Author Topic: GX4000 Ram upgrade  (Read 289 times)

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Offline eto

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GX4000 Ram upgrade
« on: 17:23, 11 December 21 »
I have seen this PCB on Facebook and it seems to be a very simple RAM upgrade for the GX4000. I haven't found this documented anywhere, but it seems to be as simple as removing a RAM chip, adding this PCB with 2 RAM chips and you are all set. Is this really possible?






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Offline gerald

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Re: GX4000 Ram upgrade
« Reply #1 on: 18:51, 11 December 21 »
I've made similar board eons ago but for both RAMs (ie 2 chip to 4 chips).

The main issue is that there is not much space in the GX4000 case for such an assembly, be it on height point of view (the power switch) or on the side. The board I made required filing the PCB on the side to match the case, and final prevented the case to be close due to the power switch.

I finally find it easier and faster to piggy pack the ram and have a single wire for the CAS signal.
« Last Edit: 18:54, 11 December 21 by gerald »
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Offline eto

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Re: GX4000 Ram upgrade
« Reply #2 on: 19:08, 11 December 21 »
I finally find it easier and faster to piggy pack the ram and have a single wire for the CAS signal.

Where would CAS1 come from? Is there a connection easily availably on the board?
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Offline gerald

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Re: GX4000 Ram upgrade
« Reply #3 on: 19:16, 11 December 21 »
CAS1 is the tricky part : you have to solder a wire on ASIC pin 91. It's not available anywhere else.
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Offline AnakinTF

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Re: GX4000 Ram upgrade
« Reply #4 on: 11:30, 12 December 21 »
You need to remove the original RAM chip and replace with that board. The new RAM must go without sockets to fit it in place. Like you see in the board you need make a connection in two points, 1 point in the first board to pin 91 on ASIC and second a connection between two boards with 2Board pin. Remember use capacitor and resistor.
« Last Edit: 12:23, 12 December 21 by AnakinTF »
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