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Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…
... Z80 CPU can address 65536 bytes (0-65535) using 16-bit registers, which ... or vectoring or anything going on that would let things appear ... bytes) are the 1-bit on/off pixel data for the ... -
Flicker fixer for ZX 48KHas anyone the schematics for the flicker fixer: [URL]http://8bit.yarek.pl/computer/zx.48/[/URL] Micky
... a piece of wire and power on. If it boots, then ... . Solder BASE to RFSH ( Z80, pin 28 ) and COLLECTOR ... to GND (Z80, pin 29). You can bend ... transistor body rests on the top of the CPU (in a ... [B]PICTURE 3[/B]
Z80 right side, showing the BC557 ... -
Help and Advice with DivIDE PlusHi Guys, Really struggling to get any reliable actiivty with my DivIDE Plus and am looking for some pointers. I am trying to get it to work with on…
... fix was to replace the Z80 CPU (most likely due to ... you have faulty Z80 M1 line, probably on both your spectrums ... able to replace my Z80 CPU and now it works ... of 4 spare modern Z80 chips which I could ... edge connector and switch power on to the computer then ... -
The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …
... topic but continuing the discussion on oldskool dev kits and systems ... 68K has sixteen 32 bit registers. You will have to get ... 256 pixels).
Limitations on VRAM access are impossed during ... a faster version of the Z80 CPU used in the Spectrum just ... -
I hit an electronic jackpot!!!Hi everyone, My computer project can exceed faster than ever!! My school has no electronic or computer teachers so they have thousands of chips and …
... I even got two z80 CPU's that i would ... I have loads of buffers, registers and flipflops!!!
All ... like minimum hardware for the z80 to function?
... /> for an absolute minimal z80 based computer you need a ... signals are being put on the bus (with DRAM ... -
divide deviceHi, This is first my first post,so hello to you all I first Spectrum 48k was a Xmas present way back in 1983,best gift ever. Then I moved on to a C…
... card adapter, and no extra power source is required. It comes ... don't work with it. On top of that, if you ... edge connector or faulty M1 on Z80 CPU.
Unfortunately it seesm to ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... my Z80's put all registers to $FF at power on. What ... registers to 0. But the RESET line is *not* invoked on power ... reset button while I power on the machine, hold the ... can only assume the Z80 must already be running ... a subset of the registers and doesn't touch ... -
List of existing games that needs a port to zx spectrumPlease post here the games that exist in other platform(s) but does not exist in speccy. Please keep in mind this is not a to-do list, so don't hesti…
... not bitmapped but based on tiles with scroll registers. The resolution is ... better hardware like a faster Z80 CPU, more RAM, better sound chip ... -
I might try building a barebones PC.Our Packard Bell iMedia 5077 is literally on its last legs. Every time it is switched on something doesn't work, usually it is the sound, sometimes i…
... t really like fitting the CPU, I was convinced I ... a Z80 or similar, ratherthan just resting it on top ... truth, power on time, American Megatrends came up, it displayed the CPU, ... tell. It's been on most of the day and ... the moment I'm on my rejuvenated laptop. -
Spectrum 8bit IDE adaptersHello there my fellow WoS'ers Today I am pleased to (finally) release these little adapters into the wilde [URL="http://postimage.org/image/1aceto6…
... should mention that not all Z80 CPU's are created equally. different ... allowing for another IDE device on the chain.[/INDENT]
< ... with any tests on either the ST branded Z80's nor ... =) )[/INDENT][/indent]
[B]Power Source[/B]
[INDENT][B ... -
Pac-Man EmulatorMy Pac-Man Emulator for the Spectrum +2A/+3 is now available for download from: [url]http://simonowen.com/spectrum/pacemuzx/[/url] You'll need to su…
... sound peeks the memory-mapped registers and converts them to the ... /> On the other hand, I don't (need to) emulate the Z80 CPU ... emulates all the hardware, including CPU. -
Pac-Man EmulatorMy Pac-Man Emulator for the Spectrum +2A/+3 is now available for download from: [url]http://simonowen.com/spectrum/pacemuzx/[/url] You'll need to su…
... sound peeks the memory-mapped registers and converts them to the ... /> On the other hand, I don't (need to) emulate the Z80 CPU ... emulates all the hardware, including CPU.[/QUOTE]
That's ... -
A misbehaving DivIDE 57c (Now repaired)Hello there my fellow WoS'ers Indeed it has been a while since my last post, please let me wish you all a (belated) Happy New Year, my this year bri…
... these units have a new Z80 CPU with Good M1 and NMI ... IDE to CF adapter (external power plug-pack)
[/indent]< ... attached IDE devices - on every boot, installed on every machine in ... works perfectly - continuity is asserted on button press.
... -
Snapshots (SNA) -> Keeping the loading screen?I've seen quite a few Snapshots (SNA) that kind of hesitate on the loading screen prior to entering the game menu... I quite like this. Anyone know …
... why is Z80 the only snapshot format listed on WOS entries and ... of ram and cpu registers. it's easy to work on. The only ... easily workable, not complex like z80 or szx.
