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<1…17181920212223…34>
  • UncontendedThis may be a real daft question as I consider myself to be a bit of a programmer, but &lt;deep intake of breath> here goes... When refering to memo…

    It means the Z80 isn't fighting with the ULA for access to the memory.
    cyborg cyborg February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... up from the Z80 to the RAM. Since the ULA doesn't ... need the Z80 to fetch memory ...
    cyborg cyborg February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... 'm confusing a ULA memory read with a Z80 memory read.
    The Z80 reads the first ... it via Memory[16384]. The ULA does the same thing but ... least 7 tstates but the ULA can load a screen attribute ...
    Unique Unique February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... m confusing a ULA memory read with a Z80 memory read.< ... br /> The Z80 reads the ... via Memory[16384]. The ULA does the same thing but ... each other for the ULA and Z80. Connect the buses differently ... 7 tstates but the ULA can load a screen ...
    cyborg cyborg 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…

    ... read and CALLed by the Z80.

    Effectively, ... br /> On the Spectrum, the ULA is not an im2 aware ... In that case, the z80 reads whatever is floating on ... fe. This means that the z80 will *always* call address ... and this fools the ula into thinking there is ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • Hypersports problem - freezes before 1st event?I am using Fuse on Mac OSX, have tried a few of the available Hypersports in the archive now, but each one appears fine until I start the first event…

    ... "tstates < 48" test in z80/z80.c:z80_interrupt() to (say) "tstates ... value for how long the ULA holds /INT low for on ...
    Philip Kendall Philip Kendall February 2005 Games
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... likely to be a dead ULA, dead Z80 or dead lower 16K ...
    Spirantho Spirantho June 2005 Sinclair Miscellaneous
  • Investronica Inves Spectrum +Hi, Has anyone here ever heard of the Investronica Inves Spectrum +? This site [url="http://www.silicium.org/uk/sinclair/inves.htm"]http://www.sili…

    ... in Sinclair Spectrum + computers. The Z80 CPU was made by Zilog ... be easily modified. Also, the ULA was vastly enhaced, and developed ... which is divided for the ULA and the CPU.

    na_th_an na_th_an June 2005 Sinclair Miscellaneous
  • "Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]

    ... together a Z80, a bit of RAM and the ULA. You may ...
    Fr?hn Fr?hn July 2005 Games
  • "Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]

    ... together a Z80, a bit of RAM and the ULA. You may ...
    rich_chandler rich_chandler July 2005 Games
  • Help! +3 won't work anymore!I've just set up my old +3 and it just won't work - it used to a few months ago but now it won't :( I'm in need of some expert help so here's the pr…

    ... /> - rom chips were okay
    - z80 cpu was okay
    - keyboard ... myself think it is either ULA (you cannot replace easily) or ...
    Timppa Timppa August 2005 Sinclair Miscellaneous
  • Help with +3 in comaHi everyone Had a spectrum +3 under the bed for some time and when replacing its drive i accidentally connected the 5v and the gnd of the led. Now…

    ... ] more likely to be the ULA, in which case it's ... motherboard time, or hopefully the Z80, in which case it's ... former more likely to be ULA, yes.

    Here's ...
    Spirantho Spirantho August 2005 Sinclair Miscellaneous
  • Help with +3 in comaHi everyone Had a spectrum +3 under the bed for some time and when replacing its drive i accidentally connected the 5v and the gnd of the led. Now…

    ... />
    Well, already replaced the z80 and the roms for eproms ... hope that its not the ULA that is behind all this ... post about soldering a new ula and i could give it ... my hands on a +3 ula somehow or is there a ...
    odious odious August 2005 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... , have you tried changing your Z80 or ULA or anything? Either of ... fault (unlikely to be the Z80 but you never know).
    ULA...? How long did Amstrad make ...
    Spirantho Spirantho September 2005 Sinclair Miscellaneous
  • New GP32 coming out....The spec looks excellent and should run MAME, SNES and hopefully GBA full speed. Whats also exciting is the TV out connection !.... The ultimate ho…

    ... tied by the ULA emulation to the main z80 emulation - if you ...
    Dunny Dunny September 2005 Sinclair Miscellaneous
  • Fairlight 48k - version 1 missing from archive.I have an original version of Fairlight WITHOUT the copyright message 'Copying this tape is against the law under the Copyright Act, amended 1985. C…

    ... speccy showing and everything labelled (z80, ula memory etc), and descriptions.
    FrankT FrankT September 2005 MIA/STP/SDP
  • New CEZ GS game: COLUMNSFinally we've finished it!! After a long time coding, making graphics, musics and testing (as you could view in the forum if you know spanish -sorry-…

    ... ) and then loaded the resulting .Z80 file. Works 100% (and the ... - so it is a perfect .Z80 snapshot).

