ZXBaremulator 3.2

Struggling with Fuse or trying to find an emulator with a specific feature. Ask your questions here.
User avatar
Pegaz
Manic Miner
Posts: 493
Joined: Mon Nov 13, 2017 1:44 pm

Re: ZXBaremulator 3.2

Post by Pegaz »

zx81 wrote:
Sat Aug 01, 2020 9:11 am
Pegaz wrote:
Fri Jul 31, 2020 1:33 pm

I would just like to get rid of this buzzing sound, which we talked about earlier.
I don't know if you had time to investigate it, I just have this problem on each of my 3 pi models (2, 3, 3+) and I haven't been able to eliminate it, except using the old v2.0 version, which doesn't have a GPIO keyboard support.
However, BM has its advantages, such as precise emulation and the ability to easily connect the Spectrum keyboard and its also free.
I don't know which is the next equivalent variant, I guess ZX-Uno with twice the price than Pi, but also with greater potential for sure.
The new Next kickstarter is already around the corner, so everyone has something to choose for themselves...
The problem with the buzzing sound is that I can't reproduce it on my TVs. Could be that some TVs aren't happy with the 32 kHz sampling rate I use.

The ZX-Uno is dead. I own one, sleeping in his box. Nobody develops cores for it. Now, you can choose a MiSTer, Mistica or SiDi. But don't exist a FPGA core that his behaviour will be so precise as many software emulators. And nobody have enough motivation to enhance the cores. The most important core for MiSTer is NeoGeo.

The Next isn't for me, for less money I can have a MisTer with 128MB, I can live without his pretty keyboard.
Interesting, I didn’t know the situation with the zx-uno was so bad, I was just thinking of buying one.
In terms of emulation accuracy, what are the main differences between BM and ZX-Uno Spectrum core ?
Regarding buzzing sound, that remains as the only logical explanation, because I tried everything else (several Pi's, hdmi cables, power supplies) and it's always the same.
Is the sound part from v2.0 (including the sample rate you mention) the same or was it changed later, because I don't have a sound problem with this version.
I don't know much about that MisTer board, just noticed insane prices, say over $ 300.
Where do you find all that, cheaper than Next?
As for releasing source code, you are absolutely right.
There are too many thieves and dishonest people, who can't wait to take advantage of someone else's work.
For home use BM is quite good, as it is now.
0 x

User avatar
Mort
Dizzy
Posts: 64
Joined: Thu Jan 17, 2019 10:03 am
Location: Kent , England
Contact:

Re: ZXBaremulator 3.2

Post by Mort »

I have the same annoyance with people reselling the mags I lovingly scanned, I have hopefully stolen their thunder as I have rescanned most at 600dpi and made them freely available.

I can understand people selling the interface boards for the baremetal emulators as they do take skill and time to make but not the software itself . At a push the complete machine with the software inside of it , but that is contentious with the amount being charged by some .

I have a few spare c64 interface boards as you have to buy a minimum from Pcbway . But would not resell the software.

To be honest I just love tinkering so making the machines keeps me sane in these uncertain times :D
0 x
Scanner extraordinaire, 1000`s of magazines and Software from the 8 and 16 bit era now up on internet archive in lovely 600dpi.
Donations are welcome of items to scan that are no longer needed ;)

User avatar
Pegaz
Manic Miner
Posts: 493
Joined: Mon Nov 13, 2017 1:44 pm

Re: ZXBaremulator 3.2

Post by Pegaz »

Mort wrote:
Sat Aug 01, 2020 10:48 am
I have found no lag on either the Bmc64 emulator or the ZxBaremulator , They remind me of when I had the z80 emulator running in dos on the pc, just did what is needed to do and no windoze or operating system in the way.
I have always loved such dedicated machines.
Recently I adapted my old Toshiba Portege laptop with RealSpectrum emulator and MB02+ interface, as a default.
It performs really great, with support of a real floppy disks and saved me several hundred dollars for MB02. ;)
This old but still great emulator works best in pure DOS, I put it in the autoexec sequence and it boots up very quickly.
The biggest value of this emulator is full support for physical floppies, for almost all important Spectrum formats and interfaces.
It has full read/write support and I use it as an extremely valuable tool.
0 x

akeley
Manic Miner
Posts: 284
Joined: Sat Feb 01, 2020 5:47 pm

Re: ZXBaremulator 3.2

Post by akeley »

Problem with lag is that it needs proper measuring, because the differences are pretty subtle. And OS is not the only reason causing it so there definitely still is some.

You can get MiSTer + 32 SDRAM for ~ 170E. This will run 90% of the cores. ZX Uno is about half that price, but only good for ZX (other cores are half baked).
0 x

Mbwum73
Berk
Posts: 5
Joined: Wed Jul 22, 2020 4:10 pm

Re: ZXBaremulator 3.2

Post by Mbwum73 »

I never realized people steel from you by selling your hard work. In that case don't release the source code. I was only suggesting it because it could help development forward. It is very usable already though and I'm quite happy with it. I just hope you may find time and inspiration to continue the development. Even if the group of users is still small.

