Looking for Prompt-475
dkelvey at hotmail.com
Thu Nov 3 09:42:46 CDT 2016
The UPP had a bug that was never fixed. The level for the
reset was inverted for the 4040 from the 4004. They'd
used a slow transistor to create the inverter but released
the 4040 before the 4001's. The first few fetches would
sometimes send it to strange places in the code.
The fix was simple, release the 4001 resets before the 4040.
The problem was in an app note. Their solution was to put
a few NOPs at the start of the code. It worked most of the time.
Of course, as an end of life, I don't think it ever got fixed.
From: cctech <cctech-bounces at classiccmp.org> on behalf of allison <ajp166 at verizon.net>
Sent: Thursday, November 3, 2016 7:24:35 AM
To: General Discussion: On-Topic Posts
Subject: Re: Looking for Prompt-475
On 11/2/16 2:18 PM, dwight wrote:
> It had been a long time since I'd worked at Intel
> but I recall having to use a different UPP board for each.
I worked for NEC microcomputers.... The other guys.
IT was a few lifetimes ago, before DEC.
> I worked on the UPP with the 4040 uP.
We had a MDS with UPP and a few others in the lad for those times
we needed comparative testing.
> I was a test engineer for its end of life. Debugging these was
> a pain in the butt so I made what I called a slowtime-ice.
> I'd replace the 4004 with my umbilical and talk to the various
> 4002s and 4001. Although, I wasn't suppose to, I had a dump
> of the ROMs to compare with.
> We were our own last customer to order 4001s.
;) Yes knowing how and doing was sometimes important to know it it even
That and some of the micros and such had some very strange things to be done
to pump them.
> From: cctech <cctech-bounces at classiccmp.org> on behalf of allison <ajp166 at verizon.net>
> Sent: Wednesday, November 2, 2016 9:30:13 AM
> To: General Discussion: On-Topic Posts
> Subject: Re: Looking for Prompt-475
> On 11/2/16 10:08 AM, dwight wrote:
>> You are aware that the 8755A and 8755 are programmed differently?
> Yes. I also have both so not an issue. Doesn't hurt that I was an
> microprocessors and peripherals aps-engineer
> when both were the drug on the market so I know the difference and how
> to do either. I'm more interested in
> 8755A as I have a few tubes of virgin NEC parts.
>> I believe the adapter is only for the 8755A.
> It is. The 8755 is the generic name as they were replaced by the 8755A
> fairly early in the parts life.
> Its likely I have to build it as they are scarce and fairly simple. The
> Intel schematic is helpful in it saves
> me time I may end of designing it myself.
>> From: cctech <cctech-bounces at classiccmp.org> on behalf of allison <ajp166 at verizon.net>
>> Sent: Wednesday, November 2, 2016 5:35:08 AM
>> To: cctech at classiccmp.org
>> Subject: Looking for Prompt-475
>> Looking for the schematic for Intel PROMPT-475, this is the 8755 adapter
>> board for the Prompt-48.
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