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T/S1000 Turbo Switch

Posted: Tue Mar 27, 2018 7:35 pm
by GCHarder
Has anyone ever tried this?

This seems so simple even I, soldering challenged that I am, could install it!

What could I expect the display to look like on a T/S1000 with LCD and Pokemon's ZX8-CCB installed?

Regards;

Greg

Re: T/S1000 Turbo Switch

Posted: Tue Mar 27, 2018 7:48 pm
by Andy Rea
all it appears to be doing is switching from 60hz to 50hz, giving the CPU more program execution time.

Regards Andy

Re: T/S1000 Turbo Switch

Posted: Tue Mar 27, 2018 9:46 pm
by McKlaud
As Andy said, switching between 60Hz and 50Hz ... in real terms the speed increase up to 30% in SLOW mode. In the FAST mode it does not make any difference at all.

If you are looking for a real speed-up solution, go for the modification called "noWAIT".

Re: T/S1000 Turbo Switch

Posted: Fri Apr 06, 2018 11:31 pm
by Bill H
Back in 2005 I did some testing on various ways of speeding up the TS1000:

The program that I used for benchmarking the ZX81, TS1000, TS1500 and ZX81 emulator grew out of a conversation on the board about speeding up Sinclair Basic:

5 LET A=40

10 LET S=PEEK 16436+256*PEEK 16437

20 FOR K=1 TO 1000

40 NEXT K

50 LET E=PEEK 16436+256*PEEK 16437

60 PRINT S,E,S-E

The test was to see how the speed changed based on using different values for "Goto" and is in frames (60 frames per second in US).

A few things of note from these tests:
Capture.JPG


The ZX81 is MUCH faster than the TS1000, even allowing for the 50hz versus 60hz of the US model.

The TS1500 is consistantly a few frames slower than the TS1000

There is no "real" way to test FAST mode since the FRAMES variable (locations 16436 & 16437) are not updated

Look at the results of the compiled version!

* Speeds for the ZX81 provided by Tarquin Mills of the ACCUS (Anglia Classic Computer Users Society) http://www.speccyverse.me.uk/c­omp/accus/

** Mcoder doesn't allow the use of strings so these tests could not be performed.

*** I "hacked" a TS1000 by cutting the R30 resistor to make it run at 50HZ instead of 60HZ. Though the screen rolls on my US TV, the speed pick up is about 60% over the standard 60HZ machine!


http://forum.tlienhard.com/TS1000/www.t ... sembly.htm


Bill H

Re: T/S1000 Turbo Switch

Posted: Sat Apr 07, 2018 4:34 am
by gammaray
Is that "WhyWait" or "NoWait"? "WhyWait" is only 10% improvement.
McKlaud wrote:
Tue Mar 27, 2018 9:46 pm
As Andy said, switching between 60Hz and 50Hz ... in real terms the speed increase up to 30% in SLOW mode. In the FAST mode it does not make any difference at all.

If you are looking for a real speed-up solution, go for the modification called "noWAIT".

Re: T/S1000 Turbo Switch

Posted: Sat Apr 07, 2018 3:24 pm
by 1024MAK
On the subject of the improved wait circuit, there are related threads here and here ;)

Mark