Re: Determining amount of RAM on a board?

["william strutts" <wrstrutts1@nospam.home.com>]

"Ernest" <ernestls@home.com> wrote in message
news:izmf7.31447$vW2.13893050@news1.sttln1.wa.home.com...
> Is there an easy way to find out how much RAM an Apple II has, or more
> specifically, an Apple II clone? I'm not familiar enough with the
different
> chips to be able to easily tell by looking at the physical RAM on the
board.
> If I see several rows of chips in the RAM area on the mainboard, how do I
> determine whether it's 48 or 64k?
>
> Thanks
>
> E.
>

Most chips will have something in the line of 44xx or 41xx
The 44 series is 4 bits wide and 41 series is 1 bit wide.
The older computers used for the most part 1 bit wide chips.
4104  - 4k x 1
4108 -  8k x 1
4116  -16k x 1
4164 - 64k x 1

Of course, that wasn't always true. It varied by manufacturer
but it was the most common numbering scheme I have seen.
Often they will have a dash number after the chip number.
This is the speed of the Ram.  For example, a 64K x 1 chip
that is 120 ns will be marked "4164-12".  If it was 100 ns,
it would be marked "4164-10".  70 ns "4164-7".
--
--
William R. Strutts - wrstrutts1@nospam.home.com - Whatever!

C'est moi!  http://www.facelink.com/wrstrutts

Just hacking away...

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