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DIVIDE PLUS - ZX bus protectorI make new ZX BUS PROTECTOR for use with DIVIDE PLUS interface. This is very small "convertor" for connection to new ZX BUS connector. PCB contain on…
... for connection to new ZX BUS connector. PCB contain only some ... possible connect to new ZX BUS any interface (interface 1, multiface ... external memory)
- ROMCS and both ROMOE signals on ZX ... />
- [B]very easy design and small PCB[/B]
Hustler (Bubble Bus)According to an article in Pop.Com.Weekly (21.Jun.84, front page) Hustler was re-released in the UK as Minnesota Fats' Pool Challenge (although proba…
... are expected soon"). Apparently Bubble Bus licensed HesWare to sell the ... , who renamed it as above, and then Thorn-EMI got the ... slightly unusual situation, as Bubble Bus were still selling the game ...Expansion bus questionsHi, two questions about expansion bus, sorry if they have been replied before, I tried to find replies but all my keywords lead to tons of threads O…
...
two questions about expansion bus, sorry if they have been ... 1) Is there any zx bus splitter hardware design avaliable? Any ... that plugs into the zx bus, and provides several connectors (same than ... more modern connector (like and IDE connection if it has ...Speccy's and Opus etcAre you sitting comfortably? I will do my very best to identify all this stuff. I have had some help but please ask if you need more information abo…
... .jpg[/img]
And, there is another outer sleeve ... IMG]
And a Genius GM7 Bus Mouse complete with its ... box and foam insert.< ... CUB Monitor. Black metal cased and complete with original user manual ...Floating Point Forth (CP Software)[IMG]http://i269.photobucket.com/albums/jj79/Hairyrecords/scan0011.jpg[/IMG] I don't see Floating Point Forth by CP Software in the archive. But I …
... />
I don't see Floating Point Forth by CP Software ... the author, and later published by CP Software as Floating Point Forth ...4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... time experimenting with different circuits and components for using a static ... with an Issue 2 Spectrum and different ULAs. It works ... on differences between the 5C112E and later ULAs that may affect ... be a difference in the timing of the presentation of the ...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…
When developing and testing [URL="http:// ... different results on Fuse and SpecEmu. Unfortunately I don ... 0.1 (Windows build) and SpecEmu 3.0 build ... are emulating a "late timing" machine then delete line ... ignore this test above and use instead the version ...Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…
... emulator for the V6Z80p board, and we have found something odd ... does port accesses creating IR contention (as, if we are right ... effect during the title screen and during the game play (i ... the snow effect option enabled) and I get the same results ...BIT b,(ii+n) contentionThe documentation says that BIT b,(ii+n) has this contention pattern: pc+1:4,pc+2:3,pc+3:3,pc+3:1 x 2,ii+n:3,ii+n:1 See [url]http://scratchpad.wiki…
... b,(ii+n) has this contention pattern:
pc+ ... .wikia.com/wiki/Contended_memory[/url] and
[url]http://www ... the instruction is two bytes and the ufficial z80 manual says ... Tstate.
So the contention pattern should be:
Zero 0.5 ReleasedAfter a bit of a hiatus, the next update of Zero is now available [URL="www.ramtop.wordpress.com"]here[/URL]. Feedback and bug-reports appreciated! …
... ].
Feedback and bug-reports appreciated!
< ... (Woody).
- Fixed IN contention (Woody).
- Fixed ULA ... accurate core and renderer (Woody).
- Fixed timing for EX ... Obo)
- Fixed ULA Plus timing and colours (Andrew Owen)
- ...Microcontrollers and the SpectrumBeing unusually busy lately, I didn?t get a chance to comment at the time on a remark in an older thread, but I shall take the liberty of doing it no…
... directly connect to the Spectrum bus, and you'll need some interfacing ... /> Now, this is the truth and nothing but the truth, but ... some other system?s data bus.
So there is no ... -in ports, multiple hardware timers and a complex interrupt logic, but ...Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…
... 1 bis[/URL] thread, and it appears that there ... br /> It appears that myself and others are not fully aware ... know level, or are some floating?
[*]Which data ... [*]Do they all use bus mice with a 9 pin ... of Atari ST, Amiga and BBC Micro bus mice)?
[*]Do ...ZX Spectrum and Interface 1 microdrive connectorsI think the following is correct: IF1 microdrive connectors are 8pin (slot 3 notched) 2.54mm pitch and Speccy Expansion Bus is 28 pin (position …
... pitch
and
Speccy Expansion Bus is 28 pin ... the two online (Maplin, Farnell and RS).
Where do you ... IF1 + microdrive heading my way, and I don't know if ... to hook up the drive, and 7 quid for a connector ...SPECTRA - RGB SCART Interface for 48K SpectrumSince the launch of the SPECTRA interface back in June 2012, some discussion of it has appeared in the forums in the past (mainly [URL="http://www.wo…
... signals available on the expansion bus. This allows the Spectrum ... full width gold plated expansion bus.
