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<1…21222324252627…34>
  • The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…

    ... to wonder about the low value on the +12V rail. I ... truth. I now had proper value on the +12V line. Crossing ... /> I reworked all the new RAM socket joints and changed the ... upper memory RAM chips and I am now ...
    protek protek April 2014 Hardware
  • ZX Alien Breed - WIPI'm sure a lot of you have seen the discussion in the New Game Ideas area about a Speccy version of the classic Amiga game Alien Breed. I've been dro…

    ... level 3 - 'doubling' your available RAM for level sizing?

    value in lots of big empty ...
    MykeP MykeP April 2014 Announcements
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... the parameter routine to signal value unspecified.
    See Ian Logan ... mapped over the bottom of RAM.

    If you want ...
    Basher Basher April 2014 Hardware
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... to disable the upper ram chips on the spectrum ... so I know the upper RAM is causing that problem. ... Spectrum with 16K of RAM however this did not ... ULA starts with a random value. One of the bits ... when trying the Upper RAM test the border always appeared ...
    CornishManicMiner CornishManicMiner May 2014 Hardware
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... imagine there's a limited value in cutting costs.

    ram 6264, the eprom, of course ...
    zub zub May 2014 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... microcontroller respond to any video ram change in the ZX ... analog circuits, no video ram reading and contention problems.
    ram, with HDMI output...
    ... left or worse can be unstable horizontally.


    [ ...
    Fruitcake Fruitcake May 2014 Hardware
  • Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]

    ... return logic number of current ram page. For example on Pentagon ... return true number of ram page as one value D0-D5. This ... 2008 ) can return last writed value from port #7FFD (return true ...
    velesoft velesoft May 2014 Hardware
  • Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]

    ... return logic number of current ram page. For example on Pentagon ... return true number of ram page as one value D0-D5. This ... 2008 ) can return last writed value from port #7FFD (return true ... value with original bits layout)[/QUOTE]< ...
    Black_Cat Black_Cat May 2014 Hardware
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... set to #5B value = IM2 table is in slow ram = ulo show ...
    velesoft velesoft June 2014 Games
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... set to #5B value = IM2 table is in slow ram = ulo show ...
    Neil Parsons Neil Parsons June 2014 Games
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... problem to either the upper RAM chips or one of IC23 ... the first byte of upper RAM (01010101 and 10101010 respectively). If ... as anything other than the value poked, we can determine with ... reasonable confidence which upper RAM chip(s) have failed.
    balford balford June 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... the first byte of upper RAM (01010101 and 10101010 respectively). If ... as anything other than the value poked, we can determine with ... reasonable confidence which upper RAM chip(s) have failed.
    RAM is 16K and the ROM ...
    georgedb georgedb June 2014 Hardware
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... game register I set to value #5B. I have fix on ... address #FC00-#FD00 in ZX ram pages 0 and at same ... position on ram page 4.
    Game use ... only two ram pages - 0 and 1. Paging ... IM2 table to #FCxx will ram area #5B00-#5BFF free for ...
    velesoft velesoft June 2014 Games
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... test either all of upper RAM or just a small area ... of lower RAM. It stripes a random sequence ... checking and the value it read and the value it was expecting ... most of the common Spectrum RAM faults.[/QUOTE]From this site ...
    1024MAK 1024MAK June 2014 Hardware
  • Fire n' Ice, is it possible to convert it tp tap. or tzx?Wathching a little bit the video from this game in rzxarchive, and it is really outstanding. So I was wondering if its possible to make the trd file …

    ... long in the tooth. Showing RAM paged in would be nice ... game + faster music (but with unstable music speed and bad music ...
    velesoft velesoft June 2014 Games
  • UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…

    ... stored at the beginning of RAM, 6K from 16384 to 22527 ... CLEAR statement to change the value of RAMTOP. This means that ... using memory up to that value. Anything above that is then ...
    joefish joefish June 2014 Sinclair Basic
  • Why are rotozoomers on C=64 so fast ?Hi, I noticed rotozoomers on C64 are really fast. I'm not the best coder on Speccy but I know my pet I never succeed to do rotozoomer (or rotating ch…

    ... serious), proper hardware and excellent value for money. Funny thing is ... proper keyboard, revised hardware, 512K RAM, 3.5" disk drive etc ...
    Paddy Coleman Paddy Coleman June 2014 Development
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... , then it copies the new value from WORKSP to the new ... +10 (again) bytes of free RAM (plus the 80 bytes overhead ...
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... 23733 * 256

    The value printed should be:

    RAM returns. [COLOR="Lime"]212[/COLOR ...
    Brian Brian July 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... 23733 * 256

    The value printed should be:

    RAM returns. 0

    Now ...
    Brian Brian July 2014 Hardware
  • Loading games from a old PC to a speccy?Hi all I've got an old Pentium 1 200Mhz PC which I'm sure could load games to my speccy seeing as my tape drive is knackered... I remember when w…

    ... to the right location in RAM

    the z80 command ... this difference and float the value in a high or low ... the speccy the location in RAM to store the data
    slenkar slenkar July 2014 Sinclair Miscellaneous
  • Test screens for ZX PrismNot sure that this is *really* the right section for this request, but it's relating to new hardware I'm developing so let's start it off here - a mo…

    ... currently has 32K of video RAM (henceforth VRAM), split into 4x8K ... to ascertain not an RGBI value, but instead a 4 bit ...
    JeffB JeffB July 2014 Hardware
  • Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…

    ... may also find some low value capacitors to help and together ... falls to a much lower value. Hence limiting the fault current ... then the poor chip becomes unstable, so heats up more, which ...
    1024MAK 1024MAK July 2014 Hardware
  • Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…

    ... . Change a value of a resistor, chnage out the ram IC's ...
    IanJ IanJ August 2014 Hardware
  • Wanted: ZX81 boxed with 16k RAM PackI'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D …

    ... authentic retro experience complete with Ram wobble :)[/QUOTE]

    No ... mod and is extremely good value too.
    wile e coyote wile e coyote August 2014 Wanted
  • QL add-ons valueI've gotten my hands on some QL accesoires: - 2x Trump card 2, only disk interface I think (there's no RAM on them) - 2x CARE Electronics cartridge, …

    ... people went for something with RAM on it.

    Given ... by a Quanta sub-group - value I guess depends on whether ... - they can be useful, but value is only about ?25.
    rwap rwap September 2014 Hardware
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... possible values (because for every value of Y coordinate, the X ... significant bits with the same value as the bitmap address, that ... read a byte from bitmap RAM and another one to read ... an attribute from screen RAM. The datasheet states that the ...
    mcleod_ideafix mcleod_ideafix September 2014 Development
  • 48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…

    ... .

    C44 is the RAM 4116 +12V.

    Measurements ... C8 and I read increasing value from 85 to 95 mVrms ...
    Falco-F8L Falco-F8L September 2014 Hardware
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... versions using 8 bit wide RAM where it may be helpful ... a random start value (or maybe increasing start value with every new ...
    PokeMon PokeMon September 2014 Hardware
<1…21222324252627…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
value 9.4K 14.6K
unstable 444 481
ram 12.6K 21.4K

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