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  • 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 …

    Using a shifted byte table makes a lot of sense. I had always been stumped about how to do large sprites. Even for small sprites preshifting them uses a lot of memory.
    Good idea Moroz.
    dmsmith dmsmith August 2004 Development
  • Emulator for Sale on eBay ?Hi folks, [url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=50223&item=8124480344&rd=1"]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem…

    Looks like this chap has now "ended this listing early because of an error in the listing." :p

    Hoorah etc! :D
    jil jil August 2004 Emulators
  • AmericaI've been wondering, was the Spectrum released in America? Was it popular? Are there Spectrum games that were made in America? There must be a few A…

    ... /> Considering the cost of memory at the time and the ... allow expansion of up to 16MB of memory in 64K ... chunks. You can get a handle on some of ... a concept of 3 64K internal memory banks -- the ... enumerated the expansion memory and would use ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Games
  • Emulator for Sale on eBay ?Hi folks, [url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=50223&item=8124480344&rd=1"]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem…

    ... "ended this listing early because of an error in the listing." :p ... disabled and had never heard of WOS...

    Ah well ...
    rich_chandler rich_chandler August 2004 Emulators
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... perfect when you run out of memory. for example in a shoot ... but you have only 48k of ram. on other side, only ... routine is really good piece of code. i probably use something ...
    Fikee Fikee August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... to access the memory while the refresh of the screen happens ... display is drawn and display memory (16384->23295) is ... called 'contended memory' and a detailed description of how the z80 ... * Actually a couple of 16Kx4 DRAM chips paired to make 16Kx8 of memory.
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... want to have enough memory to add extra grapich ... in the future. And memory is cheap.[/quote]
    ... Z80 to run free of wait states. And this ... or smth instructions in video memory area).

    ... considered, then this type of memory is not so cheap.
    secarica secarica August 2004 Sinclair Miscellaneous
  • Latinamerican Speccy Games?Hello all speccy fans! First of all, excuse my english. I'am a spanish native speaker, so I can write (speak) only a little bit of the language. But…

    ... a phone call to one of my friends, and he confirms ... with a few tapes, copies of Psion and Ultimate games (Chequered ... ).

    Excuse my lack of memory.
    Motomono Motomono August 2004 Games
  • This month's Retro Gamer - Cascade 50 honouredWell, after what seems like no end of Cascade Cassette 50 talk this month at WOS ("50 [I]great[/I] games on one [I]great[/I] cassette"), Retro Gamer …

    ... , I think the majority of minigame competition programmers might be ... within 1K or 4K of memory. A lot of time and effort ... heroic efforts given the restrictions of the competition, and the ... general standard of programming is very high. ...
    jonathan jonathan September 2004 Sinclair Miscellaneous
  • This month's Retro Gamer - Cascade 50 honouredWell, after what seems like no end of Cascade Cassette 50 talk this month at WOS ("50 [I]great[/I] games on one [I]great[/I] cassette"), Retro Gamer …

    ... i don think the makers of the games on the cascade ... wrote then in that amount of memory turned out a bit...crap ...
    mel the bell mel the bell September 2004 Sinclair Miscellaneous
  • RGB values for Spectrum colorsDoes anybody know the true rgb color values for the spectrums 15 colors. I'll assume that black is 0,0,0 White is probably 255,255,255 But what are t…

    ... , it's just the 48k of memory, and the registers.

    Quazar Quazar September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... need:

    A region of memory, 65536 bytes in length, to ... 16k of that.

    Maintain a pointer into that memory, ... initialise it to point at memory location 0 (zero).
    ... more bytes sequentially from your memory space for various parameters ...
    Dunny Dunny September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    [quote]A region of memory, 65536 bytes in length, to use as spectrum memory. You need to copy the 48k ROM file into the bottom 16k of that.[/quote]

    How do you copy 48K of information into 16K of space?

    MadDoc,
    MadDoc MadDoc September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... code that declares an array of memory and loads a ROM file ... /> TEmulationState =
    Record Memory: Array[0..65535] of Byte;
    Registers: TZ80Registers ... or fmShareDenyNone);
    F.Read(Memory[0], 16384);
    F.Free ...
    Dunny Dunny September 2004 Development
  • I need ASM for random numberI need to generate a random pair of coardinates in asm so that x=random no between 0 and 31, y=random no between 0 and 23. Any ideas on how to code …

    ... returns with a Integer Out of Range error. :(

    [code]
    of seed to carry
    RL ...
    horace horace September 2004 Development
  • I say, Woo HoooYesterday Amstrad revealed a new Spectrum with Game Controller. [url="http://www.amstrad.com/e3_games.html"]http://www.amstrad.com/e3_games.html[/url…

