From: Gabriele Bozzi (mabuse68_at_gmail.com)
Date: 2005-12-10 17:47:03
Bo,
You probably know better this than me but I am wondering if your
jumpers are correctly cutted?
This is a link with pictures.
http://www.sothius.com/hypertxt/welcome.html?./additional/
cbm3016addition.html
Replacing the chips with 4116s?
GaB
On 10 Dec 2005, at 16:46, Bo Zimmerman wrote:
> Please forgive an obvious or potentially stupid question, but
> doesn't that
> mean that, since they are 16k X 1s, that they are 2k chips
> (16kilobits/8 = 2
> kilobytes). So, since I have 16 of them, wouldn't that make it a 32k
> machine?
>
> - Bo
>
>
>> -----Original Message-----
>> From: owner-cbm-hackers@ling.gu.se
>> [mailto:owner-cbm-hackers@ling.gu.se] On Behalf Of Gabriele Bozzi
>> Sent: Friday, December 09, 2005 6:34 AM
>> To: cbm-hackers@ling.gu.se
>> Subject: Re: Question about PET DRAM
>>
>>
>> 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
>>
>
>
>
> Message was sent through the cbm-hackers mailing list
>
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.