A500 rev6A 1 MB chip RAM

[BLTCON0]

I installed the 4 extra chips onboard but without the matching capacitors (like the existing chips have below them). Should I add those too? I suppose the holes are there for some reason but on the other hand I haven't had any problems running the system without them.

 

[Zetr0]

these are decoupling capacitors. they reduce the noise inherrent on the power rails when you introduce electronic circuirty.

you could add them - they are 0.1uf monolytic capacitors, although I do doubt you need them.

 

[BLTCON0]

Thanks
BTW I took a look at the A500+ 8A board apparently it uses 1 capacitor per 2 chips, although I'm not sure I can use this to reason not installing them on the 6A.

 

[TheCorfiot]

Yes you can, I never bothered installing them either

Seriously though, If it aint broke, don't fix it.
If you start experiencing RAM faults or yellow screens then you can start by fitting these caps..

TC

 

[BLTCON0]

Fair enough, the hell with the caps. Will save me a drive downtown, to say the least

 

[bgsjust]

Hello guys,

Can i use 256k rams in the memory upgrade process ?

I have a rev6a A500 i want to upgrade it to 1Mb chip at least.

I got this rams, i read somewhere that the leftover ram will be discarded is it true ? Will this work ?



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Hello guys, can i use 256k rams in the memory upgrade process ?

I have a rev6a A500 i want to upgrade it to 1Mb chip I got 256k rams.

I read somewhere that the leftover ram will be discarded is it true ? will this work ?

 

[Zetr0]

@bgsjust

Hello there, lets see if I can help.


In regards to the A500, you will need 4 * (256k*4 bits) 20 pin x4256 chips. You shouldn't need the decoupling monolithic capacitors, but if you are experiencing boot failures of green / yellow screens or frequent guru notices then you should probably add them (they are "0.1uF").

Remember you will need to Cut and join JP2 and cut JP7A - (have a read here)


This will yield 512KB of 16bit RAM in an additional two banks on the A500.


Now, on another note, your user name should not be your email address, I would humbly advise that you ask a staff member to change it for something else you want.