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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…
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[list]
[*] Issue 2 48K machines and Issue 3 ... famous of which is the "floating bus", which is what causes Arkanoid ... -
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…
... electron beam.
Tip 2: Make sure the electron beam ... . Previous trick are using the floating bus (not compatible with all Spectrum ... -
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…
... know that the 128K and +2 will snow when this happens ... 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 !!!
* bits 3-2 (up/down) will never both ... 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…
... a DI (243).
2. There's an issue with ... 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…
... the same.
[QUOTE]2. There's an issue with ... down considerably. Zxs will have 2 Z80 cores, one with disassembly ... you need to emulate the floating bus to prevent a number of ... -up resistors on the data bus causes it to float high ... -
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 ... to get a grey +2. The +2 is without a doubt the ... ...
48k or Grey +2. Make sure you get a ... -
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…
... 't run because of the floating bus and that can be bodged ... .
[QUOTE=Arda;495219]Black +2 models are dirty hack by ... +2. (that's why it breaks games, cause if *fixes* 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…
... +2. (that's why it breaks games, cause if *fixes* the floating bus ... read from the video data bus, by means of three-state ... auxiliary (full-speed) RAM
2. (compromise; good enough) connect one ... -
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…
... 48+ with the divIDE+.
2) Get a real divIDE and ... ) the +2B sound mod, the floating bus mod, the joystick port mod ... , and the expansion bus mod.
You'll ... -
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…
... with the divIDE+.
2) Get a real divIDE ... +2B sound mod, the floating bus mod, the joystick port ... mod, and the expansion bus mod.
... DivIDE+ (possibly because the floating bus mod has been done) ... What's the expansion bus mod? Also, are there ... -
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
... of problematic games on ZX128/+2(grey) ?[/quote]
There ... lot of issues with the +2, but unless I've misread ... with games that read the floating bus, and hardware that requires ROMCS ... on the expansion bus. Using a pair of Spectrum ... -
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
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Snow effect on ZX128/+2 can be fixed if you ... (ZX ignore reading and return floating bus). Ports acceleration can be also ... new GAL16V8 for fix ZX128/+2 memory layout (as on +2A ... demos and multicolors for ZX128/+2 will work incorrect. -
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 also ... and multicolors for ZX128/+2 will work incorrect.[/QUOTE]< ... HAL10H8 in your ZX128/+2(grey)
2) solder socket for ... />
compatibility:
ZX128/+2 with this GAL chip is ... -
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…
... br /> High port contention 2? skipped (B=0x01)[/code]< ... passed
High port contention 2? passed[/code]
High port contention 2? passed[/code]
Floating bus? failed (0x00)
Contended ... -
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…
... , the best Speccy was the +2. Bugs fixed, decent keyboard (the ... compatibility bugs, such as the floating bus, which Amstrad naively "fixed" for ... -
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…
[QUOTE=csmith;547592]2. How does fusetest differentiate between ... the +3 (and that the floating bus value is read on the ... -
general beginner queriesHi, I bought myself recently a +3 and a devide extension. I was not in touch before with the speccy, but I am really surprised and delighted about th…
... is that it fix the "floating bus"-issue which can crash some ... MOUSE compatibility with wheel PS/2 mouse support
- A-MOUSE ... )
- fix stability of data bus with IM2 vector
- enable ... -
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…
... of your +3 by putting 2 copies of the spectrum SE ... and soldering a wire for floating bus support so that games like ... -
Emulation of ZX Spectrum 128+2 (grey)Please read this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=35523[/url] result: exist 3 (or more) versions of grey ZX Spect…
... Reading from 0x7ffd returns the floating bus value, so with some ... on ZX128 and grey +2 models write to paging ... and some old grey +2 models write to paging ... (set ram 7,videoram 2, 48rom, disable 128kB paging ...
Last version of +2 ignore reading from port 7FFD ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... a program which uses IM 2 to run an interrupt handler ... go as well. What about floating bus? Is that known to work ... ?[/QUOTE]
FLoating bus cannot work as there's ... -
Spectrum +3, Issue 2...I have just had plonked on my desk a nice issue 2 Spectrum +3. I'm not sure if its 100% working yet, as I have not plumbed it into a telly. So, assu…
... my desk a nice issue 2 Spectrum +3. I'm ... says it's an issue 2. Does this need the AY ... fine, is this the issue 2 +3?[/QUOTE]
Both ... Issue 1 an Issue 2 motherboards have the design flaw ... the games that need the floating bus on your +3 then yes ... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... on a 48K, Toastrack or +2 Grey the ULA snow will ... behaviour, EVEN when secaria's floating bus fix is implemented (a resistor ... board). The toastrack and grey +2 get even more confused and ... -
Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
...
Contented IN... passed
Floating bus... skipped (B=0x01)
Contended ... ... passed
High port contention 2... passed
0x3ffd read... skipped ... -
Kralizec, a MSX development group, publishes "MajiKazo" for ZX Spectrum[youtube]wJI30FyT7Qw[/youtube] It's a port from a MSX game called [URL="http://www.generation-msx.nl/msxdb/softwareinfo/3449"]MajiKazo[/URL] release…
... difference between Side 1 and 2?[/QUOTE]
... Lemonize, which uses the floating bus effect to synchronize with the ... work on 48, 128 and +2 (grey) machines.
bus effect, I took into ... version is put on side 2.
So ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... delay routine. Cobra uses the floating bus reads but it can also ... at that time.
2. Once the ray is past ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... delay routine. Cobra uses the floating bus reads but it can also ... at that time.
2. Once the ray is past ... my current understanding of the floating bus :-D
[IMG]http ... .photobucket.com/albums/n608/daveyboyhughes/bus-1.jpg[/IMG] -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... anyway, don't use the floating bus - use a loop to delay ... screen is done.
(2) Add a few bytes to ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... /> Contended IN... failed (0x7f)
Floating bus... failed (0x38)
Contended memory ... (0x7f)
High port contention 2... failed(0x7f)
0xbffd read ... -
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…
... (OUT) to 0x7ffd with the floating bus value is correct behaviour. However ... also the early model grey +2. But possibly not the late ... model grey +2, which has a different HAL ...