Otherthan ... -
No video in Spectrum 128k +2A Grey[B][COLOR="red"]EDIT: 26-05-2012 = Thread topic edited[/COLOR][/B] Hi everyone, Recently i won a Spectrum 128k +2A Grey at ebay UK. The Spectrum …
[QUOTE=guesser;631642]I suspect a RAM fault.
What happens if you power on while holding the break key?[/QUOTE]
I already try that.
Nothing, full black screen.
The ram are the 2 chips near the Z80 CPU ? -
Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
... colt (first minutes from power-on) then after power-on or reset is ZX ... in messenger rom backup all registers and wait for midi communication ... #50 will ZX rom)
;cpu continue at adress #50 with ... #52 will ZX rom)
;cpu continue at adress #52 with ... -
ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…
... there is a poor contact on either the Spectrum RGB connector ... , or the SCART connector on the TV (dirty or tarnished ... the internal power supply section is faulty, or the Z80 CPU is faulty ... get it going, someone else on here may well be able ... -
ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…
... connector, or the SCART connector on the TV (dirty or tarnished ... the internal power supply section is faulty, or the Z80 CPU is faulty ... presume is better anyway. Based on this... possibly only 1 fault ... cash on this poor Speccy, so far got a new power supply ... -
SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... , as it means that no Z80 emulation out there is actually ... make me believe that the Z80 CPU has an internal register, which ... (or in case of NEC CPU's set to some partially ... depends only on the state of the known flags and registers.
Just a curiosity of mixing synth with samplesThis is really a proof of concept, I made for the idea of playing simultaneously two ZX Spectrum computers, where one is playing chiptune music and t…
... compositions are also different than on Spectrum. :)
But my ... -track required probably almost all CPU's power.
Although I've ... require a Spectrum with 7Mhz Z80? I don't know.
on ZX, since 90s.
...Just a curiosity of mixing synth with samplesThis is really a proof of concept, I made for the idea of playing simultaneously two ZX Spectrum computers, where one is playing chiptune music and t…
... Next step is do that on just one Spectrum as close ... it wouldn't work even on Spectrum with two AYs ... track required probably almost all CPU's power.
Although I ... require a Spectrum with 7Mhz Z80? I don't know. ... of sync. The code on the Spectrums has to ...Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …
... to white almost immediately after power up/reset, before accessing any ... oscilloscope that the /RESET signal on the Z80 CPU on pin goes from +5V ... U] from the [U][B]power supply[/B][/U] [I]and ... allow the Z80 CPU and the ULA to operate separately). On the meter ...Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... help to either clear the Z80, RAM and the address, ... hopefully give you more information on the fault.
power down, remove the RAM ... chips and use a meter on resistance (a low range) ... (A0 to A15) at the Z80 CPU.
See also ...The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…
... from the Mhz of the CPU. That shows how little I ... load as a 2MHz Z80. The specifics depend on the job in ... scrolling work on the C64? - does it take as little CPU power to ... 's a character-based screen on most games that's not ...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…
... Replacing the Z80 CMOS CPU to the original NEC CPU solved the ... and black and white stripes on screen with some color ... CLK pin of the Z80 CPU with the different CPU types. The clock ... and functioned perfectly. After initialization if I have removed the ...Grey Spectrum 128+2 Is mine dead??Having a nice session of 128+2 playing this evening and as I was playing Paperboy I noticed a few graphical glitches that had not occured before, the…
... is the border when you power it up? Does it start ... this are the ROM, the Z80 CPU, the ULA and the custom ... deck and with the computer on a hard surface, press each ...My new Spectrum +3 has no start menu.Hi all, I recently took delivery of my 'new' Spectrum +3 from a Fleebay auction. So I serviced the drive on Saturday as it had a snapped drive belt …
... will program the page registers back to the power on state, then will ... reset signal, which reaches the Z80 but not the gate array ... properly resetted and hence, page registers are not initialized to 0 ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
So the Z80 CPU and ROM work sometimes ... important clue. When you power up a Spectrum 48k, ... set to white, the CPU is either not working, ... spectrum is preventing the CPU, ROM and ULA communicating ... inside? Try pressing firmly down on any socketed chips.
...Edge Connector InformationHi Everyone, Hope I'm posting in the correct forum. I've recently been playing with an Arduino and got to thinking it would be fab if I could do so…
... /> The Z80 CPU is constantly producing an address (16 bit bus) on the ... Z80 CPU is doing. Then if the CPU is writing a data byte on ... will do.
The Z80 CPU control lines are active low ... until either the power goes off, or the CPU writes a different ...Issue 4S differencesI decided to buy an Issue 4S PCB after reading much about them on here. It was originally in a plus case which didn't come in the sale. I've been run…
... d update my comments on the Issue 4S, ... on the faulty Z80 chip:
Z8400APS
Z80A CPU ... chip, logo and so on, is identical to ... except to say that power consumption (and therefore supply ... Z80 had different power consumption from the new one. The CPU ...