    ... /> Nice specs as well... loads of memory for such a system... anyoine ...
    CKay CKay September 2004 Games
  • Slightly OT : Xbox emulationI'm interested if anyone here uses a modded Xbox for emulation purposes. I like the idea of using a console rather than a PC for playing games, but I…

    ... 90`s (mainly due lack of memory) and only struggles on complicated ...
    Mort! Mort! September 2004 Emulators
  • 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…

    ... would save a considerable amount of memory. As would storing only positions ... happy to sacrifice the extra memory needed to store the preshifted ... which scrolls the top third of the screen. At the minute ...
    dmsmith dmsmith September 2004 Development
  • Type-Ins Project - appeal #256This is primarily for all those who have just tuned into the Speccy scene (to the veterans- it's just another appeal for type-ins ok? ;) ): As you m…

    ... 've just discovered an error in one of the .tap files I ... with an out of data error when you run out of air. Sorry ...
    darkman darkman September 2004 Sinclair Miscellaneous
  • 8 BIT WARSwhen 8bits ruled the home market Speccys, C64 and Amstrad were the big 3 fighting it out for supremecy.... but they didnt survive which as we know wa…

    ... that poorly executed commodore effort of a 128k?????
    [/quote]
    of memory, which meant that many games ...
    Swainy Swainy September 2004 Games
  • I say, Woo HoooYesterday Amstrad revealed a new Spectrum with Game Controller. [url="http://www.amstrad.com/e3_games.html"]http://www.amstrad.com/e3_games.html[/url…

    ... nice resolution, and the amount of memory... It`s just such a ... just give us a computer, of the old school ilk, with ... basic... possibility of MC etc etc

    CKay CKay September 2004 Games
  • Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…

    ... C64 with a full 64k of memory, a sound chip and an ... extra 16 shades of brown!'
    Im sold ...
    Sharopolis Sharopolis September 2004 Games
  • Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…

    ... C64 with a full 64k of memory, a sound chip and an ... extra 16 shades of brown!'
    Im sold!

    That is exactly one of the reasons i asked you ... i wondered why that choice of going about things and what ...
    HonoredShadow HonoredShadow September 2004 Games
  • Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…

    ... is a combination of all those colours of the Spectrum ( ... see the Spectrum; Representation of the Rainbow. You'll ... anyway hence the lack of this or that capability ... with a full 64k of memory, a sound chip and ... imagine the realistic drawings of turds you can make ...
    Sadako Sadako September 2004 Games
  • Screen$Is there a quick way to get pictures off a PC e.g. from MS Paint, onto the spectrum without having to type in each individual pixel before saving the…

    ... od so.

    Some of the more peculiar custom loaders ... is just in another part of memory there's no reason these ... there's no standard way of doing it - just a lot ... of different methods with their own ...
    cyborg cyborg October 2004 Sinclair Miscellaneous
  • Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…

    That reminds me of an april fool joke one of the magazines played ... to enable an extra 64K of memory hidden in every 48K spectrum ... be done with the extra memory. Typed the Randomize Usr and ... FOOL in flashing letters. Part of me felt it was too ...
    dmsmith dmsmith October 2004 Development
  • Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…

    ... :
    That reminds me of an april fool joke one ... of the magazines played. Can' ... to enable an extra 64K of memory hidden in every 48K ... be done with the extra memory. Typed the Randomize Usr ... in flashing letters. Part of me felt it was too ...
    rich_chandler rich_chandler October 2004 Development
  • Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…

    ... :
    That reminds me of an april fool joke one ... of the magazines played. Can' ... to enable an extra 64K of memory hidden in every 48K ... be done with the extra memory. Typed the Randomize Usr ... in flashing letters. Part of me felt it was too ...
    rich_chandler rich_chandler October 2004 Development
  • Best/worst endingsPity this cheap'n'nasty UBB-clone doesn't have polls, one of the many features it lacks. :roll: :) What does anyone think are the best, and worst, g…

    ... Na Nog amongst my choices of worst endings to Retro Gamer ... didn't have a lot of memory left to play with so ... rather than get any sort of 'Game Over' message confirming all ...
    jil jil October 2004 Games
  • Idea about improving EmulatorHi, I got a bright idea today how to improve such excellent emulators a bit more. Okay, disassemblers are available in nearly every one new released …

    On the subject of new features. What I would ... window which shows an area of memory as graphics, with options for ...
    dmsmith dmsmith October 2004 Emulators
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