to compile the source code succesfully.
In ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... rotate2.tap[/url][/QUOTE]
How about:[code] di
... ld c,(hl)
ld a,(bc)
exx
... /> exx
ld (hl),a
inc l
... to avoid ISR, and BASIC-friendly wrapper. Supply your own look-up table ...
