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  • Contended memory and TritoneQuick question regarding contended memory...<div style="font-style: normal;"><br></div><div style="font-style: normal;">I'm testing ideas with Triton…

    Yes, the drum data is out of contended memory. I can't notice any difference when I run it all out of contended memory so I think I'll leave like it is unless I find any other issue further on.
    Thanks for your help!
    reidrac reidrac June 2015 Development
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... Sinclair 2068. The section on contended memory timing also applies to the ... contended, whether it is HOME RAM, EXROM, cartridge memory or bus unit memory ... " and that "the section on contended memory timing ...
    Fred Fred June 2015 Hardware
  • No$ZX, a Spectrum emulator with a lot of debugging featuresI was just going through my Spectrum folder on my laptop, and I found No$ZX, a free ZX Spectrum emulator which you almost never see mentioned, but I …

    Its good for debugging, much like EmuZWin (or EmuZGL), but its not good for gaming.
    Sidewize doesnt work, as most of the games that require full multicolor and contended memory emulation.
    Pegaz Pegaz July 2015 Emulators
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    ... etc.


    Regarding contended memory, play 16k games on your ... I looked at this was contended memory sped the 16K games (& ... the state is stored in memory and then for your emulator ... cause an event when that memory is touched, then you upload ...
    Korinel Korinel July 2015 Emulators
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    ... meant was the "lack" of contended memory would speed the 16K games ... of the game in the contended memory region...

    And I ...
    Korinel Korinel July 2015 Emulators
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... MHz pc, with full multicolor / contended memory emulation and no bugs and ...
    Pegaz Pegaz July 2015 Emulators
  • Memory testersHi, Just wondering which software people are using to test the memory in their spectrum. I have been using Zorn's memory tester as described here:…

    ... also try this Russian mem test utils.

    http://vtrdos ... /system/AUMT.zip (Another Universal Memory Test)
    http://vtrdos.ru/system ... /MEMT1_03.ZIP (Memory Test)
    http://vtrdos.ru/system ...
    Pegaz Pegaz July 2015 Sinclair Miscellaneous
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    Thanks joefish, contended memory is on my list.

    Hi Arjun, You should now see the emulator as I've added India (plus US, AUS, CAN & IRE).
    MikeSitch MikeSitch July 2015 Emulators
  • EmuZwin 128k banks in assembler Having looked at the assembler help file " ORG [{ RAMn | ROMn },] #target_address [, #dest_address ] Defines target assembling address and ta…

    ... with calling routines in paged memory
    Use Banks 4 and ... (logical 2 and 3) (uncontended memory) for frequently accessed data e ... 3 (logical 0 and 1) (contended memory) for infrequently used data storage ...
    dbolli dbolli August 2015 Emulators
  • Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …

    ... Complica DX, reusing the same memory area was necessary because the ... it would not fit in memory. Even so, it's done ... . It even includes a full memory map to help understand where ... at beginning of program in contended memory, so the entire program logic ...
    Einar Saukas Einar Saukas August 2015 Development
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    Thanks RMartins/Korinel, I'll take a look at the floating bus & contended memory tests.

    Thanks Arjun, I'll look at the tape manager scrolling and .tap files.
    SpeccyBoy SpeccyBoy September 2015 Emulators
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    ... to the store which fixes contended memory and floating bus (all tests ...
    SpeccyBoy SpeccyBoy September 2015 Emulators
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    Thanks, I see the issue.

    Looks like I need to find some more contended memory tests as I'm passing zxspectrum4.net and fusetests. Hopefully I won't need to reverse engineer the game to find the bug....
    SpeccyBoy SpeccyBoy September 2015 Emulators
  • New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…

    ... need to find some more contended memory tests as I'm passing ...
    rich_chandler rich_chandler September 2015 Emulators
  • How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…

    ... models have different pages contended. On the spectrum memory access to video ... know which pages are not contended. Far worse is a ... table is located in a contended memory bank (this means the I ... register is pointing into a contended bank). This flaw will not ...
    Alcoholics Anonymous Alcoholics Anonymous October 2015 Hardware
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... logic, so don't have contended RAM.

    If the ... have been free of any contended RAM.

    [b][i ... inves spectrum+ hasn't got contended memory either ;)
    chernandezba chernandezba November 2015 Emulators
  • The Infeasible GameMy new game will be available early next year. One or two little bits to sort and then I need to play test all the levels. For now, here is a short v…

    [quote="Mr Millside;840484"]Not sure what you mean by "rain"?[/quote]

    He means your game will produce display corruption on at least the 48K, 128K and +2 Spectrums due to the IR register pair addressing contended memory.
    Woody Woody November 2015 Brand new software
  • The Infeasible GameMy new game will be available early next year. One or two little bits to sort and then I need to play test all the levels. For now, here is a short v…

    ... the IR register pair addressing contended memory.[/quote]

    Would be ...
    Mr Millside Mr Millside November 2015 Brand new software
  • No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…

    ... the extra time needed for contended memory access. For example, sprites in ... effects further, try changing the Memory model to [i]No contention ... contention had been the standard memory model for Spectrums, then game ...
    GReW GReW November 2015 Development
  • 1986-2016.I'm early, but I'm tired of 1985. So here's the annual thirty-years after topic about Speccy games.

    ... point where it's a memory test, this is fair enough with ...
    dm_boozefreek dm_boozefreek November 2015 Games
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    That's a fix for the ULA snow effect when the Z80's I register is set to point at contended memory. Won't do anything for the picture quality.

    B
    balford balford December 2015 Hardware
  • NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…

    ... that defines the extent of contended memory. It is the entire RAM ... of this 16k bytes is contended.

    In a 48k ... 32k byte area is not contended because another eight DRAM chips ... byte machines, the memory area that is contended is 64k bytes because ...
    1024MAK 1024MAK December 2015 Games
  • Problem with 128k +3Got this a while ago on Ebay, just got around to trying it out and face the following problem. Displays garble block on the screen and keyboard does…

    ... uniform?

    The startup memory test routine on a +3 sets ... or IC6.

    (Source - memory test routines at 0x0130 and 0x0367 ...
    balford balford January 2016 Hardware
  • Knight Lore disassemblyHi, Not quite sure if this belongs here or in "Games" but figured it's more likely that developers would be interested. I've just released the …

    ... , so BBC version focuses on memory usage.

    [quote="tcdev ... the blog that Pentagram changed memory layout without a reason, but ... think that reason was Spectrum contended memory - i.e. RAM at $4000 ...
    mariuszw mariuszw February 2016 Development
  • Knight Lore disassemblyHi, Not quite sure if this belongs here or in "Games" but figured it's more likely that developers would be interested. I've just released the …

    ... , so BBC version focuses on memory usage.[/quote]
    Ah, OK ... the blog that Pentagram changed memory layout without a reason, but ... think that reason was Spectrum contended memory - i.e. RAM at $4000 ...
    tcdev tcdev February 2016 Development
  • New version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…

    ... debug tests, maybe is some contended memory/ports related problem

    chernandezba chernandezba February 2016 Emulators
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