-
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... probe on the heat sink, power it up and touch each ... to a part of the circuit that is 0V (also known ... crash). But short between a power supply or 0V/ground pin ... -
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 …
... at power up. With the logic resources connected as desired, the circuit ... -
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 …
... determined is useful. Getting your circuit onto a ULA is a ... to the top of the circuit. This is what Sinclair did ... on the chip. Getting your circuit onto an FPGA is a ... . There are performance, size and power advantages to having full control ... -
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 …
... a collection of laid out circuit elements so you don't ... that the top and bottom power supply lines align, then you ... hold times are violated), and power (active areas generate more heat ... -
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 …
... where they had designed the circuit layout by hand. On the ... halfway up, there was a power socket that they needed to ... original 6502 die, where that power socket was in their wall ... -
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 …
... where they had designed the circuit layout by hand. On the ... halfway up, there was a power socket that they needed to ... original 6502 die, where that power socket was in their wall ... -
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 …
... where they had designed the circuit layout by hand. On the ... halfway up, there was a power socket that they needed to ... original 6502 die, where that power socket was in their wall ... -
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 …
... is no one 'true' adder circuit and none are merely pretending ... of them is an adder circuit and produce identical results given ... Wednesday I might make adder circuit version 2. I might choose ... better in some way (less power, smaller,whatever) if the designers ... -
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 …
... single IC package. The circuit functions are the same.
circuit would still be considered the ... same circuit.
The different ... differences in terms of speed, power, size and so on. ... -
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 …
... . I would classify any circuit transformed by rotation, reflection ... some portion of the circuit as spawning an emulation ... once into the FPGA at power up *before* the system ... physically removed without affecting the circuit. Firmware is used while ... -
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 …
... once into the FPGA at power up *before* the system ... physically removed without affecting the circuit. Firmware is used while the ... have a reconfigurable section of circuit that could be switched ... software control. The kempston circuit would only be built when ... -
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 …
... longer a Spectrum? What about replacing memory for a modern equivalent ... it runs under and the power of the machine it runs ... -
Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... the +12V or the -5V power lines. However, these voltages should ... Spectrums on-board voltage inverter circuit is working correctly. Although Zorn ... -
Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... the +12V or the -5V power lines. However, these voltages should ... Spectrums on-board voltage inverter circuit is working correctly. Although Zorn ... -
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 …
... would model it with lumped circuit elements. This is something ... quantities well enough if your circuit model is good enough. ...
Even a simple lumped circuit model consisting of a resistor ... conductors that carry power from far away power plants to local ... -
Martijn, come back! :DWe are even rzx.ing and youtube.ing your own games!! [url]https://www.youtube.com/watch?v=jfpItQsV6f4[/url] Well, its actually Albert and Daren, bu…
... the product of the short-circuit between the traditional hierarchical and ... want to get too much power for themselves unavoidably spark conflicts ... -
AVR ZX Spectrum V2_0Good time! Glad to present my new development - AVR ZX Spectrum V2_0. Sorry, have no english version of this video. [url]http://www.youtube.com/watch…
... /> I understand this is a circuit board that emulates standard Spectrum ... will also need a 5V power supply, PS/2 (Mini-DIN ... -
+2 external tape input. Best method?I've seen various ways of connecting an external tape input to a +2, like soldering the wires directly to where the tape head connects to the tape bo…
... to the tape deck amplifier circuit.
The series resistor ... pick up mains "hum" (50Hz), power supply "hum" (100Hz, 15kHz to ... -
What is the Sinclair ZX Spectrum Vega and what does it mean?Just stumbled upon this Indiegogo page following a tweet from SpeccyNews [url]https://www.indiegogo.com/projects/sinclair-zx-spectrum-vega[/url] it…
... by essentially mobile chipsets replacing bulky, loud and power hungry desktops in ... -
+2 external tape input. Best method?I've seen various ways of connecting an external tape input to a +2, like soldering the wires directly to where the tape head connects to the tape bo…
... to the tape deck amplifier circuit.
The series resistor ... pick up mains "hum" (50Hz), power supply "hum" (100Hz, 15kHz to ... -
128K Spectrum - can't figure out what's wrongLong time no post :) So I have this 128K Spectrum (+2 ROMs) that I cannot for the life of me figure out where the problem lies. Let's take a look a…
... model in itself, but the circuit is based on* the toastrack ... stable for hours (until I power-cycled), not showing snow, ROM ... correct though.
* The circuit is designed to have built ... -
RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…
... -5V-DC-oost-Step-up-Power-Supply-Module-UK-/281448404449?pt ... anyway. That and split the circuit so that the two 12v ... -
Switched voltage regulatorIn the past a replacement voor the (hot!) 7805 has popped up a couple of times in various threads. As far as I know, Recom Power Inc. was always ment…
... current!), but the TR4/TR5 circuit stops oscillating for voltages higher ... an additional diode in the power line. This will reduce the ... -
Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…
...
The schematic for the power conversion circuitry for the toastrack ... appropriate capacitors relating to this circuit
3) Checking continuity ... the other components in the circuit such as resistors, diodes ... on the 48K, the circuit in a 128K toastrack is ... -
RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…
... ~0.8v.
By replacing the 1k resistor (R44) with ... though which only happen in circuit simulators, not real life ;)
Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…
... /> What capacitors relate to this circuit and where on the board ... compared to what it's replacing.
As far as ... a low resistance reading - open circuit indicates a winding has failed ... - you're looking for open circuit (0L) reading here. A low ...Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…
... the transistors in this little circuit actually work - my understanding ... is a fairly complicated little circuit, combining a boost converter with ... like a simple DC transistor circuit because as you can ... the 9v supply from the power supply, and the output is ...RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…
... that solder point near the power connector and a wire a ... from the mainboard) instead of replacing r44 would this work?
RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…
... that solder point near the power connector and a wire a ... from the mainboard) instead of replacing r44 would this work?[/QUOTE ... across the board to the power socket though, you can get ...Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…
... are quite prone to internal power supply failure (the RAM chips ... and TR5 in this conversion circuit that might be faulty - you ...
