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Re: TT Rom access speedup

Posted: Sun Mar 10, 2019 11:47 pm
by Steve
Hey Atarian would it be possible for you to post a simplified guide with some mobo photos to help? Thx

Also is it possible for me to find out what speed my thunderstorm roms are? I can't program roms so it might be problematic for me.

Re: TT Rom access speedup

Posted: Mon Mar 11, 2019 9:50 am
by Atarian Computing
Steve wrote: Sun Mar 10, 2019 11:47 pm Hey Atarian would it be possible for you to post a simplified guide with some mobo photos to help? Thx

Also is it possible for me to find out what speed my thunderstorm roms are? I can't program roms so it might be problematic for me.
Sure, I can make a guide. I just need to finalize my custom ROMs and install them before I can do that.

You'd have to scrape away the sticker to reveal the chip details from one of the chips. No other way around it I'm afraid. But there are many variables involved so I wouldn't discount 150ns ROMs even though they didn't work for me.

TT Rom access speedup

Posted: Mon Mar 11, 2019 6:26 pm
by guus.assmann
Hello,

Here's a picture of the 2 diodes on pin 15 and 16.
The grey wire goes to the Eprom-CS at pin 22.
That's all there is to it.

BR/
Guus

Re: TT Rom access speedup

Posted: Mon Mar 11, 2019 6:29 pm
by Atarian Computing
guus.assmann wrote: Mon Mar 11, 2019 6:26 pm Hello,

Here's a picture of the 2 diodes on pin 15 and 16.
The grey wire goes to the Eprom-CS at pin 22.
That's all there is to it.

BR/
Guus
Exactly how I did mine :)

Re: TT Rom access speedup

Posted: Mon Mar 11, 2019 7:00 pm
by Icky
guus.assmann wrote: Mon Mar 11, 2019 6:26 pm Hello,

Here's a picture of the 2 diodes on pin 15 and 16.
The grey wire goes to the Eprom-CS at pin 22.
That's all there is to it.

BR/
Guus
H guss. You seem to have a large 2200uF cap piggy backing one of the original caps. Is this one of your mods?

Re: TT Rom access speedup

Posted: Mon Mar 11, 2019 7:12 pm
by guus.assmann
No, I've not mounted that capacitor.
But it doesn't hurt.

BTW: It's possible to mount a switch in series with the grey cable.
This makes it possible to have the standard speed.
May be needed in some cases, altough I've not encountered that yet.

BR/
Guus