Spectrum Computing

I handle it differently. I have a special loop for the HALT state. ... Anyway, each particular emulator can choose its own way, as long as it behaves correctly (that is, as long as you get points in S.H.I.T. ). But, how the state should be saved to/loaded from szx has to be uniquely universally acc...

There is a thing regarding this -- if an emulator change its behaviour and while cpu is halted, keeps PC increased (on position "halt + 1"), the question is that there are new incompatibilities with saving to / loading from snapshots. Incompatibilities between emulators, as well as incompa...

There is a test HALT2INT, written by Woody. It is available in ZJoyKiler's collection: https://github.com/redcode/Z80/wiki/HALT2INT . On that page you can see the expected test result. Let's see HALT2INT v. 3, executed in Fuse 1.6: https://i.postimg.cc/phHX9Lpz/Halt2-Int-Fuse16.png So, Fuse 1.6 does...

Not me) I'm glad to update my emulator everytime when new info about emulation accuracy comes. I know that there is no perfection in emulation but we can get as close to it as we can :) I totally agree. Many thanks to ZJoyKiller for investigation, to people who tested on hardware, to Patrik for his...

Swan ZX Spectrum emulator 0.9.6 released Binaries: https://github.com/zoran-vucenovic/swan/releases/tag/v0.9.6 Precompiled for: - Windows 64 and 32 bit - Linux 64 bit, build for gtk2 or qt5 library (for qt5, libqt5pas library has to be installed ) Note: to hear sound in Swan, you need portaudio (det...

You might try autosaving snapshots in Swan.
You can go back with F5 (or any other key if you change it), or open history browser and go back in time: https://github.com/zoran-vucenovic/swan ... -snapshots

In Swan emulator you can reduce speed to 1/2, 1/4 or 1/8 of normal speed.

Hello! New version of Swan 0.9.2-beta: - Improved emulation accuracy ( Tests collected by redcode (ZjoyKiLer) were really helpful!) - Sound lagging on Linux seems to be solved ( TheMartian -- whenever portaudio gets stopped, now it is always terminated -- so terminating, not just stopping portaudio ...

Or you start a new sound buffer on reset, instead of continuing the buffer in use until it's full? Yes, that is so now -- the sound is stopped, then started again, with new buffer. Hm... I thought it would not be wrong to do that... Normally, Spectrum would not continue with playing the old sound w...

Thank you, TheMartian and the.beginner. I could reproduce sound problems in Linux on a slow virtual machine with low resources. I just tried with enlarging the buffer used by portaudio callback function, but it didn't seem to get much. I'm going to play more... I'll see if this article might help me...

I accuracy is your bag then you probably should join the discord: https://discord.gg/45W4bUB Our emulation chat has probably the biggest set of tests for all models of Speccies on the net by now, and it's very active with emulator development chat. Thanks, I logged in there now and I am going to ta...

New emulator: https://github.com/zoran-vucenovic/swan It's named Swan... I have had hard time with thinking of a cool name , so during development I named it SWAN ( S till W ithout A N ame), until I find a real name. So... it is the name. For a start, I made Windows (64 and 32 bit) releases ( https:...

Pegaz wrote: ↑Sun Aug 25, 2019 5:53 pm

Zoran wrote: ↑Fri Aug 16, 2019 1:50 pm Hello,

I am planning to start my own Spectrum emulator (yes, another one is just what is needed )

Dobro došao Zorane.
Glad to see some ex-yu Spectrum fans here and look forward to your future emulator.
Once again, welcome to this great forum.

Thank you!

Woodster wrote: ↑Sat Aug 17, 2019 5:25 pm Does that make sense?

Yes! Thank you very much.

Now, to be able to later implement memory contention, I am reading the table with partial timings, as Einar pointed to - https://www.worldofspectrum.org/faq/reference/48kreference.htm#Contention . I am not sure whether everything is quite clear to me. Could you please take a look at this. I will try...

It's easy to overlook the fact that no-one seems to have written a language with - surely - the obvious syntax: (x, y) = my_function(a, b, c, d) Python supports this syntax. The following programme: def my_function(a, b, c, d): return a + b, c + d x, y = my_function(1, 2, 3, 4) print(x) print(y) wi...

EX AF,AF' takes 4 t-states in total to fetch and process. Thank you. The tricky bit is managing on which ticks in the instruction a memory read or write actually happens, so you can time that with the memory contention that goes on in the RAM when read by the ULA to generate the display. It's not b...

Hello, I am planning to start my own Spectrum emulator (yes, another one is just what is needed :) ). The first step should be emulating the CPU. So, I started to read Zilog's manual and other docs found on http://www.z80.info/ , in order to implement instructions. Now, let me explain what I'm confu...