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'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... pattern compared to if the Spectrum is disconnected or switched off ... the Z80 and the ROM/floating bus or random data produced by ... noise/the floating bus. So think boarder with the ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... to replicate any particular Spectrum model precisely, but it ... having no access to Spectrum hardware for several years, ... Prism currently models a 512K Spectrum with no memory contention ... VGA clock). A rudimentary floating bus is implemented which allows games ... -
Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …
... the emulation of peripherals (or floating bus, for that matter), so if ... are for a bare 48k spectrum with no peripherals attached, This ... -
Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …
... are for a bare 48k spectrum with no peripherals attached, ... work regardless of the floating bus and the peripherals attached?< ... to test contention requires getting floating bus emulation right first. For ... quite glad that the floating bus tests don't depend ... -
New multisystem floppy interface (spectrum 16Kb/+2A/CPC464)Dear all, I would like to show you my new extern floppy interface. Same interface can be used for both, CPC and Spectrum systems. CHARACTERISTICS …
... tried the prototype in a Spectrum +2A it worked fine, just as ... I tried it in a spectrum 16Kb with superupgrade, I found ... the 10K resistor to the spectrum bus and reset it continuously.
New multisystem floppy interface (spectrum 16Kb/+2A/CPC464)Dear all, I would like to show you my new extern floppy interface. Same interface can be used for both, CPC and Spectrum systems. CHARACTERISTICS …
... tried the prototype in a Spectrum +2A it worked fine, just as ... I tried it in a spectrum 16Kb with superupgrade, I found ... the 10K resistor to the spectrum bus and reset it continuously.
128K Spectrum - can't figure out what's wrongLong time no post :) So I have this 128K Spectrum (+2 ROMs) that I cannot for the life of me figure out where the problem lies. Let's take a look a…
... data would not be stable (floating bus effect). If it was a ... wise to check that the Spectrum schematic you worked from is ...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…
... number of games depend on floating bus behaviour. They will sit in ... .
With a spectrum emulator rom equivalent installed, most ... I suspect first generation ZX Spectrum games would work on ... you can add a virtual spectrum emulator cartridge to try ...Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…
... +2A and +3 models return bits 0-6 of the floating bus if ... all models to use a floating bus for frame sync without hardware ...Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…
... the 470ohm resistor but my +2A became unstable so in the ... floating bus port to ffh port.
But as I said , the +2A ... /+3 do have floating bus port, but doesn't ...Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…
... byte gives 256 combinations. The Spectrum ULA just uses A0 low ... , all of which will return "floating bus" values.
As soon as ... number of unused and therefore "floating bus" addresses.
[b][i ...Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…
... for floating bus effects would still have to specifically test for +2A/+3 ...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…
... might know, this is partly floating bus-related, but the actual issue ... what you see on the +2A and later models. This I ... mechanism in the form of floating bus reads. This improves the situation ... 's finally music on the +2A's among other things :) )
Question - SAMS Timex Sinclair 2068 Beginner/Intermediate GuideHi all, I just acquired a T/S 2068 and the a book that came with it is, SAMS Timex Sinclair 2068 Beginner/Intermediate Guide. On page 18 of thi…
... follow up to the spectrum. Their spectrum failed FCC emissions which ... I transferred hundreds of spectrum games to my disk ... important is probably the floating bus. Some spectrum games will try to ... read bytes from the floating bus ...Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…
... isn't consistent with the floating bus behavior on 48K etc (255 ... new games on all proper Spectrum models, but the unified scheme ...Spectrum 128k+2 on tvHi, I want to buy a 128+2, did have one years ago, can i let it work on a flat tv screen, if so what do i need to do this.
... with games that need the floating bus (Sidewize, Arkanoid etc), and operates ... />
If you have a +2A (black) then you need a ...Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... equipped with 8Kb ROM (floating-point support) and 1Kb of ... by the {ZX Spectrum 128 +2A|Amstrad}.#The package included ... br />
ZX Spectrum 128 +2A - Essentially a redesign of the ... included the book {ZX Spectrum +2A Manual|Amstrad}.#The ROM image ...Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... equipped with 8Kb ROM (floating-point support) and 1Kb ... " (Scientific), a reference to floating-point support that wasn't ... br />
ZX Spectrum 128 +2A - Essentially a redesign of ... package included the book {ZX Spectrum +2A Manual|Amstrad}.
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... on a +2A/+3) get the result of the "floating bus". This will ... ]
In Timex machines floating bus is 0, if I remember ...Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... on a +2A/+3) get the result of the "floating bus". This will ... ]
In Timex machines floating bus is 0, if I remember ... 's the issue with the +2A/+3, as IIRC they don ...Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... 's the issue with the +2A/+3, as IIRC they don ... .[/quote]
Sorry, if +2A/+3 don't have I ... by I/O) but exhibit floating bus, then this idea is useless ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... distinguish between 128K/+2 from +2a/+2b/+3 is to use ... Spectrums do not have the floating bus ("port #FF"). Therefore, you can ... if this computer has the floating bus (assumes that screen is filled ...Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... a 16k ZX Spectrum and a 48k ZX Spectrum is that the ... area will respond with a "floating bus" value (normally 255, but may ... time). Unless of course, the Spectrum is actually a faulty 48k ... (the address on the address bus is the current contents of ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... represent bytes read off the floating bus port, #0FFD in this case ... 's anything similar to floating bus functionality on the +2A/+3 models, I ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
Forget ZEsarUX behaviour with floating bus port on +2A, it does an aproximation, not ... the past on my real +2A, as you may see on ... has, some kind of a floating bus, but I still don't ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... ] that uses the floating bus for syncing on all Spectrum models. As a ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... when I try it via +2a mode in Spectaculator. I dunno ... doesn’t emulate the floating bus on a +2A/+3 properly (or at ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
I suppose, it's need to test floating bus with extended memory paging modes of +2A/+3, for full information.Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... for floating bus testing in extended paging mode of +2A/+3? Maybe floating bus reading ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... .[/quote]
Right. Using the floating bus as a way of syncing ... /> So, neither the quirky +2A/+3 bus behavior, nor the “standard” 48K ...
