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Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... ]Using the floating bus, that method won't work on +3/+2A models ... .[/QUOTE]
In +2A/+3 there is no problem of ... -
Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
[QUOTE=antoniovillena;739433]In +2A/+3 there is no problem of ... routines).[/QUOTE]
The floating bus does not work on all ... looked at what kind of bus loading the 48k machine can ... -
Fixing/modding my new +3Hi, In december I won an auction for a working +3 with a dead floppy drive, + a Multiface 3, some disks and tapes, for a very low price (I think nob…
... would be to take a +3 mobo and put it in ... and hook up an external 3.5" drive. You would need ... start - modded a +3 motherboard with a supposed floating bus fix (resistor between ... if you're using a +3 motherboard you don't need ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... written to in groups of 3 bytes to setup the
3. Set the Interrupt Enable latches ...
vector specified on the bus. If the Z80 is currently ...
is depressed. Thus, the floating bus would cause these bits to ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... written to in groups of 3 bytes to setup the
3. Set the Interrupt Enable latches ...
vector specified on the bus. If the Z80 is currently ...
is depressed. Thus, the floating bus would cause these bits to ... -
Best 128k Speccy?Hi Which 128k Spectrum is the best from the point of view of the operating system, hardware design etc. Reason I'm asking is that I read on here th…
... run +3DOS software then a +3 motherboard with the hardware fixes ... you can have dual external 3.5" drives with a ... be retrofitted to support the "floating-bus" though.
If ... you maximum software compatibility. The +3 and +2A need various hardware ... -
X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... either Issue 2 or Issue 3 keyboard selected) so I'm ... of subtle timing issue, or floating bus issue maybe? -
X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... either Issue 2 or Issue 3 keyboard selected) so I'm ... of subtle timing issue, or floating bus issue maybe?[/QUOTE]
Doe ... -
'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…
... the Z80 and the ROM/floating bus or random data produced by ... noise/the floating bus. So think boarder with the ... reckon this changes every 2/3 seconds or so. So that ... -
Kempston joystick detectionIn both [url="http://skoolkit.ca/disassemblies/manic_miner/asm/34252.html#34332"]Manic Miner[/url] and [url="http://skoolkit.ca/disassemblies/jet_set…
... no idea about the ULA/floating bus thing.
Any idea ... easily a scanline.
The bus is either going to be ... and the +3 as they properly buffer the Video bus rather than ... -
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 …
... derived from original ULA timings - 3.5MHz, 7MHz, 14MHz and 28MHz ... the VGA clock). A rudimentary floating bus is implemented which allows games ... -
Grey +2 and +2A differencesWas the grey +2 incompatability of some of the Spectrum games fixed with the +2A -B?<br><br>
... 2A/B is a Spectrum +3 with a cassette deck instead ... same as in the +3, therefore all the places ... paging routines. Also the "floating bus" of the original 16/48 ... 't know if the floating bus was kept in the ... to the expansion bus when they designed the +3//+2A/B ... -
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 ... the ts2068 and only around 3-4% didn't work. That ... -
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…
Floating bus is the name given ... computer nothing will drive the bus. So the value on ... apart from +2A, +2B and +3 Amstrad models) there are separator ... resistors between the data bus for [the lower RAM ... ] and the CPU side data bus [CPU, ROM, upper RAM, ... -
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…
... uses the floating bus to synchronise the screen, causing +2A / +3 to lock ... up. Pentagon also does not exhibit floating bus behaviour ... -States. It checks for the floating bus and if it does not ... -
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…
... and +3 models return bits 0-6 of the floating bus if unused ... 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…
... a solution to add the floating bus port to ffh port.
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…
... "it does not have a floating bus" description that has been used ... about the +2A, +2B and +3.
What they should ... -
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…
... programmer relying on this for floating bus effects would still have to ... specifically test for +2A/+3 hardware before using this trick ... -
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…
... was originally looking at the +3 .dsk version which unfortunately ... mechanism in the form of floating bus reads. This improves the ... minimal (e.g. zero 3 bytes starting from #9B47 in ... on busier levels like Lv.3 *insert appropriately suggestive onomatopoeia as ... -
That's my last ZX Spectrum projectHi4all, I want to show my last project: https://www.youtube.com/watch?v=za_p9Mbfu0Y I wish to release a v1.0 very soon! Best regards
... times walks by +/- 2 or 3 microseconds per frame. Ojito, that ... I solved in PI 2/3 leaving the CPU-0 to ... the moment, nuclei 2 and 3 leave them sleeping the sleep ... of the Z80, contained memory, floating bus, accurately drawn both the edge ... -
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 ... -
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 ... the issue with the +2A/+3, as IIRC they don't ... -
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…
... the issue with the +2A/+3, as IIRC they don't ... ]
Sorry, if +2A/+3 don't have I/O ... 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…
... 128K/+2 from +2a/+2b/+3 is to use the fact ... Spectrums do not have the floating bus ("port #FF"). Therefore, you can ... if this computer has the floating bus (assumes that screen is filled ... can assume that pages 0..3 are always uncontended and pages ... -
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 ... anything similar to floating bus functionality on the +2A/+3 models, I believe ... -
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…
Thank you, @richl! You have just successfully beta tested the first Spectrum game to use the floating bus for synchronization on a +2A/+3. I’ll post more when I get home. -
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…
... 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…
... and the Amstrad floating bus pattern:
[code]
;Floating bus port detection ... /> cp (hl)
jr z,$-3
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