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Activate banks C and D without installing the PBS-TRI board.

 
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jarris



Joined: 23 Sep 2017
Posts: 2
Location: Czech Republic

PostPosted: Tue Sep 26, 2017 9:31 pm    Post subject: Activate banks C and D without installing the PBS-TRI board. Reply with quote

Good day everyone!
First of all, I want to thank everyone on this forum, who was my inspiration and basic idea. I would like to contribute now and close one chapter. As I draw from more threads, I have created this in order not to offend anyone. with so much introduction.
And now with instructions.
To activate Bank C and D in your TRINITY, you need:
1./ two NEC D431000ACZ-70L ICs,
2./ genuine PBC-TRI sound FDD disc (not necessary),
3./ cross screwdriver,
4./ little bit of time.
!!!First complete a backup your Trinity!!!
Remove the rear wall.
After removing the rear wall, you will see a centerboard with two slots in the middle. ( IC31 and IC32 PBS-TRI SRAM )
Here you put two ICs. Check the correct orientation!!!
At the some board is the PBS-TRI 68pin connector, it is necessary to connect the pins 67 and 68. ( I have chosen the route of the flyover to back side. )
Now screw all back together.
Press "enter" and "0" and turn on the power. SRAM initialization appears on the display. Release the buttons.
Now load the original sounds from the FDD. Positions C0-C7 do not play. Missing samples here - missing sample board. Other positions are fully functional.
And it is all! SurprisedD
I am sorry for my bad English. I hope the result will be a pleasure for you, as for me !!
Let our honest TRINITY live.
P.S. If need be, I can send you my pictures and sound bank.
jarris666@gmail.com
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tiretrak



Joined: 15 Oct 2017
Posts: 9

PostPosted: Mon Nov 27, 2017 9:35 am    Post subject: Re: Activate banks C and D without installing the PBS-TRI bo Reply with quote

jarris wrote:
Good day everyone!
P.S. If need be, I can send you my pictures and sound bank.
jarris666@gmail.com

hi
can you upload pictures here?
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jarris



Joined: 23 Sep 2017
Posts: 2
Location: Czech Republic

PostPosted: Thu Nov 30, 2017 8:02 pm    Post subject: Re: Activate banks C and D without installing the PBS-TRI bo Reply with quote

tiretrak wrote:
jarris wrote:
Good day everyone!
P.S. If need be, I can send you my pictures and sound bank.
jarris666@gmail.com

hi
can you upload pictures here?



image you can download here:
http://leteckaposta.cz/743166738
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tiretrak



Joined: 15 Oct 2017
Posts: 9

PostPosted: Mon Apr 15, 2019 11:29 am    Post subject: Re: Activate banks C and D without installing the PBS-TRI bo Reply with quote

jarris wrote:

image you can download here:
http://leteckaposta.cz/743166738

no fotos((
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k-Tracker



Joined: 19 Dec 2020
Posts: 2

PostPosted: Fri Jan 01, 2021 10:46 pm    Post subject: Reply with quote

Would you please post a PBS slot layout and location of pins 67 and 68 there?
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MattM



Joined: 02 Feb 2021
Posts: 2
Location: Australia

PostPosted: Tue Feb 23, 2021 10:36 pm    Post subject: Has anyone else tried this? Reply with quote

Hi,

As the heading says, has anyone else tried this memory upgrade?

If so could you report on the results please.

The parts seem readily available on fleabay and it seems straight forward. (Famous last words)
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MattM



Joined: 02 Feb 2021
Posts: 2
Location: Australia

PostPosted: Sun Aug 15, 2021 9:40 am    Post subject: Reply with quote

Hi All,

I have just replaced the soldered in back up battery with a button cell holder. Easy job, there are even holes ready to go, just the right distance apart.

Opening the thing up made me consider the idea of extra memory without the PBS-Tri board again. Mucking around looking at different banks of programs I had to choose between because of space limitations is the motivation.

The SRAM is readily available very cheaply.
Openning the Trinity to access the SRAM slots is straight forward.
Accessing the slot where the 2 pins need to be shorted is the same.

Is there a blank plug that could be have pins 67 and 68 shorted then just be plugged into the PBS-Tri socket available?

Seems this could be developed into a cheap kit of 2 sticks of SRAM and a plug with pin 67 and 68 shorted?

I have had no response from jarris so far. So, again, has anyone tried this? I have read reports of C and D banks continuing to function after the PBS-Tri was either removed or became disconnected, so it seems likely it could.

Does anyone have enough knowledge of the PBS -Tri socket to know if shorting pin 67 and 68 could cause damage?

Any thoughts on this welcome. I have some SRAM on the way.

Cheers,
Matthew
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