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<1…17181920212223…34>
  • Paging memoryI've been thinking about a possibility of paging blocks of memory to and from disk. Imagine dividing usable 32KB of Speccys RAM (why do they call it …

    ... a Spectrum's lower 16K RAM as 'non-existent' ... ]any[/I] tricks to access it. Nor is it incredibly ... RAM, and entire rest for loading the data (and the access ... QUOTE]
    PC video RAM is essentially a separate ... just that video RAM is not RAM but virtual memory ...
    RetroTechie RetroTechie October 2011 Development
  • Paging memoryI've been thinking about a possibility of paging blocks of memory to and from disk. Imagine dividing usable 32KB of Speccys RAM (why do they call it …

    ... wrong:
    1) RAM is acronym for Random Access Memory - and the ... video RAM fully fits to ... Hisoft Basic compiler using video ram as temporary scratchpad for ... Not just that video RAM is not RAM but virtual memory is ...
    Fikee Fikee October 2011 Development
  • Paging memoryI've been thinking about a possibility of paging blocks of memory to and from disk. Imagine dividing usable 32KB of Speccys RAM (why do they call it …

    ... else, it's still RAM. It's Random Access Memory - you can ... , that's the definition of RAM. It's in the very ...
    na_th_an na_th_an October 2011 Development
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... out to be bad upper ram?[/QUOTE]

    From another ... standard 4164 device, with proper access time. The 4164 chips are ...
    riad riad October 2011 Hardware
  • Done the unthinkableI bought Spectaculator today because I am sick of how unstable ZX Spin has become. I have to admit it looks great on my laptop plugged through to my …

    ... friendly menus and easy to access options. It might be old ... need exact emulation of video RAM or the R register or ...
    ewgf ewgf October 2011 Emulators
  • Done the unthinkableI bought Spectaculator today because I am sick of how unstable ZX Spin has become. I have to admit it looks great on my laptop plugged through to my …

    ... friendly menus and easy to access options. It might be old ... need exact emulation of video RAM or the R register or ...
    rich_chandler rich_chandler October 2011 Emulators
  • CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…

    ... screen off full tilt external ram speed
    oh and ... slightly less than the internal ram?

    has anyone seen ... blitter dumping stuff in video ram - would this have required a ... for processor and dma to access same ram addresses?

    what ...
    Ralf Ralf October 2011 Chit chat
  • CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…

    ... screen off full tilt external ram speed
    oh and ... slightly less than the internal ram?

    has anyone seen ... blitter dumping stuff in video ram - would this have required a ... for processor and dma to access same ram addresses?

    what ...
    polomint polomint October 2011 Chit chat
  • CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…

    ... screen off full tilt external ram speed
    oh and ... slightly less than the internal ram?

    has anyone seen ... blitter dumping stuff in video ram - would this have required a ... for processor and dma to access same ram addresses?

    what ...
    Wookiee Wookiee October 2011 Chit chat
  • Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…

    ... 4
    or 7 ; select ram page 7
    ld ($5b5c ... /> ld c,5 ; shared-read access
    ld d,0 ; don ... 4
    and $f8 ; select ram page 0
    ld ($5b5c ...
    cmonkey cmonkey October 2011 Development
  • The Elder Scrolls V: Skyrim...has been confirmed! [url]http://www.computerandvideogames.com/article.php?id=280129[/url] A direct sequel to Oblivion, and has been in developme…

    ... Extreme MoBo
    6Gb RAM
    1792Mb nVidia Gainward ... sound card
    Internet access for Steam activation
    ... processor
    2GB System RAM
    6GB free HDD ... of RAM
    DirectX compatible sound card
    Internet access for ...
    Daren Daren November 2011 Chit chat
  • Pac-Man EmulatorMy Pac-Man Emulator for the Spectrum +2A/+3 is now available for download from: [url]http://simonowen.com/spectrum/pacemuzx/[/url] You'll need to su…

    ... /> [COLOR="Silver"]How much ROM/RAM does Pac-Man run in ... just to have access to low addresses of RAM?[/COLOR] Never mind ...
    joefish joefish November 2011 Brand new software
  • New SpecBAS available - v0.710Been a while, but I've just uploaded the latest build of SpecBAS. This one now supports tilemaps (with rotation and scaling) and added OVER mode (XO…

    [QUOTE=ewgf;579158]Thanks for this, Dunny, but is there an archive of programs I can try for it?[/quote]

    I shall pop an archive of demo programs up for you. Here you go:

    [url]https://sites.google.com/site/pauldunn/demos.zip[/url]< ...
    Dunny Dunny November 2011 Sinclair Miscellaneous
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... .

