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<1…12131415161718…34>
  • SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …

    ... must place 7ffd on the data bus to access the I/O ... T1 (although the 'address on data bus' effect mentioned above complicates things ...
    Philip Kendall Philip Kendall May 2004 Emulators
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... ula and z80 data bus -- there's a '245 bus trasceiver in there ... tc2048 has a resistor decoupled data bus to make it more compatible ... on all the Spectrum's data lines. The ts2068 only has ... pullups on a few data lines so some bits may ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... ula and z80 data bus -- there's a '245 bus trasceiver in there ... tc2048 has a resistor decoupled data bus to make it more compatible ...
    Fred Fred May 2004 Emulators
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... ula and z80 data bus -- there's a '245 bus trasceiver in there ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... . The PIO by scanning the data bus can tell that the interrupt ...
    Mikie Mikie July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... . The PIO by scanning the data bus can tell that the interrupt ...
    Alcoholics Anonymous Alcoholics Anonymous July 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…

    ... use. This carry from bit 6 to bit 7 is an overflow and ...
    AndyC AndyC September 2004 Development
  • Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…

    ... PC+3 is on the data bus and is contended in a ...
    Philip Kendall Philip Kendall September 2004 Development
  • ZX80 - it wont die.The Mighty Dope Throne's ZX80 cgc entry has got me thinking. Does anyone know anything about how the zx80 works internally? is it very close to the z…

    ... modes - instead of the data describing the bit patterns that make up ...
    cyborg cyborg September 2004 Development
  • Need help with my P flag!Not sure if I've emulated the P flag correctly when its comes to overflows. Here's what I've done: LD A,123 LD B,16 ADD A,B Twos Complement of 123 …

    ... easy - it just picks up bit 7 of A. I think ... doesn't fit in 8-bit 2's complement, it's ... the carry out (borrow?) from bit 6 as the addition (subtraction?) is ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • ADCI'm a little confused about how the Z80 manages the ADC instruction. I'm assuming two ADD instructions are performed (am I wrong?!) I can think of 3 …

    ... with the least significant bit on the right and ... Cin of the least significant bit (A0/B0) are left ... Cout of the most significant bit (the full adder for ... Cin for the least significant bit (the full adder for ... carry out of bit 7 XOR carry out of bit 6).

    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…

    ... that should be copied to bit 6 of all ULA port reads ... . I'm understanding it a bit more clearly now.)
    Unique Unique March 2005 Emulators
  • IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…

    ... that should be copied to bit 6 of all ULA port reads ...
    Luca Luca March 2005 Emulators
  • Polyphonics and Ringtones...Im bored, so Im just askin, so if youre bored you could reply... ...you dont have to if you dont wanna ;) so... What ringtones do you have on yo…

    ... we've grown up a bit
    6) Because other people think ... have about 50 is a bit odd
    9) Because of ...
    psj3809 psj3809 July 2005 Chit chat
  • 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 test bit 5 or bit 7 for zero). Bit 7 also ... Gama clone.

    - Bit 0 blocks activation of 48k ... IORQ)

    - Bit 1 blocks activation of 128k ... infamous IN A,(#FF). Bit 6 was chosen for this.
    bit port access which other ...
    baze baze July 2005 Development
  • Quicker Computing:WOS-'documentation' CSS FAQ link did not help.

    [quote]
    Are you referring to the 'SLOW' and 'FAST' commands?[/quote]
    yes, the SET-FAST routine is called to reset bit 7 of CDFLAG, and then bit 6 is reset.
    dalmudlee dalmudlee August 2005 Sinclair Miscellaneous
  • 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 …

    ... block and a variable length data block.

    ... * Leader: 8063 (header) or 3223 (data) pulses of 2168 tstates each ... 735 tstates.
    * Data: a reset bit is encoded as two ... header blocks, 0xff for data blocks.
    * Data.
    * A checkbittoggle ...
    Philip Kendall Philip Kendall September 2005 Development
  • Mnemonic HELPREFERENCE: [url="http://www.geocities.com/SiliconValley/Peaks/3938/z80_home.htm"]http://www.geocities.com/SiliconValley/Peaks/3938/z80_home.htm[/url…

    BIT 6,A - Z/NZ test
    AND 64 - Z/NZ test
    Woody Woody October 2005 Development
  • Mnemonic HELPREFERENCE: [url="http://www.geocities.com/SiliconValley/Peaks/3938/z80_home.htm"]http://www.geocities.com/SiliconValley/Peaks/3938/z80_home.htm[/url…

    [quote]
    On 2005-10-04 19:43, Woody wrote:
    BIT 6,A - Z/NZ test
    AND 64 - Z/NZ test
    dalmudlee dalmudlee October 2005 Development
  • Emulation Feedback** Extended RTM sessions could over-tax the CPU.

    ... is used to build the EAR bit.

    The Real Tape ... signal coming in to the EAR bit of port $FE.

    Dunny Dunny October 2005 Emulators
  • Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…

    ... /loading is done on bit 6 instead of bit 7? I'd say ...
    MikeW MikeW November 2005 Emulators
  • Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…

    ... /> ..,,.. 23658 FLAGS2 BIT 5,6,7
    ..,,.. 23665 FLAGX BIT 2,3,4 ...
    ..,,.. 23612 TVFLAG BIT 6,7

    in my ...
    Dunny Dunny March 2006 Sinclair Basic
  • Shoot-em-up Development UpdateHi Folks, I am still working away at my horizontal scroller. Here is a link to let you see progress. I have re-written the scrolling routine to make…

    ... ]OFFSETB LD L,0
    BIT 6,A: JR NZ,FIVECOLS
    [FONT=Courier New] BIT 6,H: JR NZ,DRAW_LAST_TILE[/FONT ... [/FONT][FONT=Courier New]RES 6,H
    LD SP,HL ...
    dmsmith dmsmith April 2006 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... bit 7 = 1 occluding, bit 6 = 1 last column, bit 5 = 1 last row, bit ...
    uchar attr_mask; // +6 attribute mask logically ANDed with ... with other sprites; a bit esoteric for sure. A ... only the SP1_RFLAG_COLOUR flag bit is set, only the ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…

    ... . When the status of the EAR bit changes, the size of B ...
    Woody Woody May 2006 Emulators
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... /> uchar nload; // +0 bit 7 = 1 for invalidated, bit 6 = 1 for removed ... /> {17,0,10,7}, // square 6
    {17,11,10,7 ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... from shipy value i.
    bit 6,a ;test if >63 ... from shipy value ii.
    bit 7,a ;test if > ...
    48K 48K May 2006 Development
  • Trying to experience nostalgia!! Mp3s needed!!!I've been trying to get audio files (mp3 or wav) to work on my real old sinclair 48k. I've tried making them from my old tapes of which I have many, …

    ... program will read the data from EAR and simultaneously write it to ...
    Alcoholics Anonymous Alcoholics Anonymous July 2006 Games
  • Spectrum audio signallingI've had a poke around in some of the docs (and my Z80 assembler-fu is so rusty it'll be a while before I grok the Complete Spectrum ROM disassembly)…

    The EAR bit does see absolute low/high ...
    obo obo July 2006 Hardware
<1…12131415161718…34>

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