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Spectrum items for saleI have many Spectrum items like Spectrum, Spectrum +, power adapters, Centronics Interface, Kempston Interface, Light Pen Interface(these are built b…
... , such as the ULA's, Z80 CPU, membranes and the memory chips ... it a little lighter, heavy power supplies could be left out ... /> Feel free to contact me on admin[at]schombi[dot]de ... -
Issues with 48k spectrum and divIDEI heard you can have all kinds of issues with 48k spectrum and certain DivIDE models. Is this true and if so what should I look out for ? Only aski…
... Spectrums end up having a Z80 CPU that has a malfunctioning /M1 ... connected while the power is on (there is a power rail on the adjacent ... inside the Spectrum, so a Z80 CPU that has a damaged /M1 ... /48k Spectrum may have a Z80 CPU with a malfunctioning /M1 output ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... ULA. But a Spectrum-on-a-Chip is definitely ... chips. No ULA or Z80 CPU needed. And yes if ... with a different CPU to interpret Z80 machine code.
on devices that record radio ... can configure it with registers, adder circuits and all ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... the Z80 CPU is not running. What the ULA is displaying on the ... data in the RAM after power up.
Add a ... ). Now when pressed, does anything on screen change?
What ... clock input pin to the Z80 CPU.
Mark -
Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…
... a couple of people on here who carry out ... and data buses between the Z80 CPU and the DRAM chips, ... , you are rather limited on what you can enter :(< ... the possible faults. With the power off, you can test ( ... pin with the same function on another chip. See the ... -
ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…
... or a conditional one based on both.
[/quote ... then I will try it on the real hardware, just ... 100% sure.
On your second reply, it's ... nothing to do with the z80 CPU per se, it doesn' ... split in two 8 bit registers or not.
... -
New version (v0.31) of ZX DiagnosticsHi all,<br><br>Just wanted to let people know that I've released a new version of the Spectrum Diagnostics into the wild.<br><br>These were originall…
... are available could be used on a PC. Or indeed ... similar applications on any suitable hardware.
If the Z80 CPU is ... .
If the Z80 CPU is okay, and the address ... and no receiving) using just CPU registers is possible.
[ ... -
New version (v0.31) of ZX DiagnosticsHi all,<br><br>Just wanted to let people know that I've released a new version of the Spectrum Diagnostics into the wild.<br><br>These were originall…
... are available could be used on a PC. Or indeed ... similar applications on any suitable hardware.
If the Z80 CPU is ... .
If the Z80 CPU is okay, and the address ... and no receiving) using just CPU registers is possible.
[ ... -
IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…
... Z80 does is based on being machine code compatible with 8080 CPU ... Z80 has an expanded / improved instruction set, as well as more registers ... and other improvements.
On the ... since continued to use this Z80 CPU feature :D
< ... -
Spectrom interface ?Hi all, I got 2 of this devices ... :) [img]http://forest.no-ip.org/wos/spectrom/20151006_151428.jpg[/img] [img]http://forest.no-ip.org/wos/sp…
Or there is a mechanism that uses the Z80 CPU along with that 8 pin chip (which could be a micro controller) which copies the data in the EPROM/EEPROM to RAM on reset or power-up...
[b][i]Mark[/i][/b] -
Spectrom interface ?Hi all, I got 2 of this devices ... :) [img]http://forest.no-ip.org/wos/spectrom/20151006_151428.jpg[/img] [img]http://forest.no-ip.org/wos/sp…
... a mechanism that uses the Z80 CPU along with that 8 pin ... EPROM/EEPROM to RAM on reset or power-up...
[b][i ... just a copy-routine that Z80 then performs. Hard to tell ... of PacMan that only ran on the +2A/+3? [/quote]
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…
... that ARM is doing the Z80 / ULA emulation along with creating ... ]C[/u]hip means ARM cpu + any number of included ... easy, and leave the cpu to focus on emulating the ZX. But ... a modern, pipelined cpu with 32 bit internal registers, (presumably) plenty of ...Were there other graphic modes for the ZX Spectrum?I've read that there was a "hi-color" mode that allowed the color clash to be 8x1 instead of 8x8. Maybe I have the name of that mode wrong. I'm…
... was build up by the Z80 CPU doing half the work with ... ULA helping. If the CPU was not allowed to build ... ULA. There are no programmable registers in the ULA for the ... is not a lot the Z80 CPU can do to change ... do want extra screen modes on a 16k/48k Spectrum, it ...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…
... /> If you want to run on 26-bit ARM hardware or ... even on slower 32-bit ARM, I ... ’m aware of plenty of Z80 CPU cores in hard-written x86 ... to try to conserve battery power on x86 laptops.I had a go.I haven't written anything in ZX Basic since the 80s, so I thought I'd have a go. Now just to put you in the picture, I am a developer and know sever…
... can find a single key on the keyboard).