[*] A set of ... compatibility with all existing hardware and software.[/LIST]
... ) [8x1 DE mode] | Mass: Floating City (John Harris) [8x1 DE ...New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…
... what causes this problem and see whether a simple ...
With the new CPU and Spectranet connected, the Spectrum usually ... always begin to initialise and sometimes complete the DHCP ... the data bus slightly more quickly and before the bus has stabilised ...MGT Two-Face and DivIDEI've got a [url=http://www.worldofspectrum.org/infoseekid.cgi?id=1000247]MGT Two-Face[/url] that I used to connect to my Spectrum 48K and then a DivI…
... was unable to erase and reprogram it, so I ... I have disassembled it and found it contains three ... 74LS type chips and the rest just looks ... trouble trying to remove, test and replace them?
bus through that is certified ...Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…
... DivIDE interface emulate this device and enable use software from ... then external memory are connect and CPU read instruction from ... /> BETA128 contain throught ZX bus for possibility connect next external ... br /> bit 3 = Head load timing
bit 4 = select ...Connectors for ZX BUSHere is photos of three different versions of connectors used on ZX interfaces: As you can see, each connector use different shape of contacts. Firs…
... version have big contact area and better stability of connector. Also ... /> Thickness of ZX board (system bus connector) is about 1.5 ...ZX Spectrum +2A and +2B - finding the true factsI'm confused. Some told me that a +2A has a +3 board, and the +2B got the simplified board. But I think that is not true. I have had over a dozen b…
... />
I started Googling, and found this:
[url]http ... omitting the floppy controller circuitry, and of course the disc drive ... would have needed an expansion bus interface with a floppy ...
So officially the +2A and +2B boards are already the ...Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... an experiment. I understand switches and logic, but my knowledge ... not full address decoding, and that technically it should check ... data on the address bus connections is floating (unconnected), but when ... use to achieve this, and how should they be connected ...Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... s placed on the address bus during execution of HALT, ... ] the interrupt is acknowledged, and that the fetches that are ... an interrupt during a HALT and any other interrupt.
... [/CODE]
For NMI and maskable interrupt acknowledgement, it contains ...New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…
... with real timing for all the models and with hi ...
Contended memory and real timing for Spectrum, ZX80, ZX81 ... (rainbow) for Spectrum and ZX80/81 (non standard ... and 48 KB to ZX80/81
Added idle bus ... port emulation
Added option to load and ...Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... /> - debugger with sw and possible hw /nmi/ breakpoints ... a grand cycle timing scheme (and it is not!)< ... /> uploop:
0x11E2 AND A ; possibly clear carry ... replace code between 0x11D4 and 0x11EF and make
sure ... code B=0 and HL=0xffff. And make sure that ...Issue 3 expansion connector problemI am having problems with an issue 3 Spectrum, that otherwise works fine, but does not recognize either the Interface 1 or DivMMC/Enjoy (which are bo…
... /> The connector is clean and shiny, and I did not find any ... that no connector pins are floating expect the unused ones. I ... , the +5 is OK and clean and the Spectrum otherwise works fine ... otherwise works, there are no bus shorts. Anybody have an idea ...Photos from the Cambridge Centre for Computing History and from the Baron of Beef pubFor several weeks, I've been adding new photos every Sunday to my Flickr space because I am publishing a selection of pictures from my trip to London…
... my trip to London and around - Windsor, Winchester and Cambridge namely - I ... a couple of shots, exterior and interior, of the Baron of ... good ale before taking the bus back to London.
and English.
Feedback is ...Zero 0.7 / Zero 0.6.5 releasedAfter months of grueling work, I?m proud to announce the Vanilla version of Zero, which is a regular Windows version of the emulator. I?ve tried to m…
... /> + Implemented correct cold boot and reset emulation.
+ Updated ... FrankT).
? Fixed a contention timing issue with IN.
? ... 128K and above machines (doh!).
? Fixed machine timing ... when switching between Pentagon and some other machine ( ...ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…
... ]Baseconf[/url] -- raster and ULA contended memory emulation for ...
5. Yet no +3 timing emulation, though some provisions are ... corner just below time and date) AND 3.5MHz CPU frequency ... insight into contended memory topic and useful discussions.
New version emulator ZEsarUX-2.0Hi I have uploaded a new version of my ZX80/81/Spectrum/Z88 emulator on [url]http://sourceforge.net/projects/zesarux/[/url] Changes are: Added Ca…
... ZX81
Added interlace and scanlines mode
Added ... bus port value on +2A machines and memory paging enabled
Fixed timing ... Fixed cpu initializing registers and magic RANDOMIZE USR 46578. ... /> Some other minor bugfixes and improvements
...
