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<1…16171819202122…34>
  • Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…

    ... AND, OR and so in Z80 assembly?
    [/QUOTE]

    reset. A beginner looking at the ... convey groups of set or reset bits at a glance as ...
    Alcoholics Anonymous Alcoholics Anonymous November 2007 Development
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... . The CPLD will trap the Z80 executing (i.e. MREQ active ... is being run.

    RESET entry point that gets latched ... or push of the RESET button (i.e. /RESET goes low) and ... port's A15 high on reset to prevent downstream peripherals paging ...
    Winston Winston November 2007 Hardware
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ... on the data bus gets reset). Then this repeats for the ... .5 MHz system clock (the Z80 deasserts RD+MREQ a short ... the data bus when the Z80 was also reading the bus ...
    Winston Winston December 2007 Hardware
  • DivIDE HelpHi all, After a rather long wait my DivIDE from Papaya labs arrived. I connected it to my spectrum, turned it on and...nothing. The green power LED…

    ... (such as the Z80). The power-on reset SHOULD clear the indeterminate ... + R on the DivIDE to reset and hold down SPACE to ...
    Winston Winston February 2008 Hardware
  • The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…

    ... contribution (Metalbrain):[/i]
    - Added reset for +2A mode.
    - Fixed ... a bug when loading .z80 files saved in +2A/+3 ...
    Metalbrain Metalbrain February 2008 Emulators
  • DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…

    ... . You can then press the reset button on the Spectrum 128K ... i load 128k games from .z80 files without problems....

    gtsamour gtsamour February 2008 Hardware
  • Why are we here? (At WoS)No, not a deep philosophical question about the nature of life, the universe and human existence. The thread &#8220;what does your partner think of …

    ... with the shareware version of Z80, but it didn't feel ... still felt much better than Z80 (play Jetset Willy on both ... Z80 and X128 from that time ... Speccy should have had a reset switch and a power switch ...
    ewgf ewgf March 2008 Sinclair Miscellaneous
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... DMA sequence - work with all Z80 DMA clones (UA858D,MOSTEK,ZILOG ... + 3T write

    ;REG6-reset
    COM defb #C3,#C3 ...
    velesoft velesoft April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... ;write complette DMA sequence to Z80 DMA(after last OUT is ... ,$C3,$C3,$C3,$C3,$C3 ; - reset DMA, set default 3T transfer ...
    velesoft velesoft April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... DMA sequence - work with all Z80 DMA clones (UA858D,MOSTEK,ZILOG ... understand why there are 6 reset commands:

    [QUOTE]
    ;REG6-reset
    COM defb #C3,#C3 ...
    glancaster glancaster April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... understand why there are 6 reset commands:

    2) ... this 4bytes and reset is ignored. In original Z80 DMA manual (book ... ) is writen 6x reset = 100% DMA reset. You ... DMA routines, but after start/reset RESIDOS is need use 6x ...
    velesoft velesoft April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... (use OUTIR) and ZX will reset then after new DMA seqence ... the ResiDOS reset code.

    [QUOTE]In original Z80 DMA manual ... the manual (part of the Z80 CPU Peripherals User Manual), and ...
    glancaster glancaster April 2008 Development
  • Start Tape, Press any key...Hi, I'd like be able to save (program or data or code) using the save "whatever" command, but I want it to start recording immediately, rather than …

    ... BASIC line as direct commands reset the input routine as does ... . This text is interpreted as Z80 code. It eventually finds a ...
    Geoff Geoff May 2008 Sinclair Basic
  • Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…

    ... the reset button (or short C27). The Z80 will enter the reset state ... M1 pin.

    Release reset and let the Spectrum to ... halts the CPU. While the Z80 is halted, it perform NOP ...
    mcleod_ideafix mcleod_ideafix June 2008 Hardware
  • NEG Carry ProblemJust when I thought I had the carry flag figured... I'm implementing the NEG instruction but I keep getting the incorrect value for the carry flag. …

    ... other hand, the [url=http://z80.info/zip/z80cpu_um.pdf]Zilog ... ]not[/b] 00H before operation; reset otherwise.[/QUOTE]

    (my ...
    Philip Kendall Philip Kendall July 2008 Emulators
  • Nmi menu for MB02+ enters 21st century:)Dear speccy users and especially MB02+ ones, I am proud to anounce that after 5 months of ceaseless and intensive work I am releasing new version of…

    ...