    If you ... are experiencing are probably the "ula snow" effect of the grey ...
    Tom-Cat Tom-Cat October 2005 Games
  • AdviceIf I connect a personal CD Player to my +2A to load Speccy games from the CD-R/CD-RW to the SOUND socket of the +2A, will anything happen to the comp…

    ... easier to replace than a Z80 or ULA or any other critical ...
    cyborg cyborg November 2005 Sinclair Miscellaneous
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ...
    Think of the Z80 and the ULA as two devices running ... at a time. The ULA obviously takes priority, so ... z80. You have no control over the ULA. As the ULA ... change the attributes as the ULA passes over them, and ... the same location - the ULA will pick up the ...
    Dunny Dunny November 2005 Hardware
  • Faulty 128Need some help here. I've got a 128+ that won't boot to the menu. It just displays a load of rubbish on the screen. Here's an example of what it does…

    Probably bad RAM/Z80 but maybe a fried ULA, possibly a whole jost of other possibilities.

    You need the help of: (que superhero music) Spirantho. He's about the best guy to ask on here.
    DEATH DEATH November 2005 Hardware
  • 128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…

    ... speccy's ingenious resistor-decoupled z80 and ULA buses, luckily only very ...
    Digital Prawn Digital Prawn December 2005 Hardware
  • broken ZX SpectrumHi there I was given a dead ZX Spectrum years ago, and being bored today thought I'd try it again. Its a Sinclair ZX Spectrum with lovely rubbery key…

    ... as likely to be the Z80, the lower RAM block, the ... the lower memory block, the ULA - in fact, it could be ...
    DEATH DEATH January 2006 Hardware
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... 8 bit identifier. The z80 forms a 16 bit address ... is left floating when the z80 wants to read the ... when the ULA's vbi interrupt occurs, the z80 reads a ... the data bus when the z80 is looking for a ... identifier will be when the ULA interrupts. So, to deal ...
    Alcoholics Anonymous Alcoholics Anonymous February 2006 Development
  • 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…

    ... to 65535

    The Z80 microprocessor inside the Spectrum can ... /O map.

    The Z80 microprocessor inside the Spectrum can ... screen. It writes to the ULA?s (uncommitted logic array) register ... the byte sent to the ULA control the border colour of ...
    Blondin235 Blondin235 March 2006 Sinclair Basic
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... 256 banks of 16k. The Z80 address space
    is split ... b2 b1 xx - Page where ULA fetches
    video data from ...
    MikeW MikeW April 2006 Hardware
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... 256 banks of 16k. The Z80 address space
    is split ... b2 b1 xx - Page where ULA fetches
    video data from ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Hardware
  • What should be the base address to set for my codeHi, I am new here and I have a simple question but one which I have not found an answer to. When I am developming my programs what should I set th…

    ... spectrum. The z80 has to defer to the ULA for memory accesses ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... move the top of the z80's stack to 54016. You ... system? Nothing usually, but the ULA is generating an interrupt each ... . The Basic system puts the z80 in im1 mode, which means ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Development
  • Bought a speccy from ebay but need helpJust bought a speccy now so i don`t have it here yet but i bought one that might be broke have a read on what it says and tell me if you think it`s f…

    ... only the RAM and/or Z80 that's gone down. At ... worse, it's the ULA - almost impossible to find outside ...
    DEATH DEATH May 2006 Hardware
  • 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…

    ... current instruction is complete the z80 effectively calls a subroutine ... enables them so that the z80 will respond. When maskable ... provided by the ULA as peripheral id, the z80 will always ... table
    ; d100 - d2ff ------- z80 stack (512 bytes) set SP ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
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