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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 ... implement it are the +2A/+3 (except my +3 of course :D ) -
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 ... it are the +2A/+3 (except my +3 of course :D )[/QUOTE ... if it's actually a floating bus issue or other pesky incompatibility ... -
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 ... = SE1
2 = SE0
3 = SE1
The SE ... -
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…
... 2 48K machines and Issue 3 48K machines handled the keyboard ... +3 are significant, the most famous of which is the "floating bus", which ... to not work on the +3. -
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 ... .
Edit:
Tip 3: Don't copy the whole ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... compromise between a real 4:3 Speccy screen and the native ... . still no accurate contended memory/floating bus emulation.)
This way ... -
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 ... works on the +2a or +3, and i didnt dig too ... -
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 !!!
* bits 3-2 (up/down) will never ... on bits 5-7 is floating bus. But all modern interfaces (and ... -
zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…
... 't look right.
3. Reading from any non-existing ... you need to emulate the floating bus to prevent a number of ... -
zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…
... be finalised.
[QUOTE]3. Reading from any non-existing ... you need to emulate the floating bus to prevent a number of ... -up resistors on the data bus causes it to float high ... -
Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…
Trust me not as I'm not that techy, but I think the +2A and +3 can't use the floating bus trick to know if the ULA is drawing the border or not. That's what made many games such as Arkanoid not work with those models. -
Floating bus on 128K models[b]Background:[/b] i need run code with interrupt enabled but i need use stack instruction to maximize performance in copy/shift/mirror routines. dur…
na_th_an is entirely correct: the +2A/+3 do [i]not[/i] have the floating bus. -
What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…
... and the +2a is the floating bus, and more games than you ... the screen. With a +2a/+3, Amstrad fixed that "bug" and ... -
What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…
... uncompatible. Avoid.[/QUOTE]
The +3 isn't that incompatible, there ... . The biggest problem with the +3 is the awful AY output ... +2A is identical to the +3, and the +2B is mostly ... games, cause if *fixes* the floating bus, which is only there because ... -
What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…
... games, cause if *fixes* the floating bus, which is only there because ... fix for the +2a/b/+3?
[IMG]http://www ...
"To make any +3 compatible with all software that ... read from the video data bus, by means of three-state ... -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... have recently read that the floating bus fix means that a DivIDE ... better off starting with a +3 and "upgrading" the sound rather ... building a "back to the +3" board. -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... 48K Spectrum +, and a Spectrum +3.
I also have ... that my +3 has been modified to fix the floating bus bug (not ... -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... and install esxDOS
3) Get Guesser's Flash ROM ... the +2B sound mod, the floating bus mod, the joystick port mod ... commercial speccy software including the +3 disk versions. Technically the 128Ke ... and HiSoft BASIC +3), but since the +3 is the bastard child ... -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... +2B sound mod, the floating bus mod, the joystick port ... mod, and the expansion bus mod.
3 disk versions. Technically the ... 3 won't work with a DivIDE+ (possibly because the floating bus ... What's the expansion bus mod? Also, are ... -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... +3 won't work with a DivIDE+ (possibly because the floating bus mod ... deal with the +3 edge connector. The expansion bus mod restores the ... 128 instead of a multiface +3 for instance).
[ ... any definitive instructions for the +3 AY fix?[/quote]
... -
What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3
... obviously only tested on the +3 and suffer as a result ... +2A mode also (ram 0-3 is fast and ram 4 ... (ZX ignore reading and return floating bus). Ports acceleration can be also ... used as on ZX128+2A/+3 (A15=0,A14=1,A1 ... -
What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3
... ZX ignore reading and return floating bus). Ports acceleration can be ... for new replacement
3) connect on bottom side of ... (same as on ZX128+2A/+3)
- reading of port ... (same as on ZX128+2A/+3)
- new memory ... (same as on ZX128+2A/+3)
- I/O ... -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... my +3 to bits (yet again!) to see if the floating bus mod ... -
The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... my +3 to bits (yet again!) to see if the floating bus mod ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... 0x8000 + 0x94fc
Machine type: +3
BIT n,(IX ... /> Contended IN? failed (0x03)
Floating bus? failed (0x00)
Contended memory ... br /> CB (00-FF) 5+3 ROM : 4B39 failed, expected 4D19 ... br /> CB (00-FF) 5+3 RAM : 1986 failed, expected 1B66 ... -
So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…
... compatibility bugs, such as the floating bus, which Amstrad naively "fixed" for ... the later, far inferior +3 models.
The Timex ... -
128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... /> [code];; Distinguish between 128K and +3 by looking at the partial ... 0x7ffd"[/code]
[quote]3. What is fusetest "testing for ... (and doesn't on the +3). Well known bug in the ... port on the +3 (and that the floating bus value is read on ... -
Spectrum DIVIDE and Kempston Interface ProbsI got my DIVIDE quite a while back and was using it on a Spectrum +3, but noticed some games loading corrupt and not all games having proper joystick…
... improve the compatibility of your +3 by putting 2 copies of ... and soldering a wire for floating bus support so that games like ... -
NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…
... connector
+ through ZX bus connector
- kempston port ... with A5=0
+ 3 layers PCB
- S ... are unused = return part of floating bus value. PRINT IN 31 not ...
