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<1…15161718192021…34>
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... memory... failed (0x02)
    High port contention 1... passed
    High port contention ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... =0x01)
    Contended memory... passed
    High port contention 1... passed
    High port contention 2... passed
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... =0x01)
    contened memory...failer (0x01)
    HP contention 1...passed
    HP contention 2...failed (0xff ...
    Jose_Leandro Jose_Leandro November 2007 Hardware
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... measure the impact of buss contention introduced by using hi-res ... may not even use shared memory so it may have more ... also suffer from some bus contention caused by video refresh that ... machines certainly used shared video memory.

    Funny thing, the ...
    JamesD JamesD December 2007 Sinclair Basic
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... machines certainly used shared video memory.

    Funny thing ... an inserted cycle on each memory access in the 16k-32k ... calculator code makes more frequent memory accesses than regular code. ... on performance. The CPC's contention model has more impact -- ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Sinclair Basic
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... a difference are the memory-paging & contention timing differences, but I ...
    bobs bobs December 2007 Games
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... a difference are the memory-paging & contention timing differences, but I ...
    na_th_an na_th_an December 2007 Games
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... per 8 pixel long memory cell. With the memory "ninety degrees" ... T-state per memory read from screen memory (something like 250 ... and CAS for the memory, read the memory and then do something ... first place.

    Then contention would also be an absolute ...
    Winston Winston January 2008 Games
  • Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…

    ... every instruction, flag, memory location (and maybe contention and timing too, if ...
    ewgf ewgf March 2008 Emulators
  • Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…

    ... every instruction, flag, memory location (and maybe contention and timing too, if ...
    Robocop48k Robocop48k March 2008 Emulators
  • Another fusetest runWould anyone with a real machine be prepared to try the latest version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.zip]fusetest[/url], my…

    ... Machine type: 128K
    Contention offset: 0x09

    Contended memory... passed
    High port contention 1... passed ... Machine type: +3
    Contention offset: 0x08

    Contended memory... passed
    High port contention 1... passed ...
    Mr. Anonymous Mr. Anonymous March 2008 Hardware
  • Another fusetest runWould anyone with a real machine be prepared to try the latest version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.zip]fusetest[/url], my…

    ... /> Machine type: 48K
    Contention offset: 0x01

    ... )
    Contended memory... passed
    High port contention 1... failed ( ... 0xff)
    High port contention 2... skipped (B=0x01)< ... />
    and for interest contention.tap:
    [CODE]
    ...
    Fred Fred March 2008 Hardware
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... of ROM (around $3900 if memory serves me right). Developers used ... .

    13) The RAM contention models are different between the ...
    Jimmy Jimmy June 2008 Games
  • Accelerated spectrum?Hihi Has anyone managed to replace the Z80 in a spectrum with a Z80B? Just wondering if it'd be possible to have a couple of crystals switchable to…

    ... to the Z80 to control contention.

    You can use ... been done. This greatly speeds memory-memory and I/O ...
    Winston Winston July 2008 Hardware
  • Good 128k +2 emulator for Windows XPWhat emulator would you recommend for windows XP, to emulate 128k +2 Spectrum. I want to play Turbo Esprit like I did all those years ago! :-)

    ... .622, because the lack of contention in 0.666 is a ... is a killer)
    - The memory browser is horrible
    - Single ...
    Metalbrain Metalbrain August 2008 Emulators
  • QL and gamesWell,I am bit off topic but I cannot understand why the QL had no arcade games made for it and if it had, would they be vastly technically superior t…

    ... tougher contention between ULA and CPU comparing to ZX. Accessing contended memory ... 's speeds-up CPU - less contention with ULA as it doesn ...
    omega omega September 2008 Hardware
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... ;308952]I can solve the contention issue by paging in shadow ... /> I wouldn't worry about contention too much though, so long ... of running code from contended memory, storing graphics data in it ...
    Matt_B Matt_B October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... ;308952]I can solve the contention issue by paging in shadow ... /> I wouldn't worry about contention too much though, so long ... of running code from contended memory, storing graphics data in it ... so you have the video memory all to yourself. Write a ...
    BloodBaz BloodBaz October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... . For a full description of contention, I'd recommend that people ... so you have the video memory all to yourself. Write a ...
    Matt_B Matt_B October 2008 Development
  • Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…

    ... /> [*] Reading from the 128K's memory control port causes that byte ... (but probably not perfect) TS2068 contention (Philip Kendall).
    [*] Various other ...
    Fred Fred November 2008 Emulators
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... following the cycle requiring the contention to be applied.[/QUOTE]

    Contention would apply when IORQ+A0 ... cycle (either it's a memory or I/O bus cycle ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    [QUOTE=mcleod_ideafix;330315]Contention would apply when IORQ+A0 = ... Tech Info wiki! I/O contention isn't a simple on ... cycle (either it's a memory or I/O bus cycle ...
    Philip Kendall Philip Kendall January 2009 Hardware
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... them up in the slow memory below 32768 and just copy ... want to use into higher memory before I call it. Once ... /> Interestingly, the way that the contention works actually serves to regulate ... line. It's having less contention on the +2A that mucks ...
    joefish joefish March 2009 Development
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... transition from non-contended memory access to contentded memory access.

    contention starts, then we'll have ...
    csmith csmith April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... transition from non-contended memory access to contentded memory access.[/QUOTE]
    contention pattern is.

    Could ...
    zxbruno zxbruno April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... transition from non-contended memory access to contentded memory access.[/QUOTE]

    I hacked some of Phil's contention ... from fusetest that probes the contention pattern at a given tstate ...
    Fred Fred April 2009 Hardware
  • Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…

    ... +2A/+3 actually has more contention than the 128K/+2, but ... contention when MREQ isn't active. If all your instructions are memory ... have at least as much contention as the 128K/+2, if ...
    Philip Kendall Philip Kendall May 2009 New game ideas
  • Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…

    ... 128K ULAs will apply extra contention under the right conditions within ... the Z80 isn't accessing memory, so the code can run ... +3 applies slightly more contention when contention is applied but has less ... points of contention within a number of ...
    Bob Stains Bob Stains May 2009 New game ideas
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... themselves; any write to screen memory during the 128 T-States ... is so delayed by the contention that it drifts further and ...
    joefish joefish May 2009 Development
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... themselves; any write to screen memory during the 128 T-States ... is so delayed by the contention that it drifts further and ...
    Dr BEEP Dr BEEP May 2009 Development
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  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
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HitBox

Word Docs Hits
memory 21.8K 32.5K
contention 1.4K 2.4K

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