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Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... (or did not) emulate the floating bus at the time.
floating bus code with a [b]halt ... a more elaborate and precisely timed replacement for the floating bus code in ... -
Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... ?id=0004400]The Sentinel[/url] and [url=http://www.worldofspectrum.org ... .cgi?id=0004494]Sidewize[/url]: floating bus
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After that ... -
I just learnt that Spectrum has 1kB of unused ROMWell, man learns through all his life. I have just discovered that Spectrum has over 1 kilobyte of unused ROM memory, from address 14446 to 15615. Al…
... to include support for RS232 and the Sinclair network, but as ... pushing random values onto the floating bus -- or they don't bother ... -
RUSSIAN SOFTWARE and real ZXRussian ZX games is writed on russian ZX clones and support hardware feature TURBO OFF ( for ZX clone ZS SCORPION ). Russian ZX clone ZS SCORPION use…
... data from floating bus is writed to paging port. ZX128 and +2 use ... for 6bit mem.paging register and must be used only in ... I/O write cycle and disabled in read cycle. New ... -
People holding back the emulation sceneAs mentioned once again in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=22690"]this thread[/URL], some people think Ramsoft willfully…
... found more and more inaccuracies in RealSpec and downright dodgy ... literally littered with those, and no amount of complaints ... not in practice work, and more importantly, [i]information ... the first version of the floating bus documentation that was released. ... -
Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…
... more fiddly to use and less useful than it ... [/url]
And my "K-MOUSE TURBO 2008 ... fixed vector table adress (correct floating bus value):
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... K-MOUSE return to data bus correct 8bit low adress (# ... -
Maze Mania - How did they do it?Hi, I was looking at the game "Maze Mania" by Hewson Consultants, written in 1989. The game can be downloaded from here [URL]http://www.worldofspec…
... ) has backbuffer with terrain and scroll it by one pixel ... ) and copying is done just behind beam generating screen (floating bus check ... the sprite to the backbuffer and copy backbuffer to screen ... background), scroll background a and draw tiles on edges.
Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.
... .com/wiki/Z80"]here[/URL], floating bus tests via [URL="http://scratchpad ... .com/wiki/Floating_bus"]here[/URL], and the fusetest source is available ...Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.
... com/wiki/Z80"]here[/URL], floating bus tests via [URL="http:// ... /wiki/Floating_bus"]here[/URL], and the fusetest source is available ... z80test.tap[/url], tests FLAGS and MEMPTR. SpecEmu just passed ... them all. And passed the fusetest for 48 ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... with the interrupt sync code and this tells you if your ...
in a,(c) ; read floating bus on cycle 14338
in a,(c) ; read floating bus on cycle 14339
Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…
... flag byte) without screen corruption and proper fade to black when ... with the headerless data blocks and the fact you have ... the +2A/+3 "floating bus" (or lack of) issue and I even hacked ... order constraints mentioned by velesoft?) and/or ROM differences that are ...Which speccy do you use & why ?I`m lucky enough to have the choice of using a 48K original, a 48K+ and a 128+2B Sometimes I prefer the 128 because of it`s nice keyboard, crisp pic…
... +3 (no floating bus, edge connector differences, broken sound) and if you can ...Which speccy do you use & why ?I`m lucky enough to have the choice of using a 48K original, a 48K+ and a 128+2B Sometimes I prefer the 128 because of it`s nice keyboard, crisp pic…
... 3 (no floating bus, edge connector differences, broken sound) and if you ... br /> Hmmm, that all well and good, but sound fix requires ... to a blank eprom and an eprom burner which ... tenner.
Bus issue I'm not that ... work on +3 bus anyhow and don;t use any ...The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…
... . If memory contention is disabled, it'll do its timing checks against ... the screen memory and probably conclude ... running on a Pentagon, and set the timing up for that. It ...Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... it (even the original patents and gate masks). See for example ... has to know very well and in depth what's going ... rely on that complex ULA/floating bus behaviour, and any FPGA-based clone ...Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... " models do implement the floating bus behaviour, and the only 128K models that ...Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... " models do implement the floating bus behaviour, and the only 128K models that ... if it's actually a floating bus issue or other pesky incompatibility ...+3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…
... computer is powered on, and assuming that the Z80 ... Z80 will read "FF" (floating bus), which is the opcode of ... SP is pointing at) and will go to address ... will be filled downwards, and after a short time, ... as SP continues decreasing, and finally the bitmap RAM will ...Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... the picture, it finds nothing (floating bus) and hence, the value read is ... , that becomes visible through the bus-divider resistors.
My ... low memory (5V, 12V, -5V) and see if there are ok.Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... at the 7805 regulator). And the Spectrum internally generates + ... passive (resistors, capacitors) and don't often die.
floating bus) and hence, the value read is ... , that becomes visible through the bus-divider resistors.
ULA Hacks?During some of my madder experiments back in the 80's I discovered some interesting ULA hacks such as being able to read the raster position through …
The floating bus (raster) and plenty of other tech details are documented [URL="http://scratchpad.wikia.com/wiki/ZX_Spectrum_technical_information"]here[/URL].worth buying a zx spectrumAs i have been watching Micro Men i have been really thinking about buying another Spectrum. Now as i grew up in the 80's and was a massive speccy fa…
... hardware and rom mods?[/QUOTE]
This one adds floating bus support ... for the 48K or 128K and using all of the hardware ...More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... IMHO it's far better, and more in the spirit of ... most elegant thing that works and let the software people ... and wouldn't allow for that choice. Similarly, if there are timing ... just have to learn and work with the contention and timing, and just trust that ...Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
... A (see my picture) and ends with bottom border ... amount of time between D and A ("vertical retrace") ... value into the data and/or attributes of the ... the screen, and then repeatedly read the floating bus until that ... anything without a floating bus, obviously :-)Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
... 've read a bit about floating bus and I'm confused:
bus, which will be a display ...speccy hardware differences?yup, ive escaped from chit chat for a second ive been reading the last issue of retro gamer and theres an article on the commodes sid chip it was s…
... [*] Issue 2 48K machines and Issue 3 48K machines handled ... ).
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And as Andrew says, the differences ... and +3 are significant, the most famous of which is the "floating bus ... ", which is what causes Arkanoid, Cobra and Sidewize ...Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... the boundary between the second and third thirds of the ... ULA scans the screen, and the scanline is catching up ... using the floating bus (not compatible with all Spectrum models), and waiting for ... sprite (covering the old position and the new position) from the ...Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... .tap file as a parameter and LOAD "" inside the emu)
[*]Primitive floating bus emulation (Renegade now runs at ...Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... /> After dealing with contended memory and the floating bus, I'll add TZX ... accomplished, the real time TAP and ultra-speed TZX variations will ...Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... real 4:3 Speccy screen and the native aspect of ... will be somewhat more spaced and still will use the ... . still no accurate contended memory/floating bus emulation.)
This ... test the forthcoming debugger/monitor and other features without having to ...
