-
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 ... -
+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 ... -
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 ... precise) without a standard ZX-bus.
Hm ... -
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 …
... , and then repeatedly read the floating bus until that value is detected ... work on 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 ... -
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…
... . Previous trick are using the floating bus (not compatible with all Spectrum ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... every PC vblank)
[*]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…
... relies on accurate contended memory/floating bus emulation will certainly flash, jerk ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... with contended memory and the floating bus, I'll add TZX support ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... . still no accurate contended memory/floating bus emulation.)
This way ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... following release. Real contended memory, floating bus and machine-code implementation is ... -
Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…
Quicker and easier would be to try reading from the AY [i]data[/i] port. Floating bus => 128K, same as AY [i]register[/i] port => +2A/+3. Might make debugging on some emulators harder though. -
IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…
... DivIDE places data on the floating bus. This will kill this idea ... -
Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... more interfaces then value of floating bus can be unstable !!!
floating bus. But all modern interfaces (and ... -
Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... interface isn't connected, the floating bus will normally give
(IN ... -
Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... interface isn't connected, the floating bus will normally give
(IN ... -
Cant DecideI have had a lot of spectrums in my time from the 16k to the +3 and as we all know they all have flaws. I am thinking about buying another and wanted…
... you're referring to the floating bus. That's a bug in ... -
Cant DecideI have had a lot of spectrums in my time from the 16k to the +3 and as we all know they all have flaws. I am thinking about buying another and wanted…
... you're referring to the floating bus. That's a bug in ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... code, then I incorporated the floating bus logic from Fuse, also as ...