By the way... That buzzing sound I hear it too. After every boot for a few seconds. Didn't hear it 2.0 though.
0 x

User avatar
Pegaz
Manic Miner
Posts: 493
Joined: Mon Nov 13, 2017 1:44 pm

Re: ZXBaremulator 3.2

Post by Pegaz »

Mbwum73 wrote:
Sat Aug 01, 2020 12:45 pm
By the way... That buzzing sound I hear it too. After every boot for a few seconds. Didn't hear it 2.0 though.
Thanks for the confirmation, although it seems minor, this is a pretty annoying problem to me.
Earlier in this thread, I tested in detail the most common ways this issue is triggered.
Obviously it doesn’t happen to everyone, which is the worst case scenario for bugfixes...
0 x

zx81
Dizzy
Posts: 90
Joined: Sat Feb 17, 2018 9:33 pm

Re: ZXBaremulator 3.2

Post by zx81 »

Pegaz wrote:
Sat Aug 01, 2020 10:55 am
zx81 wrote:
Sat Aug 01, 2020 9:11 am
Pegaz wrote:
Fri Jul 31, 2020 1:33 pm

I would just like to get rid of this buzzing sound, which we talked about earlier.
I don't know if you had time to investigate it, I just have this problem on each of my 3 pi models (2, 3, 3+) and I haven't been able to eliminate it, except using the old v2.0 version, which doesn't have a GPIO keyboard support.
However, BM has its advantages, such as precise emulation and the ability to easily connect the Spectrum keyboard and its also free.
I don't know which is the next equivalent variant, I guess ZX-Uno with twice the price than Pi, but also with greater potential for sure.
The new Next kickstarter is already around the corner, so everyone has something to choose for themselves...
The problem with the buzzing sound is that I can't reproduce it on my TVs. Could be that some TVs aren't happy with the 32 kHz sampling rate I use.

The ZX-Uno is dead. I own one, sleeping in his box. Nobody develops cores for it. Now, you can choose a MiSTer, Mistica or SiDi. But don't exist a FPGA core that his behaviour will be so precise as many software emulators. And nobody have enough motivation to enhance the cores. The most important core for MiSTer is NeoGeo.

The Next isn't for me, for less money I can have a MisTer with 128MB, I can live without his pretty keyboard.
Interesting, I didn’t know the situation with the zx-uno was so bad, I was just thinking of buying one.
In terms of emulation accuracy, what are the main differences between BM and ZX-Uno Spectrum core ?
Regarding buzzing sound, that remains as the only logical explanation, because I tried everything else (several Pi's, hdmi cables, power supplies) and it's always the same.
Is the sound part from v2.0 (including the sample rate you mention) the same or was it changed later, because I don't have a sound problem with this version.
I don't know much about that MisTer board, just noticed insane prices, say over $ 300.
Where do you find all that, cheaper than Next?
As for releasing source code, you are absolutely right.
There are too many thieves and dishonest people, who can't wait to take advantage of someone else's work.
For home use BM is quite good, as it is now.
The ZX-Uno's Spectrum 48k core is basically correct, but the contended memory timings is wrong on all cores, all FPGA's I know. The 128k core isn't complete and the FPGA PLL can't generate the needed CPU freq. for the model (is off by 8 kHz). The +2a is the same core than 128k with the +2a ROMS. Anyway, the image quality is very poor, IMHO. Three years ago, could be that ZX-Uno was an option. Today, is obsolete.

All the ZXB versions uses the 32 kHz sampling rate. All my PIs runs correctly (B+, 2, 3, 3B+), so is a hard problem to debug. And change the sampling rate to 44.1 or 48 kHz isn't trivial.
0 x

akeley
Manic Miner
Posts: 284
Joined: Sat Feb 01, 2020 5:47 pm

Re: ZXBaremulator 3.2

Post by akeley »

zx81 wrote:
Sat Aug 01, 2020 3:27 pm
The ZX-Uno's Spectrum 48k core is basically correct, but the contended memory timings is wrong on all cores, all FPGA's I know. The 128k core isn't complete and the FPGA PLL can't generate the needed CPU freq. for the model (is off by 8 kHz). The +2a is the same core than 128k with the +2a ROMS.
How do contended memory timings affect accuracy? Could you give examples of software which does not work becasue of that?

It's the same for the 128K core, if they are meant in regard to MiSTer. I'm interested in perfecting these cores, so can ask questions about it but need some concrete examples of reproducible errors.
zx81 wrote:
Sat Aug 01, 2020 3:27 pm
Anyway, the image quality is very poor, IMHO.
Both ZX Uno and MiSTer's IQ is 1:1 perfect when compared to my real ZX Spectrums - tried it side by side on CRT TVs. Could you be more specific?
0 x

User avatar
Pegaz
Manic Miner
Posts: 493
Joined: Mon Nov 13, 2017 1:44 pm

Re: ZXBaremulator 3.2

Post by Pegaz »

@zx81

Just to be sure, I re-tested BM v3.2 today, on all three of my Pi's (2, 3, 3+) with small speakers connected to Pi and without any connection to the TV.
In all three cases, the buzzing sound is still there, which tells me that TV is not the cause of this problem after all.
So I think there is some change somewhere, starting with version v3.0, which is causing this sound issue.
The main “problem” is, that you haven’t experienced that issue and then it’s very hard to detect it.
However, if you get an idea, you can send a test version here, I'm sure some of us will gladly test and give full feedback...
0 x

User avatar
Mort
Dizzy
Posts: 64
Joined: Thu Jan 17, 2019 10:03 am
Location: Kent , England
Contact:

Re: ZXBaremulator 3.2

Post by Mort »

I have sent you the link for the C64 baremetal as this explains a lot . Especially as its from the author, and he also made Baremetal emulators to run from the same sd card for the Pet, Vic and C16.


0 x
Scanner extraordinaire, 1000`s of magazines and Software from the 8 and 16 bit era now up on internet archive in lovely 600dpi.
Donations are welcome of items to scan that are no longer needed ;)

Post Reply