Re: 6264 > 6116 advantage
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Not a Matrix 12 expert but I took a quick look at the schematics.
This looks to me like a way to give the factory the flexibility to either use 6116 or 6264 IC's, depending on which are easier (cheaper?) to get a? hold of.
I wonder what that looked like because 6116 is 24 pin while 6264 is 28 pin. The circuit board must have the traces and holes for a 28 pin socket then?
I expect that the amount of RAM that is actually used (addressed) by the firmware does not change. And that even if it's not spelled out, in the 6264 case only 4 RAM chips would be installed. Note how they talk about 4 extra jumpers to RAM0*, RAM1*, RAM2*, RAM3*. My guess is only those get installed.
Op za 25 jan. 2020 om 23:43 schreef leo-666 via Groups.Io <leo-666= [email protected]>:
Hello.
My question is regarding Matrix 12 RAM chips.
On CPU board there are RAM0, RAM1, RAM2, RAM3 chips.
Usually they are 6116 (2x8) in every Matrix 12 guts that I've seen.
(Xpander states 3 x 6264.)
In Matrix 12 service manual there's a note that 4 x 6264 can be used instead of 6116.
What's the advantage of this ? Is it really can quadruple RAM capacity ?
In this case probably all other chips are not needed.
Matrix has 16 RAM ICs, if using 6116 it turns out 16x2x8 = 256.
And if using 6264 ---- 4x8x8 = the same 256.
But as I understood, even in case when using 4 x 6264s, all other ICs (except U24 and U25) are also
needed.
Can somebody put some light on this theme.
Thanks...
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