Search found 701 matches
- Sun May 19, 2024 9:42 am
- Forum: Design/Ideas
- Topic: Context-sensitive buttons in ZX Spectrum game...?
- Replies: 7
- Views: 121
Re: Context-sensitive buttons in ZX Spectrum game...?
I suppose with a 2D game you could tag tiles on a map for where different events can occur, such as only using a key directly in front of a door, but also with a check that you have the right key to use. I wrote a game a few years back called Wonky One Key , which is a 2D platormer with a single co...
- Fri May 17, 2024 3:46 pm
- Forum: ZX Spectrum Next
- Topic: Learning C games dev for the ZXN
- Replies: 22
- Views: 364
Re: Learning C games dev for the ZXN
The biggest problem is the 'classic' vs 'newlib' situation. Half the libraries, tutorials, documentation, forums posts etc. are for classic and the other half are for newlib. Each library has its pros and cons but newlib is officially a dead end. Or at least semi-officially to add to the confusion....
- Fri May 17, 2024 9:57 am
- Forum: ZX Spectrum Next
- Topic: Learning C games dev for the ZXN
- Replies: 22
- Views: 364
- Fri May 17, 2024 8:24 am
- Forum: ZX Spectrum Next
- Topic: Learning C games dev for the ZXN
- Replies: 22
- Views: 364
Re: Learning C games dev for the ZXN
Put the math library link flag at the end of the line:
Code: Select all
gcc -O2 -Wall -o nextbmp nextbmp.c -lm
- Wed May 15, 2024 11:45 am
- Forum: Hardware
- Topic: CPU not starting
- Replies: 31
- Views: 595
Re: CPU not starting
In the last set of tests, the ULA is not fitted, hence there is no AC signal, the circuit is only operating in a static / DC state. This is primarily to confirm that in a static state it is working okay. It's much easier to pick up basic faults in a static state. Oh yes, of course, that's why the U...
- Wed May 15, 2024 10:11 am
- Forum: Hardware
- Topic: CPU not starting
- Replies: 31
- Views: 595
Re: CPU not starting
Sorry to stick by rather uninformed oar in again, but... Are you not measuring variable voltages (i.e. AC) with a digital multimeter and trying to interpret the results as DC? If I have, say, a 3.5MHz clock signal, which swings from 0V to +5V on a duty cycle of 50%, what would I expect to see if if ...
- Tue May 14, 2024 8:54 am
- Forum: Hardware
- Topic: CPU not starting
- Replies: 31
- Views: 595
Re: CPU not starting
I've got a couple of traces from an issue 3 for comparison. This is from pin 32 of the ULA: https://i.ibb.co/wCcxxD9/NewFile2.png The waveform is the same as yours, which is good because it means your ULA is working. Or at least I think it does. I don't know how to read your 'scope's output. It look...
- Mon May 13, 2024 12:51 pm
- Forum: Emulators
- Topic: Issues with emulators for Linux
- Replies: 24
- Views: 427
- Mon May 13, 2024 12:04 pm
- Forum: Emulators
- Topic: Issues with emulators for Linux
- Replies: 24
- Views: 427
- Mon May 13, 2024 12:01 pm
- Forum: Hardware
- Topic: CPU not starting
- Replies: 31
- Views: 595
Re: CPU not starting
You do need to tell us how you're observing the clock signal and the waveforms around the transistor. If you have an oscilloscope do you know how to capture images from it so you can upload them?
- Mon May 13, 2024 9:14 am
- Forum: Hardware
- Topic: CPU not starting
- Replies: 31
- Views: 595
Re: CPU not starting
Don't connect the ULA directly to the CPU. That's not a good idea. You said "cpu clock on pin 6 is incorrect". What do you mean, "incorrect"? Stuck high? Stuck low? Erratic level? Valid signal but at the wrong speed? Give us some details to work with! Also, what test equipment ar...
- Sun May 12, 2024 6:27 pm
- Forum: ZXDB Discussion
- Topic: Manic Miner/Jet Set Willy no longer available
- Replies: 45
- Views: 1739
Re: Manic Miner/Jet Set Willy no longer available
Given Manic Miner's copyright is disputable (if I'm reading joefish's comment correctly) I humbly suggest MM should be made available again. If they (SP) truly care about it they will need to submit a takedown request with legal proof etc. A takedown request is one option they might pursue. Another...
