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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…
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Myself, as well as test programs of various types. I ... buy brand new Z80 CPU's (and 6502 CPU's) is that ... -
Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…
... apart from the display corruption; CPU use of the lower RAM ... have not been able to test this as I have never ... -
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…
... (a T-state is a CPU clock cycle, about 290ns). 224 ... />
A quick and dirty test of such a program with ... -
Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…
... quality multimeter so I can test voltages. Alas no oscilloscope. I ... the logic chips near the CPU are also socketed. When I ... -
Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…
... or possibly a faulty CPU. Without further test equipment, it'll be ... -
Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
... proper values... How can I test if the coil has died ... the main logic, memory or CPU circuits. So don't worry ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... either the Z80 CPU is dead, the CPU has no clock signal ... good clock signal on the CPU (pin 6 from memory IIRC ... these are on the Z80 CPU pins.
If the ... normally socketed, so a swap (test both Spectrums) will let you ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... forward. We now know the CPU is trying to do something ... assume you either have a test ROM image or one of ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... , unplug the ULA and the CPU. Now using the resistance range ... +5V. Test using connections on the socket for the CPU. Record each ... -
damn 60 HzYou know I am really glad that ZX Spectrum is 50 Hz only. Not only the games always run in correct speed (unline Atari, Commodore, Sega, Nintendo...)…
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if you want to test the theory out about the ... to try to get some CPU time back vs, with the ... -
Fuller FDS keyboardHi folks, Bit of a head scratcher for me since I found one of these whilst looking for dead Speccy boards and there doesn't appear to be a whole l…
... ZX Spectrum computers, uses the CPU upper address lines (A8 to ... range on your multimeter to test the keyboard. Have a look ... -
spectrum 48k issue 3b coloured blocksI have pucked up a nice looking plus but when powered on get black or yellow border and random coloured blocks on screen, I have taken keyboard off a…
... the Z80 (if socketed) then TEST all the supply voltages, the ... /> It's rare for Z80 CPU's to fail on their ... -
Jet Set Willy: The Nightmare EditionExperience the timeless classic with a refreshing wave of new challenges and surprises! Solve the mysteries and find all the items... and be quick! …
I would test on a few more emulators ( ... emulator, being on a restricted CPU, is going for "good enough ... -
New version emulator ZEsarUX-4.0Hi I have uploaded a new version of my emulator ZEsarUX 4.0. You can download it from the project web page: http://sourceforge.net/projects/…
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Thanks for the test.
Yes, you can use ... values reduce latency but increases cpu usage.
Also I'm ... -
ZEsarUX emulator - ZX-Uno support & Windows compatibility<p style="margin: 0px; font-size: 12px; font-family: Helvetica;">Hi</p> <p style="margin: 0px; font-size: 12px; font-family: Helvetica; min-height: …
... 'll test this as well.
On windows, the CPU load ... -
ZEsarUX emulator - ZX-Uno support & Windows compatibility<p style="margin: 0px; font-size: 12px; font-family: Helvetica;">Hi</p> <p style="margin: 0px; font-size: 12px; font-family: Helvetica; min-height: …
... quality, but this uses less cpu power... Real audio disabled was ... because it's difficult to test.
About pulse audio... Well ... to program it.
To test another thing... Look if threads ... -
Harlequin Rev GI have just got all the bits to build an Harlequin Rev G system and I went for a red solder mask board. I have fitted the 3 surface mount components…
The picture of the Test ROM is indicating that it ... border, the ROM and the CPU must be working.
Try ... -
Harlequin Rev GI have just got all the bits to build an Harlequin Rev G system and I went for a red solder mask board. I have fitted the 3 surface mount components…
... ;855195"]The picture of the Test ROM is indicating that it ... border, the ROM and the CPU must be working.
Try ... -
TommyGun updatehttps://drive.google.com/file/d/0BwXFKYO5i1IlN2U4MUtrRVZZWUE/view?usp=sharing Hi, I have updated my TommyGun application and since we can't uplo…
... large percentage of memory and cpu toward software engineering concerns. It ... 're aware of in most test cases. The code generation is ... -
Black screen on 48k+Hello peeps Just bought a 48k+ was working fine then after leaving it off over night I turned back on to get a total black screen, no border etc. …
... display even if the CPU is disabled, dead or ... missing. Typically if the CPU is unable to store ... fault finding is to test all the supply voltages ... preferably a good digital one. Test the +5V, -5V, + ...
To test the voltages, either test the relevant pin on ... -
Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…
... joints on the lower RAM, CPU and caps (I recappped the ... />
I ran the soak test for two days continuously without ... error. I ran the RAM test again after Manic Miner (instant ... -
New ZX-Uno Spectrum CoreFor those who haven't noticed, a new Zx-Uno Spectrum core has been published: http://www.zxuno.com/forum/viewtopic.php?f=14&t=406 Those lucky e…
Early stages of TEST 21 featured a 28MHz CPU mode, but I ran ... select a clock for the CPU). Long story short: I had ... -
Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…
... software point of view, the CPU has to see just a ... and do use tricks to test for more than one key ... -
Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…
... software point of view, the CPU has to see just a ... and do use tricks to test for more than one key ... -
SMART card not workingHi all, I've got an issue 3 48k which appears to be working fine apart from with a Retroleum SMART card. The card (which works fine on my other Sp…
... ?
If you have another CPU, try swapping it. Otherwise this ... be hard to diagnose without test equipment like a 'scope. Having ... continuity to the relevant Z80 CPU pin, etc.
[b ... -
New K-MOUSE 2016-LPI plan make new PCB version of K-MOUSE 2016. This version will oneboard, horisontal, without cinch connector. "LP" at end sign LOW PRICE. Price of ho…
... .JPG[/img]
Test with DIVMMC, all work correct ... ]
And now test with DIVMMC + next K-MOUSE ... .JPG[/img]
CPU speed regulator slowdown only program ... routines as LOAD,SAVE,keyboard test stability,BASIC is always ... -
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…
... underlying formula, for an identical test sequence every time? Or ... where the same sequence of test procedures/values can give ... also on things like IR, CPU temperature and voltage and maybe ... over an identical sequence of test values. Therefore it probably makes ... -
Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…
... all inputs to the Z80 CPU. It cannot drive any of ... your ground connection for your test gear? A poor ground connection ... -
48K Issue 2 Spectrum showing exactly 16KI've acquired an issue 2 and it quickly became clear that only 16K of memory is available. I've read that some early 48K Spectrums with malfunctionin…
... , for the best quick test results, two values are ... order. But the same test can (and is) used ... continuity range to test between the Z80 CPU data pin and ... 4116 lower DRAM chips, test to the ULA pins). ... found various problems with test gear and equipment sold ... -
Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…
... respective data pin on the CPU. Note that for ease of ... found wrong when doing this, test the data line to both ...
