DIY TT Booster?

General discussions or ideas about hardware.
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mrbombermillzy
Posts: 51
Joined: Sun Jun 03, 2018 7:37 pm

DIY TT Booster?

Post by mrbombermillzy » Sun Aug 19, 2018 5:41 pm

Im not really an Atari hardware guru, so forgive my ignorance of the subject if I am totally off but...

Is the older TT CPU daughterboard not a VMEBus card of some type, or can be made to act as such?

If so, with the CPU being replaced by either:

1. A 48>Mhz xtal and a heatsink for the CPU :twisted:
2. A faster version of the 030
3. An 040/060 + xtal

would it be possible to turn it into an accelerator?

Im guessing 'no', but have never found this question asked before... (a bit like my reserved TT video mode question! lol )

tuxie
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Joined: Thu Aug 24, 2017 11:51 am

Re: DIY TT Booster?

Post by tuxie » Sun Aug 19, 2018 6:00 pm

Hello,

yes it is possible, the TT runs well with 40/20 Mhz, and gets a 25% Speed boost overall.

What is todo !
1. Replace the 32Mhz oscilator against a 40mhz Oscilator
2. You need to generate a 500Khz clock for the acias, simples ist take a HD4024 counter and divide the clock signal
3. Desolder Pin 3 and 4 of both Acias and provide the new 500khz clock signal
4. Take a HD-Modul and Provide the Floppycontroller a new 8/16Mhz Clock signal
5.... find a solution to provide a new clock signal to the Sound Chip otherwise the sound runs to fast and sometimes you get bombs.


Simple, just some work.. mine TT runs well with this configuration



Edit: Forgot it,..... the Own TOS decoder using a gal, because the internal Rom Chips select Signal is slower then it should be..

mrbombermillzy
Posts: 51
Joined: Sun Jun 03, 2018 7:37 pm

Re: DIY TT Booster?

Post by mrbombermillzy » Mon Aug 20, 2018 9:06 pm

Well, thanks for the concise answer Tuxie! :thumbup:

I guess that I can give that a go at some point.

Steve
Posts: 176
Joined: Fri Sep 15, 2017 11:49 am

Re: DIY TT Booster?

Post by Steve » Tue Aug 21, 2018 7:57 am

I have heard that there is a TT booster coming soon from the guys at thunder/storm, might be worth waiting for.

tuxie
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Re: DIY TT Booster?

Post by tuxie » Tue Aug 21, 2018 8:14 am

Yes we are working on it, but it would hard work to put it into the TT because some chips has to be desloldered... (6)

mrbombermillzy
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Re: DIY TT Booster?

Post by mrbombermillzy » Tue Aug 21, 2018 7:39 pm

@Tuxie: Damn. I thought the VMEBus would have made this sort of thing much easier. :(

Is there some major show stopper missing from VMEBus specification then?

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rpineau
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Re: DIY TT Booster?

Post by rpineau » Tue Aug 21, 2018 7:53 pm

The VMEbus on the MegaSTE and TT are slave only, they can't be master, so they can't have a CPU taking over the machine on them.
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

mrbombermillzy
Posts: 51
Joined: Sun Jun 03, 2018 7:37 pm

Re: DIY TT Booster?

Post by mrbombermillzy » Tue Aug 21, 2018 10:10 pm

Thanks for the clarification RPineau.

Not having studies VME in great detail, I had a feeling there was something like that being the reason no-one had done anything other than the CaTTemaran thing.

Oh well, heres hoping Tuxie can come up with something elegant :dualthumbup:

tuxie
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Re: DIY TT Booster?

Post by tuxie » Wed Aug 22, 2018 8:07 am

What i already wrote in a other thread, we are working on a Booster but it will be never a plug and play solution.

All time a solder solution.....

48Mhz CPU like on CaTTamaran but with higher Efficiency and not with the switching mode, CPU runs all time with 48mhz not like in Cattamarn. (CaTTamaran switches to 48Mhz when the CPU isnt accessing the Bus)

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