- Sat May 11, 2024 1:15 pm
- Forum: ZXDB Discussion
- Topic: Manic Miner/Jet Set Willy no longer available
- Replies: 45
- Views: 1739
Re: Manic Miner/Jet Set Willy no longer available
But then there's this, about Manic Miner : <snip!> I read that a few times, trying to understand why the author wasn't just dismissing their own argument. I was rather baffled by it, but I think I eventually understood the point being made. The ultimate point being made is that Software Projects ow...
- Thu May 09, 2024 6:19 pm
- Forum: ZXDB Discussion
- Topic: Manic Miner/Jet Set Willy no longer available
- Replies: 45
- Views: 1739
- Thu May 09, 2024 12:45 pm
- Forum: ZXDB Discussion
- Topic: Manic Miner/Jet Set Willy no longer available
- Replies: 45
- Views: 1739
Re: Manic Miner/Jet Set Willy no longer available
What's sad about that document is it's written by a paralegal. Not a solicitor. It carries no weight whatsoever. Look it up. It wouldn't carry any weight if it had been written by a solicitor either. Until a judge rules on it, it's just people saying what they think, making claims and counterclaims...
- Thu May 09, 2024 9:28 am
- Forum: ZXDB Discussion
- Topic: Manic Miner/Jet Set Willy no longer available
- Replies: 45
- Views: 1739
Re: Manic Miner/Jet Set Willy no longer available
Can't remember (or no one knows?) if it was a bug or deliberate that the tune got progressively worse the more lives you lost (I think one of the delay times for the notes was linked to the number of lives remaining). It was a feature! It's in the disassembly, here . Because I always played with in...
- Wed May 08, 2024 12:18 pm
- Forum: Games/Software
- Topic: Hidden message in Predator
- Replies: 14
- Views: 368
Re: Hidden message in Predator
FWIW I was a student in Southampton and liked it very much. I still live a bit (well, quite a bit) up the road from there.
- Fri May 03, 2024 8:39 am
- Forum: Hardware
- Topic: Pico based Spectrum ROM interface (photoessay)
- Replies: 37
- Views: 1687
- Fri Apr 26, 2024 4:27 pm
- Forum: Hardware
- Topic: DC-DC mod query
- Replies: 6
- Views: 496
Re: DC-DC mod query
To complete the story, in case anyone finds it in a search, I got the DC circuit working. I desoldered the cluster of components, then rejoined them all spread out so I could get access to those underneath. I then printed out the circuit shown here , and went through it point by point, ticking off e...
- Sun Apr 21, 2024 11:26 am
- Forum: Games/Software
- Topic: Jetpac to Microdrive
- Replies: 25
- Views: 1242
Re: Jetpac to Microdrive
There's a remarkably in depth discussion of this exact question from about a year ago here.Redgatemodels wrote: ↑Sun Apr 21, 2024 10:16 am Hi, I guess this is a rookie question, but I am trying to get Jetpac onto microdrive and have failed.
Can it be done?
- Fri Apr 19, 2024 8:16 pm
- Forum: Programming
- Topic: Goodbye,Z80
- Replies: 35
- Views: 2122
- Thu Apr 18, 2024 3:48 pm
- Forum: Hardware
- Topic: DC-DC mod query
- Replies: 6
- Views: 496
Re: DC-DC mod query
I know it's hard to tell, but if TR4 is getting hot, one of the 4116 (or equivalent) "lower" DRAM chips may have failed and is now drawing excessive current. Hence dragging the +12V rail down. I'll have a closer look at your photo later when I'm on a PC. This is the current working versio...
- Thu Apr 18, 2024 3:34 pm
- Forum: Hardware
- Topic: DC-DC mod query
- Replies: 6
- Views: 496
Re: DC-DC mod query
The website/blog you linked to is mine BTW. Yes, I thought so. Thanks for doing that. I wanted to tell you that the schematic has two D15 diodes on it, which has rather puzzled me. I think one of them is actually the new D17 which is one of my green dotted diodes in my image? I was also a bit puzzl...
- Thu Apr 18, 2024 12:17 pm
- Forum: Hardware
- Topic: DC-DC mod query
- Replies: 6
- Views: 496
Re: DC-DC mod query
That's an excellent video, but his final work doesn't look much like the board I have!
I'm still working on it...
I'm still working on it...
- Thu Apr 11, 2024 6:13 pm
- Forum: Hardware
- Topic: DC-DC mod query
- Replies: 6
- Views: 496
DC-DC mod query
I have an issue 3 board which has a faulty 12V supply (reads a wobbly +1.2V). -5V works correctly. I've never tried to fix a DC-DC problem before, so I thought I'd start from first principles. The board has had a DC-DC mod of some sort, so I've had a good look at it and taken notes. Here's an annota...