T/S1000 Turbo Switch

Discussions about Sinclair ZX80 and ZX81 Hardware
Post Reply
User avatar
GCHarder
Posts: 191
Joined: Sat Dec 14, 2013 7:46 pm

T/S1000 Turbo Switch

Post by GCHarder » Tue Mar 27, 2018 7:35 pm

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
Attachments
Turbo Switch.zip
Article scans
(102.71 KiB) Downloaded 32 times

User avatar
Andy Rea
Posts: 1469
Joined: Fri May 09, 2008 2:48 pm
Location: notts UK

Re: T/S1000 Turbo Switch

Post by Andy Rea » Tue Mar 27, 2018 7:48 pm

all it appears to be doing is switching from 60hz to 50hz, giving the CPU more program execution time.

Regards Andy
6 x ZX81, 1 x TS1500 , 1 x +3e, 1 x timex 2040 printer, 1 x timex 2020 cassette deck, siclair printer and some spectrum

McKlaud
Posts: 142
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: T/S1000 Turbo Switch

Post by McKlaud » 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".
Claudius
----------

Bill H
Posts: 150
Joined: Sat Nov 27, 2010 6:05 pm

Re: T/S1000 Turbo Switch

Post by Bill H » Fri Apr 06, 2018 11:31 pm

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

User avatar
gammaray
Posts: 475
Joined: Sun Apr 17, 2016 2:44 am
Location: Texas

Re: T/S1000 Turbo Switch

Post by gammaray » Sat Apr 07, 2018 4:34 am

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".
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND+AY, ZeddyNET, ZXBlast..., unfinished Spectrum...Still no life!

User avatar
1024MAK
Posts: 2044
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: T/S1000 Turbo Switch

Post by 1024MAK » Sat Apr 07, 2018 3:24 pm

On the subject of the improved wait circuit, there are related threads here and here ;)

Mark

Post Reply