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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…
... pushing random values onto the floating bus -- or they don't bother ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... bottom border by reading the floating bus and looking for a particular ... -
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…
... / +2(grey), then data from floating bus is writed to paging port ... -
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…
... the first version of the floating bus documentation that was released. We ... -
Batman crashes on MobileZXDear all, I'm one of the authors of MobileZX ([url]https://sourceforge.net/projects/mobilezx/[/url]) and find that Batman crashes within a few secon…
There's a few more games listed in the [URL="http://scratchpad.wikia.com/wiki/Floating_bus"]floating bus[/URL] section of the tech wiki that probably also fail then. -
TIMEX Sinclair 2068 => ZX Spectrum/Timex2048?Hello. I have opportunity to buy Timex Sinclair 2068. According to www sites dedicated to Timex machines, TS 2068 can handle only 7% (!) of Spe…
... 50hz, different T-states, no floating bus on port #FF). More than ... -
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…
... 0xff on the data bus at interrupt time, thus ... with pull-up data bus via resistors 150 Ohm) ... fixed vector table adress (correct floating bus value):
===========================================
... K-MOUSE return to data bus correct 8bit low adress (# ... -
Games not working on Timex 2048Timex 2048 is a very good Spectrum 48k clone, over 90% of games work fine. But there are also not working games or working but not properly. Is there…
... the SCLD data bus from the z80 data bus with resistors as ... done instead with a standard bus transceiver chip. A consequence is ... TC2048 doesn't support a floating bus on any port (that I ... -
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…
... just behind beam generating screen (floating bus check). when it is finished ... -
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 ... -
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 ... -
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 …
...
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…
... aware of the +2A/+3 "floating bus" (or lack of) issue and ...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.
... /> Contended IN... passed
Floating bus... passed
Contended memory... ... /> Contended IN... passed
Floating bus... passed
Contended memory... ... Contended IN... failed (0xfd)
Floating bus... passed
Contended memory... failed ...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…
... issues affecting the +3 (no floating bus, edge connector differences, broken sound ...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…
... issues affecting the +3 (no floating bus, edge connector differences, broken sound ... one for tenner.
Bus issue I'm not that ... that to work on +3 bus anyhow and don;t use ...+2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …
... effects routine also used the floating bus so I've bodged around ...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…
... (Z80 undocumented opcodes, memory contention, floating bus, fixed number of T-states ...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…
... tricks they threw at it (floating bus, contention, whatever), then, to me ...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…
... rely on that complex ULA/floating bus behaviour, and any FPGA-based ...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…
... grey" models do implement the floating bus behaviour, and the only 128K ...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…
... grey" models do implement the floating bus behaviour, and the only 128K ... 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:…
... , the Z80 will read "FF" (floating bus), which is the opcode of ...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 ... , that becomes visible through the bus-divider resistors.
My ...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 ... , that becomes visible through the bus-divider resistors.
My ...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…
... ]
This one adds floating bus support:
[url]http ...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…
[QUOTE=ingo;389597]Which special bug do you mean?[/QUOTE]
Reading from 0x7ffd writes the floating bus value to the port, normally resulting in a crash: e.g.
PRINT IN 32765.
Crashes the 128 or grey +2.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…
... ]Reading from 0x7ffd writes the floating bus value to the port, normally ...which one bit of hardware would people want re-made?I'm just curious in the sense of I see interface 1's go for a fair bit on ebay and also multiface units etc.. so whats the one thing that you don't …
... 't. Also there's no floating bus on the Timex, and even ...
