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Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…
[quote="jgharston;840550"]Microdrive emulation in a RISC OS Spectrum ... for the Z80 emulation. I’m aware of plenty of Z80 CPU cores in ... -
7mhz CPU?One of the things I like about Spectaculator, is that I can zap the clock speed of the emulated CPU up. Doing so makes me wonder about why the desig…
... , you are effectively building a new machine.
The computers that ... (some are too slow), the Z80 CPU needs replacing and sometimes the ... -
Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…
... /> Have you run a memory tester from ROM?
I'm ... read about people changing the Z80 CPU to a CMOS version and ... -
Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... , to be precise. The ARM CPU has a 16KB code cache ... is a pipelined or superpipelined CPU anywhere in the tech docs ... fast a CPU should be to provide 100% accurate emulation of a ... architecture and the Z80 architecture and ran the Z80 core emulation so that ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... (R) Register.
The Z80 CPU contains a memory refresh counter ... br />
NOTE: All Z80 repeat instructions, like LDIR, LDDR ... increment correct, due to some Z80 quirk ?
Or
emulation, and hence this bug propagated ... -
Speccy/Sinclair TriviaI'd like to make a trivia game with Sinclair and speccy related trivia questions, but hey, that's a lot of work. And a lot of you guys know a lot mor…
... 1982, Sinclair Research moved to new headquarters in Willis Road, Cambridge ... />
The Spectrum's Zilog Z80 CPU runs at which speed?
Z80, but what does the X ... -
DYNAMITE DAN I vs DYNAMITE DAN II - WHICH IS THE BETTER GAME?Welcome to the September 2016 edition of Which Is Best? Last month I placed three Amiga top down racers, Nitro, Super Cars II and Overlander. Overl…
... without knowing a dot of Z80 I agreed. Oh and there ... . I was sent a shiny new CPC and a print out ... needed to know about the Z80 CPU. The principle I used was ... running on the Amstrad's CPU, then re-wrote his rendering ... -
Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…
... black screen. Then it writes new data to memory. On screen ... by the ULA (from the Z80 CPU).
Does this board ... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... 128 cycle refresh from the Z80 CPU. Even though they are 128 ... refreshed by the ULA. The Z80 is not able to do ... the refresh system in the Z80 CPU is defective. That would explain ... ? If yes, buy a new CMOS Z80 CPU and try again.
ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…
Oh, I should say that until a ROM based RAM tester has been used to clear the DRAM chips of guilt, we should keep an open mind, as strange ULA faults, strange Z80 CPU faults etc are also possible.Replacing z80Hi all, I've just finished removing my z80 and installing it back in in a socket. Surprisingly I haven't broken anything in the process and the sp…
... maximum recommended clock frequency. The CPU will actually run at the ... for a ZX Spectrum, any Z80 rated for 4MHz or greater ... I know, only Zilog produces new Z80 CPUs now. But in the ...The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …
... ’m talking specifically about the Z80, and the designations that I ... horse’s mouth (the [i]Z80 CPU User Manual[/i] by Zilog ... when he was designing new instructions for the Z80. (And who knows ...128K Toastrack (Noisy video output)Hello there guys! Need all of yours guides and advices. Some time ago I bought a nice looking 128K from eBay (motherboard v6K) and put it aside for…
... to replace the perfectly good Z80 cpu with one of another brand ... tape.
Ok. Now some new additional measuring points:
TEA2000 ...ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... is mapped into the whole Z80 CPU address range)...
If ... and take control of the Z80 CPU address, control and data busses ... micro-controller can receive a new "ROM" file from the ... This then would receive the new "ROM" code via the existing ...ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... cycle timing. Using the Z80 CPU's bus request pins (/BUSRQ ... ) and take control of the Z80 CPU address, control and data busses ... micro-controller can receive a new "ROM" file from the ... br />
Stopping the sacred Z80 sounds almost like a blasphemy ...ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... and take control of the Z80 CPU address, control and data ... micro-controller can receive a new "ROM" file from the ... you are loading a "new" ROM, this does not ... lower" RAM, then once the new "ROM" has been stored, ... 0000 to run the new ROM. The Sinclair ROM ...Spectrum repairs[edit - sorry! wrong section, if someone can move please] I'm in contact with a seller on Gumtree. He was selling a 48k Spectrum, fully boxed and…
... of the RAM. Or the Z80 CPU could have died. Or there ... posting a link to the new thread in a post in ...Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... One way to arrange the new system, is to provide ... RAM and the Z80 CPU bus (with the Z80, upper RAM ... new logic can fool the ULA into thinking the Z80 CPU ... some new "screen" RAM during the time that the Z80 CPU ... ULA only reads from this new RAM.
...Spectrum +2 grey ear mod?Is it possible to turn the sound port on the back of a grey Spectrum +2 into an ear input? I know it's possible for the black +2 but I can't find muc…
... ROM and RAM throughout the Z80 CPU address range.
However, the ... map must not respond to CPU instruction fetches, instead the RAM ... the RAM) must respond to CPU instruction fetches from the area ... that you can POKE a new value in to increase the ...Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…
... /> It does look like the Z80 CPU is not running the code ... the ROM. There is nothing new to suggest that the ULA ...ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... Have you tried a different Z80 CPU? The best method is to ... swap the Z80's between your two ... Dataserve Retro sells Zilog Z80 processors recovered from scrapped ... heard they're still made new... I'd assume that ... that can test the Z80 to see that it' ...48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... all, I'm relatively new to the Sinclair world, ... the video signal). The Z80 CPU is not processing instructions ... ), or either the CPU or ROM are defective ... changed them, fitted a new 7805, 100µF composite ... present before and after new caps installed and within ...48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... creates the video signal). The Z80 CPU is not processing instructions from ... the CPU or ROM are defective."
The Z80 is a new ... fine; I desoldered the original Z80 and tested it in the ... the ROM and Z80 and the ULA & Z80 once I find ...Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…
... , with changes made for the new video modes and for interfacing ... between the scld and the z80 cpu to recover floating bus behaviour ...Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…
... , with changes made for the new video modes and for interfacing ... between the scld and the z80 cpu to recover floating bus behaviour ... the data bus ULA and CPU.Faulty ZX Spectrum 48kHi guys, I just got around to doing a composite mod on an old ZX Spectrum 48k that I got from Ebay a while back. It did say it was untested and b…
... ... well, unless you want a new original working Sinclair ULA...
Z80 CPU is at least managing to ...If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... br />
Over time, new software will start to use ... As more software uses the new features, so programmers / producers ... adding new hardware features in new models, I think new hardware ... 8, but with a 6MHz Z80 CPU, with selectable operating speed: 3 ...Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…
... knowledge of electronics. If your new to soldering there's lots ... guess though being a faulty Z80 CPU.Please recommend me a MacBook for running ZEsarUX with SpecNext EmulationHi, coming "from DOS/Windows only" I´m into buying an used or new Apple MacBook. I think over buying an older one which has USB-A-Connectors, so a…
... runs sufficient fast under TBBLUE-Emulation (CPU Settings Turbo [8X 27,955 ... -50 FPS with 70-90% CPU-Usage).
But I ... 10 x64-PC with faster CPU (AMD Ryzen 7 2700X 16 ... equally when running NextOS at Z80 CPU Turbo 8X (28 MHz). Is ...Whats the smallest amount of time to precise emulate a Spectrum?Whats the smallest amount of time to completely emulate a Spectrum? Maybe the ULAs timings as mentioned here: [url="https://opencores.org/projects…
... cycle) of Z80 CPU. It needs for precise emulation of both Z80 and ZX ...