on two serial ports from ... overrated, but the 386 power supply started to die, ... each day. Oh, and power blips don't affect ... buy brand new Z80 CPU's (and 6502 CPU's) is that ...Can anyone show a slight diagram of how pokes work in a jet set willy game for example?I know its kind of something to do with machine code and Memory addresses etc but would be nice to see a youtube video or some drawings etc ? .Many t…
... have way more memory and power on a basic mobile phone these ... some map or guide on the chips and registers etc?[/quote]
Z80 instruction set is described in ... development cycle for hand assembling on paper was difficult, but not ...RANDOMIZE USR, PRINT USR etcHello just wondering why is it called RANDOMIZE UsR what does randomising have to do with it ? When calling machine code routine from adress x you ty…
... Z80 CPU has a small amount of RAM memory. This is on ... BASIC knows nothing about the Z80 registers, but the USR function does ... />
In Z80 machine code, yes, the registers can be used ... . What the registers are used for depends on the instructions the ...Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... should float high. The Z80 CPU will read this as ... op-code 0xFF), the CPU will push the contents ... /> As the screen display on your machine is not affected ... pattern shown on screen different if you power down ... for 5 minutes and then power back on?
...Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... partly damaged ULA and / or Z80 is likely if an interface ... fitted or removed with the power on :-(
However, IC3 and ... the address bus between the Z80 CPU and the lower RAM, so ... the Z80.
Oh, what effect do you get on screen ...Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... logic analyzer to monitor the Z80 clock pin (pin 6 ... 5 MHz approx (depends on if the ULA thinks ... be normally high. The CPU will not work correctly ... C27 (1uF) provide a power on reset, and debounce the reset ... either is faulty, the Z80 CPU will not get a good ...endless runner project..So I'm thinking of writing a small tutorial series on writing games for the speccy in C, and figured that an endless runner would be an easy example …
... , the contents of Z80 registers at some point and ... to hold values in registers, depending on code complexity.
on the z80 is not about ... exact code that your CPU performs. In C ... recursive DEFFN functions somewhere on these forums.
...Joystick IssuesHi guys, I'm having a few issues getting joysticks to work well on my Spectrum 128k. I've got a Power Play Joystick interface and I've tried it with…
The Power Play Joystick Interface is a ... read by the Z80 CPU is whatever the value is on the data ... could just be dirty contacts on the Spectrum's edge-connector ... joystick should return these values on screen:
0 with no ...ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... is also possible that the Z80 or the ROM chip ... at least 30 seconds, then power on, check the border colour, ... s very likely that the Z80 CPU and the ROM chip ... . In most cases, the Z80 CPU and the ROM chip will ... a reset, then the Z80 CPU is at least trying to ...ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... the Z80 CPU.
If the speaker is okay, when you power on ... , after a few seconds, try pressing some keys on the ... Of course, this assumes the CPU can read the keyboard (a ... the Spectrum disconnected from the power, it may be worthwhile ...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…
... out the DC/DC inverter power circuit, which in turn killed ... of the RAM. Or the Z80 CPU could have died. Or there ... them yourself rather than going on my guess.
BTW ...48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... this part of the power supply circuit as a ... well while fault finding) power up again and retest ... available colours are listed on the number keys of ... chips back in. Then power up. If the Sinclair ... is powered on, this indicates that the Z80 CPU has at ...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…
... even if there is no Z80 CPU fitted)
[*]Provide the internal ... output) ports, that is the registers for the border colour, the ... very complex depending on the code that the CPU is executing. The ... indicate that there is activity on the address and data lines ...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…
... these supply rails are on three of the four ... inverter section of the on-board power supply section. Recheck ... Is this consistent at every power up? Try at least ... every time, then the Z80 CPU is either not able to ... can't find the topic on WoS).
...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…
... actually the official Sinclair internal power supply (inverter / DC/DC converter ... of it) can be present on any of the earlier boards ... repair work or servicing work on a Spectrum.
As ... /> It does look like the Z80 CPU is not running the code ...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…
... CPU itself.[/quote]
If it works straight away after a power on ... be okay.
The Z80 CPU actually has a special reset ... charge on the capacitor may not be discharged "cleanly". The Z80 ... may then see an erratic signal on it's ...
