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<1…25262728293031…34>
  • Why, Speccy?OK, wanna see something strange? Go to your Spectrum (or Spectrum emulator), and type PRINT 10-100*0.1 :-o:-o:-o Why???

    ... & #3) eliminates the error.

    Instead of [b]a - b ... .1)[/b] .

    Instead of [b]0.n n/10 ... in the last mantissa byte. The alternative versions wangle it so that the last byte works out the ...
    Battle Bunny Battle Bunny January 2013 Sinclair Miscellaneous
  • Quest for Witchcraft undeniencedI notice on the latest [url]http://www.worldofspectrum.org/whatsnew.html[/url] (02 Jan 2013) that LCD undenienced [url=http://www.worldofspectrum.org…

    ... myself at some point as the joy/key-testing code in ... of the last few versions of Beepola. I guess an old version of Beepola was used ... back in October 2010, predating the (c)2011 message in Quest ... . I'm guessing Mr.Beep used summat else to do that ...
    ccowley ccowley February 2013 Games
  • Keyboard TrickI know how to use the multi key in BASIC with IN you can get the keys [QUOTE]IN 254+256*(255-2^K)[/QUOTE] K is the keyboard's half row, comes from …

    ... : LD E, 5 ; Loop 5 bits per half-row
    IN ... and 3rd byte (31,192) is the start address of the 40-byte buffer)
    [/code]

    An example of using the 30 byte ...
    BloodBaz BloodBaz February 2013 Sinclair Basic
  • Quest for Witchcraft undeniencedI notice on the latest [url]http://www.worldofspectrum.org/whatsnew.html[/url] (02 Jan 2013) that LCD undenienced [url=http://www.worldofspectrum.org…

    ... of the last few versions of Beepola. I guess an old version of Beepola was used ... back in October 2010, predating the (c)2011 message in Quest ... . I'm guessing Mr.Beep used summat else to do that ... Soundtrack, recieved it and linked the code. Maybe you are right ...
    LCD LCD February 2013 Games
  • Compiling Lisp to Z80.I am doing some thought experiments on this. Here is an example of a Lisp program. It adds two numbers together. [code] (define (add x y) (if (= …

    ... to be thinking of supporting the wide variety of built-in ... variable would typically comprise of a byte which defines it' ... actually holds the data type in bits 5-7 of the first byte) and ... ZXBasicManual/zxmanchap24.html]chapter 24 of the Spectrum manual[/url] ( ...
    BloodBaz BloodBaz February 2013 Chit chat
  • Unravelling the Spectrum Floating Point Number formatHi Guys, In my head I pretty much understand how the Spectrum's 5 byte FP number format works. The first byte is the signed exponent and the follow…

    ... else
    // it's the 5 byte float.

    ... note that we ignore the high bit of the first byte.
    Result := ... Result + AnsiChar(Byte(((Mantissa Shr ... a long time since I last did this though.
    ...
    Dunny Dunny March 2013 Sinclair Miscellaneous
  • Oldest thing of yours you ownthe oldest game thread gave me the idea for a thread about things you own which are the oldest, the thing youve owned the longest. my dad died recen…

    ... from about the 1860s. The houses on our row of terraced houses ... extended about 1900, and the rest of the terrace wasn't built ... window-shaped alcove. That bits of the house were added later means ... since it used to be the exterior one.

    The other ...
    Winston Winston March 2013 Chit chat
  • Does anyone still have the same speccie?The survey into the Games of the Year - and the question about what system you were playing 20 years ago - got me thinking. Has anyone on the forum …

    ... 48K Spectrums since the launch of the Amstrad models so ... ever ZX Spectrum, one of the last sold 48K rubber key ... FI (1985/1986) I used it to load and ... I still have some of the records and tapes from ... currently being used to listen to the output of my Pioneer ...
    ASM ASM March 2013 Games
  • Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …

    ... if you leave the last byte off, depending on what the next instruction is ... />
    Anyway, the assembler I'd recommend is Pasmo, of which there ...
    Matt_B Matt_B March 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... ; prev+1==pos) { // Its high byte of word
    } else {

    the last byte!
    // Make sure you write ...
    tstih tstih April 2013 Development
  • BetterBytes Disc-Mate MGT Protectionmornin all while lookin at a few programs last nite i noticed disc-mate has some form of protection on it it will load fine in zxspin but try and loa…

    ... were differences in the multiple copies of sectors added to the EDSK by ... with and without multiple copies of the Speedlock weak sector: [url]http ... . I know some emulators fiddle the last byte in error sectors in order ...
    obo obo April 2013 Sinclair Miscellaneous
  • BetterBytes Disc-Mate MGT Protectionmornin all while lookin at a few programs last nite i noticed disc-mate has some form of protection on it it will load fine in zxspin but try and loa…

    ... and without multiple copies of the Speedlock weak sector: [ ... Only the 'multi' image should pass the protection check, since the other ... know some emulators fiddle the last byte in error sectors in ... work as intended with the Speedlock detection disabled. This ...
    Fred Fred April 2013 Sinclair Miscellaneous
  • Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…

    ... that fully decodes the port instead of just 0x1F. Then ... to use each bit of the high byte for a joystick 1 ... interface and change one of the address lines. So if ...
    But using the high bits on a Kempston port read ... to pick 1 of ...
    joefish joefish April 2013 Hardware
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... addresses of high/low pairs or just the high order bytes. The ... For example, if we always used 16-bit addition, we'd ... only need to store the address of the first byte which needs fixing up ... then we need double the amount of tablespace to store these offsets ...
    u6c87 u6c87 April 2013 Development
  • How do I detect if key 'H' is pressed in machine code?How do I detect that the key has been pressed? I have been using the IN 239 command for keys 6-0, but dont know how to detech 'H'...

