17 Dec
2019
17 Dec
'19
9:30 a.m.
An ad was emailed to me today with an interesting item: RCA 1802 processors. I thought
there may be some folks here interested:
https://www.bgmicro.com/9z1509.aspx
Not affiliated in any way other than a customer.
Will
11:22 a.m.
They are likely later than the 70s and even more likely Intersil made parts
from
the 80s and even later. Same for 1806s.
People forget that Chrysler used them for engine controls int he late 80s.
There is also "refurb parts" of questionable quality and origin.
Allison
On Tue, Dec 17, 2019 at 1:56 PM Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:
On 12/17/19 9:30 AM, Will Cooke via cctalk wrote:
An ad was emailed to me today with an interesting
item: RCA 1802
processors.
Not a bad price, did you buy any?
Were they actually RCA-branded parts from the 70's?
11:52 a.m.
According to the website, they are ?genuine? original RCA parts.
TTFN - Guy
On Dec 17, 2019, at 11:22 AM, crufta cat via cctalk
<cctalk at classiccmp.org> wrote:
They are likely later than the 70s and even more likely Intersil made parts
from
the 80s and even later. Same for 1806s.
People forget that Chrysler used them for engine controls int he late 80s.
There is also "refurb parts" of questionable quality and origin.
Allison
On Tue, Dec 17, 2019 at 1:56 PM Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:
>
>
> On 12/17/19 9:30 AM, Will Cooke via cctalk wrote:
>> An ad was emailed to me today with an interesting item: RCA 1802
> processors.
>
> Not a bad price, did you buy any?
> Were they actually RCA-branded parts from the 70's?
>
>
>
18 Dec
18 Dec
12:26 a.m.
On Wed, Dec 18, 2019 at 2:55 AM Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
On 12/17/19 9:30 AM, Will Cooke via cctalk wrote:
Definitely a good buy if you don't need to go faster than 3.2MHz with
+5V Vcc (I have at least one 1802 board with a socketed oscillator so
I can use an NTSC colorburst crystal (3.579545 MHz) on a divide-by-2
to run at 1.7897725 MHz for use with a CDP1861 "Pixie" video chip, or
swap that out for a 5Mhz or 6Mhz crystal for faster operation). The
CDP1802BC can go up to 5MHz with a 10MHz oscillator on the same board.
An ad was emailed to me today with an interesting
item: RCA 1802 processors.
Not a bad price, did you buy any? Were they actually RCA-branded parts from the
70's?
Curious to know too but I'd expect a Harris part just because of
general availability.
-ethan
12:52 p.m.
Ethan,
I've used parts with 1976 date code at 4mhz and higher.
Later part with early 80s date codes and intersils part have been
over clocked to well over 8mhz and many. I have a few mid 80s
part that have given no issues at 5mhz though it never occurred
to me to push further. I recently got a few 1806s that clock at 8mhz
without issues.
I always thought they were low but never pushed. When I did
they ran a bit quite faster than expected..
Allison
On Wed, Dec 18, 2019 at 3:26 AM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:
On Wed, Dec 18, 2019 at 2:55 AM Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
On 12/17/19 9:30 AM, Will Cooke via cctalk
wrote:
> An ad was emailed to me today with an interesting item: RCA 1802
processors.
Not a bad price, did you buy any?
Definitely a good buy if you don't need to go faster than 3.2MHz with
+5V Vcc (I have at least one 1802 board with a socketed oscillator so
I can use an NTSC colorburst crystal (3.579545 MHz) on a divide-by-2
to run at 1.7897725 MHz for use with a CDP1861 "Pixie" video chip, or
swap that out for a 5Mhz or 6Mhz crystal for faster operation). The
CDP1802BC can go up to 5MHz with a 10MHz oscillator on the same board.
Were they actually RCA-branded parts from the
70's?
Curious to know too but I'd expect a Harris part just because of
general availability.
-ethan
1835
days inactive
1836
days old
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