From: Gabriele Bozzi (mabuse68_at_gmail.com)
Date: 2005-12-09 13:34:27
Here is an interesting posting:
http://classiccmp.org/pipermail/cctalk/2002-March/069729.html
****** Attached posting ******
There were several makers that sported an xx15 type where the normal 16Kx1
dram was an xx16. What these were, generally but not in all cases, were
products of a die shrink that resulted in a shorter refresh interval. That
was certainly the case with the MOSTEK 4115's. Those worked famously well in
applications like the Apple][ which was a big seller at the time.
****** End attached posting ***
So, it seems to be a pin-compatible 4116.. I guess a 400ns item from the
part number you mention (which is not unusual with the double nature of
"phi" clocking of the 6502".
I am not a PET expert but imho the design of this machine did not allow use
of esotheric parts (different pin-count etc.).
I guess good old 4116s (provided access-speed copes) should do.
Gabriele
On 12/8/05, Bo Zimmerman <bo@zimmers.net> wrote:
>
>
> Hello all... I recently got a CBM 2016-N that appears to be working fine.
> It reports the appropriate 16k at startup and everything. My surprise can
> when I popped the case. Inside I found that all 16 ram banks were filled,
> as on a 32k machine.
>
> My first thought was that it was an upgraded 2016 which SHOULD be
> reporting
> 32k, but has a bad chip. But first I needed to make sure that those two
> rows of dram really represent 32, so I looked up the part number
> (MK4115p-40) and found nothing. The 2001N schematics show that those
> banks
> should have 4116 chips, which are 16k by 1s.
>
> Can anyone help me out on what a 4115 is? And whether 16 of those bad
> boys
> makes 16k or 32?
>
> - Bo
>
>
> Message was sent through the cbm-hackers mailing list
>
--
***********************************************
Gabriele Bozzi
Beveren - Belgie
A: Maybe because some people are too annoyed by top-posting.
Q: Why do I not get an answer to my question(s)?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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