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4MB Upgrade Help Appreciated - SMT MMU

Upgrade your RAM from ST to Falcon.
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1040STfit
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4MB Upgrade Help Appreciated - SMT MMU

Post by 1040STfit »

Hell, I'm almost finished with this on my 1040STf and I wanted to make sure I'm doing a couple things correctly...

I have a later motherboard revision C070859-001. It has a soldered in MMU.

So I'm just going to run a wire as I've drawn in my pic? Going from the RAM module to that point there on the resistor that leads to pin 64 on the MMU? Just wanted to double check my work with you guys so I don't fry something.

P1L9WN2.jpg
P1L9WN2.jpg (439.75 KiB) Viewed 3959 times

Lastly, when installing a 1MB/4MB toggle switch, the center pin on the toggle will be to ground and either side of that will be the 1MB/4MB connection points? Elementary, I know but just wanted to make sure.

Thanks for the help!
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exxos
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Re: 4MB Upgrade Help Appreciated - SMT MMU

Post by exxos »

1040STfit wrote: Sun Nov 22, 2020 8:50 pm So I'm just going to run a wire as I've drawn in my pic? Going from the RAM module to that point there on the resistor that leads to pin 64 on the MMU? Just wanted to double check my work with you guys so I don't fry something.
SMT GLUE is pin 66 (PLCC68 pin 64)
1040STfit wrote: Sun Nov 22, 2020 8:50 pm Lastly, when installing a 1MB/4MB toggle switch, the center pin on the toggle will be to ground and either side of that will be the 1MB/4MB connection points? Elementary, I know but just wanted to make sure.
No.. You just use a middle and 1 outer pin on the switch.. as it says on the PCB, Linked gives you 4MB, so "not linked" is 1MB. All it does is to switch in/out MAD9.

Also please note linking to external sites isn't allowed. I have corrected your post, but please see this topic for information on how to attach images thanks :)
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frank.lukas
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Re: 4MB Upgrade Help Appreciated - SMT MMU

Post by frank.lukas »

MAD9 = Pin66

not 64

Edit: ... to late !
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1040STfit
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Re: 4MB Upgrade Help Appreciated - SMT MMU

Post by 1040STfit »

So basically every single thing I posted was wrong including linking to my pic. Lol
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exxos
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Re: 4MB Upgrade Help Appreciated - SMT MMU

Post by exxos »

1040STfit wrote: Sun Nov 22, 2020 9:28 pm So basically every single thing I posted was wrong including linking to my pic. Lol
Better to ask now and not kill anything :)
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1040STfit
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Re: 4MB Upgrade Help Appreciated - SMT MMU

Post by 1040STfit »

Can I just solder to pin 66? I was excited to get this done tonight and SMT Glue is going to have me waiting a week for delivery!
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Re: 4MB Upgrade Help Appreciated - SMT MMU

Post by exxos »

1040STfit wrote: Sun Nov 22, 2020 9:57 pm Can I just solder to pin 66?
Yep. Use thin wire..
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