Slowing down QPC 2 or uQLx to original QL speed

Discussion and advice about emulating the QL on other machines.
Maskenlos
ROM Dongle
Posts: 7
Joined: Sat Nov 03, 2018 12:14 pm

Slowing down QPC 2 or uQLx to original QL speed

Postby Maskenlos » Thu Oct 17, 2019 7:36 am

Hi all,

I tried to find some information in the forum how to slow down QPC2 or uQLx to the original QL speed but so far I was not successful.
Any idea is highly appreciated.

Cheers,

Stephan


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tofro
QL Wafer Drive
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Joined: Sun Feb 13, 2011 10:53 pm
Location: SW Germany

Re: Slowing down QPC 2 or uQLx to original QL speed

Postby tofro » Thu Oct 17, 2019 8:17 am

Stephan,

uqlx doesn't have any in-built mechanisms to slow it down to QL speed - It was originally developed when the emulator even struggled to keep up with an original QL.

QPC knows the SLUG command that can slow down interactive programs (that wait for keyboard input)

Then there is a number of programs that keep the emulated QL busy with other (scheduler loop) tasks to slow it down, namely

Norman Dunbar's SlowGold

Unknown artist's Slug

Both programs will need quite a bit of experimenting to get the settings right, and might not be able to slow down programs that completely by-pass the operating system.

Your best bet to get original QL speed for arbitrary programs is to use QEmulator or (I think) the new ZEsarUX emulators.

Tobias


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Peter
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Re: Slowing down QPC 2 or uQLx to original QL speed

Postby Peter » Fri Oct 18, 2019 8:35 am

If hardware is an option, the Q68 can run at QL speed by actually slowing down the CPU in hardware. A little tuning is still required because the Q68 CPU timings are not cycle accurate to the 68008. But in my experience it works better that the software tricks, especially for games that bypass the OS.


Derek_Stewart
QL Wafer Drive
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Joined: Mon Dec 20, 2010 11:40 am
Location: Runcorn, Cheshire, UK

Re: Slowing down QPC 2 or uQLx to original QL speed

Postby Derek_Stewart » Fri Oct 18, 2019 9:12 pm

Hi,

Is it possible to slow down the 68008 CPU?


Regards,

Derek

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