    ALso loading of Z80 snaps is very usefull I ... Residos+JP 0 (resulting in reset, of course) and second is ...
    Hood Hood August 2008 Development
  • I blew up my +3I'm still not sure of what happened (most probably a wrongly inserted interface) but I blew up my +3. What happens when I turn on the power or press …

    ... the power or press the RESET button varies. Sometimes I get ... /> 1: the z80. (As things happen when you reset, it sounds unlikely ... , however, as the z80 is usually ...
    spodula spodula November 2008 Hardware
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... bit is being set and reset, it's just that it ... adjacent bits get set or reset, or bit fade.

    Z80 writes to all 8 chips ...
    Winston Winston January 2009 Games
  • Questions about registers, stack, etc.I was told that if I wanted to export code and create unprotected versions of games I should do the following: 1-Find the starting address by using …

    ... work, otherwise the code might reset.[/QUOTE]

    It was ... than instant snapshot. Also restoring Z80/SNA or Multiface snaphots to ...
    LCD LCD January 2009 Sinclair Miscellaneous
  • Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…

    ... comfortable emulator files (TAP,SNA,Z80) loading. Residos can select/change ... .gif[/img]
    This is .Z80 snapshot for original DIVIDE - erase ... with absolutly different rom, after reset/power on can system in ...
    velesoft velesoft January 2009 Hardware
  • Thinking in Assembly (first efforts)The following is one small routine to educate myself on a few concepts (jumps, flow control, routines, CPI): [code]searchmem xor a …

    ... the tables from [url]http://z80.info[/url]. But I'll ... : xor a ; search for 0. reset flags
    cpi ; a-(HL ... everything and the table from z80.de I've been using ...
    rahtgaz rahtgaz January 2009 Development
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... to externally trigger the Z80 reset line because the reset circuity does not ...
    bladerunner bladerunner February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... knowledge (about externally triggering the Z80 reset line...) I've become pretty ... have some extra memory ICs, Z80, ROM, and a spare ULA ... few minutes running it would reset, lock up. It ended up ...
    thomas3120 thomas3120 February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... br />
    BTW. Triggering the Z80 Reset line is simple. There is ... a reset "pin" on the edge ... then the Z80 will be held in reset. Releasing the reset line takes ... the Z80 out of reset. You ...
    bladerunner bladerunner February 2009 Hardware
  • plus3e simple ide interface problemhi, I prepared a 8bit simple ide interface 3 days ago, but I got problems (with or without ide cable connected). 1.First of all, I have to press re…

    ... I have to press reset switch 4-5 times to ... difference at the speeds the z80 runs at. You would ... Z80's a bit, and sometimes means it doesnt reset ... a 74LS14 to buffer the reset line.
    To be ...
    >reset itself randomly. it can reset itself while idling ...
    spodula spodula February 2009 Hardware
  • Tech question about microdriveshi ! I dont know if someone out there can help me I recently got my paws into an interface 1 and 2 microdrive units form an ebay auction they wore …

    ... you've discovered doing a Z80 Reset (pressing Reset button) does nothing!
    Jimmy Jimmy February 2009 Hardware
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... ] is a label. When writing Z80 assembly, you typically indent it ... time to reach for the reset switch.

    Now for ...
    joefish joefish April 2009 Development
  • ZX81 expander - Is there one for the Speccy?Saw this on ebay today: [url]http://cgi.ebay.com/ZX81-Timex-Sinclair-1000-Expander-board_W0QQcmdZViewItemQQcategoryZ4193QQihZ010QQitemZ200338572087Q…

    ... to the bus, the Z80 won't be able to ... won't run. The Z80 only has so much fanout ... -CF simultaneously. However the RESET line on the Spectrum is ... Speccy from functioning because the RESET line will never get to ... that's why the Spectranet RESET line is buffered).
    Winston Winston May 2009 Hardware
  • Program Counter question - please readSorry if this is in the wrong forum, but please read it through anyway - see on the FUSE PSP emulator I asked the author if he'd add an option to pri…

    ... view of the Z80, it *never* crashes. The Z80 just continues and ... program. The only time the Z80 halts is when it hits ... faulty code except by pressing reset or removing the power. But ...
    Winston Winston May 2009 Emulators
  • DivIDE and Spectrum +2 (gray)DivIDE connected to my +2 always resets it in 48k mode. Some of the 128k games work but some don't. Is there a solution for it? My DivIDE has a Fatwa…

    ... patch (in Z80/TAP file) for enable 128 menu after RESET.
    - after reset will always 128 menu
    velesoft velesoft May 2009 Hardware
<1…16171819202122…34>

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