    ... for want of something to put on the other 8 bits of the address bus ... , either the A or the B ... the full 16-bit i.o space meant to be used for? The ... bottom 8 bits are meant to ...
    Alcoholics Anonymous Alcoholics Anonymous April 2013 Development
  • New SNES cartridge project in KickstarterI dont know if someone has already posted this, but there is a project, a 4-in-1 cartridge for the Super Nintendo on its way, people are very support…

    ... flaw with SNES Everdrive.. If the game used a custom chip such ... the Special FX ( Starfox, Yoshi's ... SNES at all, since the editor used to make them wasn't ... or DSP). A lot of the last wave of MD titles did this, as ...
    ewgf ewgf May 2013 Chit chat
  • "Chronos": how fast should it really be?I was reading [URL="http://timfollin.pwp.blueyonder.co.uk/Archive.htm"]Tim Follin's webpage[/URL] the other day and came across a curious remark abou…

    ... 20 seconds, indeed, the face of the Chronos develops a mouth ... completely independent of the way in which the user does ... read up the first four bits of the current value of the system timer ... used to select a version of the high scores table to be used during the ...
    introspec introspec May 2013 Development
  • The Official Crap Games Competition 2013 Thread!Just to announce that the 2013 CGC is OPEN! [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/cgctitle2_zps77591934.jpg[/IMG] And for th…

    ... after the last byte is loaded, hence a short burst of white noise (the BASIC ... ) and 3 minutes of the same whiney ... noise as it emulates the loading of - well, nothing. Hence the ...
    leespoons leespoons May 2013 Games
  • The new xbox...I hope the launch of the new xbox (6pm BST today!!) blows the dismal PS4 launch into orbit!! I'm not sure if I'm getting excited or not. I still rem…

    ... games, as they have the luxury of DVD capacity to fill. If ... game developers have bemoaned the size of DVDs for the 360 and several ... textures/samples or even dropping bits of the game to fit them on ... the space available as "a luxury", nor any who hadn't used ...
    AndyC AndyC May 2013 Chit chat
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... the Microdriver uses RET rather than RETN because it's previously used ... emulators handle bit 0 of the interrupt flags byte. It can be ... off (the attributes in the bottom right-hand corner of the screen will ... that treats bit 0 of the flag byte as IFF1, I suspect ...
    John Elliott John Elliott July 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... the Microdriver uses RET rather than RETN because it's previously used ... emulators handle bit 0 of the interrupt flags byte. It can be ... off (the attributes in the bottom right-hand corner of the screen will ... that treats bit 0 of the flag byte as IFF1, I suspect ...
    ZXMAK ZXMAK July 2013 Emulators
  • Lame claims to fameWhat's your most tenuous brush with the glittering world of celebrity? Here's a few of mine (all 100% genuine): - I was coming out of an Ed's Easy …

    ... Hurt.
    My Dad Used to catch the last bus home with Bobby ... went to a barbeque at the bass player [or may be ... /> I used to work with the cousin of Joanne Harris author of C[URL ...
    murtceps murtceps July 2013 Chit chat
  • Elite's iPhone/iPad Spectrum Emulator updated... with Manic Miner, Monty and more!This was updated earlier today: [URL="http://itunes.apple.com/gb/app/zx-spectrum-elite-collection/id391336343?mt=8"]link[/URL]. Now includes Manic M…

    ... highly unlikely as RARE has used parts of the Atic Atac IP in ... that I can think of from the top of my head. This is ... a regular basis, including bits of Ultimate Play the Game IP, as if ... . The most obvious example of reuse would be the re-issue of Jetpac on the ...
    ADJB ADJB July 2013 Announcements
  • FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…

    [QUOTE=Einar Saukas;713440]Because the last byte in [B]AT 100,0[/ ... you shouldn't be storing the co-ords as part of the string.
    chev chev July 2013 Brand new software
  • Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…

    ... or output port operation, the full 16 bits of the address bus is valid ... only address bits A0 to A7 can be used. And indeed the instruction ... give the impression that only the lower half of the address bus is used. [URL ...
    1024MAK 1024MAK August 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... ;; 1, thus the lowest three bits of the accumulator are
    ... ;; 1, thus the lowest three bits of the accumulator are
    ... byte instruction
    nop
    and 7 ; keep only the lowest three bits of ...
    stephenw32768 stephenw32768 August 2013 Development
  • Mirroring UDG'sJust wondered is there a quick an easy way of mirroring UDGs (byte values)? i.e. BIN 11110000 becoming 00001111 etc.

    ... all the bits from the first byte, then the AND cuts out only the (corrupted) bits you ... the bits along two places, then interleaves them with the original byte, meaning pairs of bits ... to wrap the groups of four bits round from one end of the byte to the other ...
    joefish joefish August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... br /> ;; 1, thus the lowest three bits of the accumulator are
    ;; ... br /> ;; 1, thus the lowest three bits of the accumulator are
    ;; ... nop ; room for a one-byte instruction (4T)
    .border_mask ...
    stephenw32768 stephenw32768 August 2013 Development
  • I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…

    ... max everything out before finishing the last few bits of the [I]Dragonborn[/I] DLC ... ]In the game I played, I started learning a combination of conjuration ... and destruction, but gave up on conjuration in the ...
    GreenCard GreenCard August 2013 Chit chat
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... /> This is probably one of the stupid questions, but what is ... can only operate on the 8 of the 16 bits whats up with that ... a memory address and changes the bits of the byte at that address.
    < ... (HL) will operate on the first byte of the screen display.
    Pobbit Pobbit August 2013 Development
<1…25262728293031…34>

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