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JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... has to do with the floating bus. None of our old 128K ... reported to crash on 128/+2 hardware, and all of them ... on what's on the floating bus.
Anyways, the fix ... -
Fusetest port 0x7FFD test resultsHi, I'm adding the Spectrum 128K emulation to my FPGA core running on the V6Z80p platform. I'm doing some tests; running Fusetest, the machine is se…
... paging register, probably from the floating bus.[/QUOTE]
OK! Finally ... all the bits 0,1,2,3,4 during the whole ... -
48K/128K classificationI'm sorry if I've looked in the wrong places and not found it, but what are the rules regarding a game being listed as either: ZX Spectrum 48K ZX Sp…
... )
* requires an issue 2 keyboard (some early software)
2 (things that use the original ... UK 128 or UK original +2 (HiSoft BASIC 128 doesn' ... English ROMs)
* requires the floating bus (original release of Arkanoid)
"The Amazing Rocketeer", compatible with real hardware?I've managed to create a physical copy for myself of [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0017643"]this game by John Fotou[/URL] bu…
[QUOTE=LCD;643575]Which +2?[/quote]
You mean:
... A) early grey +2 (1986) - buggy HAL as per ... /> If the game requires the floating bus it will only work on ...ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…
... ?name=P1030320_even.MOV&can=2&q=[/url]
2&q=[/url]
floating bus. If register I is between ... (1th and 2th bytes)
2) The lower 7 bits of ...Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…
... MkI grey +2 (not the Mk2 grey +2 which almost certainly ... the noise on the bus you may be in ... a resistor to simulate the floating bus (then Arkanoid etc. wiil ... * replace the 4 ROMs with 2 copies of the ROMs from ... toaster and Mk I Grey+2 the wrong banks are ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... but with proper PAL syncs. Floating bus and "ULA snow" is ... odd with my Spectrum issue 2 I'm using. According ... ROMCS from the rear bus into an input signal, ... I'm using the PS/2 keyboard external interface.
... pin from the rear bus had been pulling ROMCS ...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…
... 2012 fails due to a floating bus wait routine. It can be ... it's caused by the floating bus as well.
As ... .
[*]Red Heat: Reached level 2 without problems. The Hit Squad ...Spectaculator 8 is out!By the looks of it, Jonathon has just release Spectaculator 8. No write up on new features yet. Will have to wait. [url]http://www.spectaculator.co…
... Kempston mouse interface use only 2 buttons on bits D1 and ... bitst D2-D7 are transparent (floating bus). But this original device are ...The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…
... place)
2. The resistors are responsible for the 'floating bus' effect, ... , not knowing about the floating bus, and broke some many ... br />
Edit: the floating bus is this: when the z80 ... the Harlequin. The resistor bus decoupling must live on!
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... .
* and that the +2 didn't get any important ... />
* The fact that all +2's have terrible tape decks ... .
* That the grey +2 becomes more orange and green ... fixable. You can fake the floating bus by adding a resistor and ...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 …
... every frame. This is almost 2/3 of the available time ... you plan to leave the floating bus synchronization in like in the ... used in Cobra).
2. It's [i]just[/i ... logic from drawing routines, designate 2-3 buffers for 'onscreen objects ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... whenever it wants to;
2. "ULA" attempts reading a byte ... not think there was a floating bus on Pentagon ("port #FF" was ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... whenever it wants to;
2. "ULA" attempts reading a byte ... not think there was a floating bus on Pentagon ("port #FF" was ... />
Indeed, there is no floating bus behavior in the sense of ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... soundly broken (hence issues with floating bus, interrupts etc) but there is ... original Z80 ran at only 2.5 MHz so can't ...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…
... +3 motherboard with a supposed floating bus fix (resistor between D7 of ... the floppy port and have 2 external drives)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. …
... and CTRLB.
2. Set the Interrupt Vector address ...
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. …
... and CTRLB.
2. Set the Interrupt Vector address ...
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…
... the hardware fixes inside a +2 case is the way to ... is poorly made. The grey +2 has most of the hardware ... be retrofitted to support the "floating-bus" though.
If you ...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…
... by the absence of the floating bus effect, and by changes in ... /> In my opinion, the original +2 is probably the best all ... .jpg[/IMG]
Original +2 (grey case):
[IMG ...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…
... /Interface/Interface2_Circuitry.htm[/url]
Floating bus support: [url]http://www.secarica ... .php?p=466908&postcount=2[/url]
Spectrum SE (v1 ...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…
... ) (tried with both the "Issue 2 Keyboard" setting ticked and unticked ... in SpecEmu (with either Issue 2 or Issue 3 keyboard selected ... 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…
... ) (tried with both the "Issue 2 Keyboard" setting ticked and unticked ... in SpecEmu (with either Issue 2 or Issue 3 keyboard selected ... of subtle timing issue, or floating bus issue maybe?[/QUOTE]
Doe ...Which Speccy is best?Has anyone done any analysis to suggest which of the various Speccy models is the most technically reliable?
... standard machines, then the grey +2 is considered the best from ... get a +2B, do the floating bus mode, and install the old ...'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 ... I reckon this changes every 2/3 seconds or so. So ...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 ... stopped working with the Black +2 and the +3 as they ... properly buffer the Video bus rather than relying on resistors ...Grey +2 and +2A differencesWas the grey +2 incompatability of some of the Spectrum games fixed with the +2A -B?<br><br>
... know which games the +2 had problems with though ... paging routines. Also the "floating bus" of the original 16 ... t know if the floating bus was kept in ... Toastrack') but the grey +2 is basically a Toastrack with ... changes to the expansion bus when they designed the ...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…
... in#FF only one or 2 cannot be reliably replaced with ... another game that uses the floating bus to synchronise the screen, causing ... Pentagon also does not exhibit floating bus behaviour, so this fix would ... a 48K, Toastrack or grey +2 the value will be something ...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…
... low for selection. So 256/2=128 I/O port addresses ... , 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…
... an unmodified 128 or grey +2 to crash due to a ... programmer relying on this for floating bus effects would still have to ...