    The RAM is being accessed all the ... from the CPU to access memory doesn't take ... the gate array will access RAM only when it's strictly ... needed, and the access won't last more than ... RAMs used have 150ns of access time, so 280ns is ...
    mcleod_ideafix mcleod_ideafix December 2011 Hardware
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... , having less RAM and there being no direct access to the video ...
    Matt_B Matt_B December 2011 Sinclair Miscellaneous
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... the CPU must happen to access the ROM at least now ... be happening on the lower RAM address lines when the border ... , but not the contents of RAM. Perhaps it's a 'feature ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... the CPU accesses the lower RAM.

    I've made ... address lines at the lower RAM changing in what seems to ... the case of a CPU access. In an Issue 2 Spectrum ...
    Zorn Zorn December 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... that occurs when the lower RAM isn't working correctly ... least some of the lower RAM is faulty, I also ... method all the lower RAM ICs can be removed ... should be specified with an access time of 200ns or ... possible to replace the lower RAM with a fairly simple ...
    Zorn Zorn January 2012 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... ]

    Neither specify the access speed, so you'd need ... its not connected to the ram Im getting -1v not the ... going to remove all the ram chips and put sockets in ...
    Marshall Marshall January 2012 Hardware
  • Would anyone be interested in......Hi, I'm wondering if there would be much interest in an expansion card for the speccy that gives a VGA output with enhanced gfx & sound capabilities…

    ... buffering while avoiding dual port RAM (because it's very expensive ... can quite happily multiplex access to an external RAM. I haven't ... about how fast the access to the RAM would need to be ... of the FPGA's block RAM as a line buffer.
    Winston Winston January 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... have double checked the 4116 RAM in another Spectrum and it ... CPU's read access to some of the lower RAM or perhaps ... installed. This led to lower RAM corruption in another Spectrum, but ...
    Zorn Zorn January 2012 Hardware
  • AY-interface for ZX81 (at last ;) )Hi, it exists finally ;) - compatible with the most standard one - ZonX. [url]http://www.sellmyretro.com/offer/details/Brand_New_Sinclair_ZX81_MrX_A…

    ... 32K configurable RAM plus an SD card reader for instant access.
    rwap rwap February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... finger.
    If you have access to another working zx you ... can socket z80 and lower RAM and try with new chips ...
    kpuchatek kpuchatek February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    [QUOTE=kamilb1998;601859]Had access to a multimeter today and ... is /CAS for the lower RAM and attaching a voltmeter to ... power supply from the lower RAM, either by cutting the circuit ...
    Zorn Zorn February 2012 Hardware
  • Commodore 64 - First time trying - REVIEW & Pictures!Right, so the 2nd hand shop was selling this Commodore and accessories. So I decided to buy it, as I've never had a Commodore and this is my first ti…

    ... CPU and the video system access the RAM on alternate cycles so ...
    Matt_B Matt_B February 2012 Sinclair Miscellaneous
  • Double Dragon Remake: The Development ThreadOk guy's, so this is the new thread that will be focusing on Jim Bagley's development of the Double Dragon remake that was first proposed by myself a…

    ... either disable interrupts while you access that extra memory, or repeat ... is always in an uncontended RAM bank. I'm not sure ...
    jonathan jonathan February 2012 Development
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    I have about 20 43256 ram chips here, a pound a pop plus postage.

    They are all used but good working chips, 120ns access.
    shammster shammster February 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... address multiplexor for CPU access to the lower RAM. In earlier Spectrums ... address is presented to the RAM for only about 20ns and ...
    Zorn Zorn February 2012 Hardware
  • raspberry pion the bbc news at the moment..

    ... learn ASM and you had access to more ram that way.
    fog fog March 2012 Chit chat
  • raspberry pion the bbc news at the moment..

    ... ASM and you had access to more ram that way.[/QUOTE]
    Dunny Dunny March 2012 Chit chat
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Latest Posts

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    harriusherbartio on 12:06PM
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  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
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    mel the bell on April 21
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