Re: Differences between 8501R1 and 8501R4

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Mon, 9 Dec 2019 22:07:51 +0100 Message-ID: <40d01961-2c3f-39f4-7096-26ea35c12fc6_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 12/9/19 9:32 PM, Francesco Messineo wrote:
> On Thu, Dec 5, 2019 at 12:18 PM Anders Carlsson <anders.carlsson_at_sfks.se> wrote:
>>
>> Gerrit Heitsch wrote:
>>
>>> 2) The 8501R4 came out in 1986, after the 264 series already ended. I
>>> wonder why Commodore made a new revision.
>>
> 
>>
>> Is the R4 more reliable than previous revisions, which would explain why
>> they kept revising it (at low cost, hopefully) as part of getting the
>> remaining stock on market instead of writing it off as losses?
> 
> I hope it was more reliable. I have a few  dead 8501R1 in my
> MOS-dead-chips collection and I've never seen the R4 in real life.

Have a look then:

http://c128.com/sites/default/files/field/image/old-chips.jpg

  Gerrit