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<1…16171819202122…34>
  • Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…

    ... n,(IX+d) instruction, bits 3 and 5 are copied ... of a 16-bit storage register in the Z80, used ... this refers to the WZ register. It has a pair, ... tested and that this register seems to be affected ... .txt[/url] operate on this register ?....

    Question #2: ...
    GOC GOC July 2004 Development
  • 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 …

    ... Alcohol, Dope, Tobbaco and Spectrum AY music, just to keep the ... as it`s expanded some bits of code are maybe a ...
    CKay CKay 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 …

    ... /> .org 0
    .byte ;I register, points to rom spare locations ... sub receives in the hl register the offset from the start ... third and swaps higher 3 bits of l with lower 3 ... bits of h.
    ; It effectively " ...
    Erlstoned Erlstoned 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…

    ... memory modes. Just like ROM select.

    [quote]
    Yes ... Amstrad CPC64+/128+ has the AY emulated that way.
    [/quote ...
    pern pern August 2004 Sinclair Miscellaneous
  • 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…

    ... adding a value to a register, what happens if we ... 20 to a 16 bit register with a value of ... would the value of the register become 15 (i.e. 65530 ...
    The value in the register will be 15. As for ... include the "undocumented" flags (bits 3 and 5) as well ...
    AndyC AndyC 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…

    ... . add the value in register C to register A).

    Starting ... 't be represented in 8 bits - not sure what the value ...
    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…

    ... meaning to the streams of bits it shifts around, the things ... dealing with instructions where the register value would really be more ... a string of bits, or half of a register pair - but you ...
    gasman gasman 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…

    ... (where 'state' consists of the register contents, memory contents and other ... able to follow the corresponding bits of code in Perl / C ...
    gasman gasman October 2004 Development
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... a slice from 34000 bits,saved as RAW and ... through the beeper or the AY chip. Without being fancy ... It plays samples through the AY chip (sounds 4 bit) ... shapes available from the AY. Keeping the noise generator ... sound effects on the AY. Never actually tried it ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... 6.5 (six and ahalf ??) bits sampling and pcm.
    [/quote ... width modulation).

    First select a sample rate -- this has ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... remain when you stop pushing bits.it sound like that. or ... /> The AY chip can do 16 static positions (4 bits) as compared ... levels there are (the more bits, the higher the DAC resolution ... difference between sample rate and bits per sample.

    [quote ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... the upper bits of the address bus and just bank select the ...
    Sparky Sparky October 2004 Sinclair Miscellaneous
  • Announce: EmuZWin 2.5 Release 2.2 Post-FinalEmuZWin Version 2.5 Release 2.2 post-FINAL (16-Oct-2004): [-] A small pause added between TAP blocks while loading tape from .TAP image (otherwise s…

    ... thing when I select an area of 8x8 bits and try to ...
    Arm73 Arm73 November 2004 Emulators
  • Vanished without a trace.Hi everyone, I've just noticed that ENERGY4UK's posts have been deleted in their entirety. That's great. Hopefully our beloved administrator will co…

    ... to something more sensible. Re-register, log on and start exchanging ... />
    EDIT: Dropped some trite bits and added others. Really. :)
    Arjun Arjun November 2004 Sinclair Miscellaneous
  • OT: XP Service Pack 2 slightly annoying thingIs anybody else bugged by a little yellow shield with ! on it in the notification area of the task bar? Its to do with automatic updates and it alwa…

    ... />
    In the general tab, select "Off (Not recommended)". Then click ...
    Starglider Radio - Appreciating the AY and the BEEPer since 1982 ...
    The Starglider The Starglider November 2004 Sinclair Miscellaneous
  • Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…

    ... lower three bits are used to determine which register will hold the ... be prepended unless the lower bits are 110.
    vreddy vreddy December 2004 Development
  • About z88dk and autoexecsThis weekend I was playing a little with z88dk C cross Compiler. Amazing tool! I have three questions: 1- Does anybody know how to change the initia…

    ... 'load binary' option. Pick, that, select your bin file and choose ... arranging to change the border bits only so as not to ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • 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…

    ... with the I register (I in top 8 bits, identifier in bottom ... 8 bits) to form a ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • Samples on ZXWhat is the easiest way to make a sound sample (e.g. sampled speech)on Spectrum using pc samples? Suppose a have a PC .wav file and I want to transf…

    ... would allow for 6.5 bits (42 levels) on a Spectrum ... bit - the ear and mic bits drive at different voltages. 4 ... most conveniently done on an AY. In both cases the most ... outputted by a Spectrum - the AY has an exponential curve output ...
    cyborg cyborg April 2005 Development
  • Lots of Speccy games / hardware for saleGot a lot of tapes/unboxed tapes, hardware for sale (not sure what all the hardware is !) Any ideas on a rough price for it all ? Also any help iden…

    ... games, got a few hardware bits still to list...

    Select 1 - 12 great games on ...
    psj3809 psj3809 June 2005 Sales
  • THE best arcade conversion??After thinking about the ZX Club Hypersports and other games such as Flying Shark what do you think is the best arcade conversion. What makes the gra…

    ... big
    Guns, 3D perspective bits and control rooms to attack ... musci keeps playing and playing. AY driven gameplay.
    Spectea_um Spectea_um June 2005 Games
  • Spectrum IDE port addressesWith eight standard IDE ports to address and with the common access to information via the internet I would have thought that Spectrum IDE add-on har…

    ... />
    - Only A0..A7 address bits are used so we can ... OUTs and preserve BC register.

    - Bits 5 and 7 block ...
    baze baze July 2005 Development
  • Best method for sprite collision detectionHi, I have been trying to incorporate collision detection into a sprite routine I writing. The following is what I have come up with so far: POP D…

    ... B is still a free register.

    But does this ... .
    AND E ; exact other bits
    JR NZ,NC0 ; jump ...
    Dr BEEP Dr BEEP August 2005 Development
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... memory. Something like having your AY music compressed and calling these ... set, print with it, and select another (like when switching codepages ...
    Alcoholics Anonymous Alcoholics Anonymous October 2005 Development
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... de ; destination pointer to 2nd register
    exx ; set
    pop ... a, (hl) ; number of escape bits
    inc hl
    ld ... /> ld b, a ; 8 - escape bits
    ld a, 8
    na_th_an na_th_an October 2005 Development
  • Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.

    ... that I would have to select the +3 if I wanted ... the 48K machine and an AY chip that works using either ...
    lordcoxis lordcoxis October 2005 Emulators
  • Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?

    ... off the low 3 bits of each register (H and L) to ...
    icabod icabod December 2005 Development
  • "Unknown disk format"-error on Spectrum +3Hi, I have just gotten around to changing the drivebelt in my newly acquired +3. I tried to format one of the 3" disks I bought on eBay the other we…

    ... need a small switch, three bits of wire (150mm long) and ... goes to internal drive A: Select, wiring this point BEFORE the ... switch then goes to drive select on internal drive A: and ... connecter which connects to drive select A on the external drive ...
    DEATH DEATH December 2005 Hardware
<1…16171819202122…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

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ay 7.7K 12K
register 4.2K 6.1K
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