Author Topic: Info on Intel P87C521  (Read 2632 times)

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Offline StonentTopic starter

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Info on Intel P87C521
« on: December 31, 2012, 05:20:16 pm »
I've recently come across a few 40 pin DIPs with the following on them:

P87c521
L1027a327
Intel ©1980

From what I can tell they are an 8 bit Microcontroller, but my quest for a data sheet has come up short.
Every site I've found that claims to have a data sheet wants money for me to see it.  I would have thought Intel would have something but searching their site for p87c521 doesn't pull up anything.

Is anyone here familiar with this chip, what its specs are (ram/rom/fuses/sram/clock speed) or does anyone know where I can find a real data sheet or am I just stuck having to pay some third party which to me doesn't seem legit since they're distributing a document written by Intel?
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Offline nctnico

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Re: Info on Intel P87C521
« Reply #1 on: December 31, 2012, 05:42:55 pm »
Its an 8051 based microcontroller:
http://www.ryston.cz/pdf5/87541.pdf

I recognize the urge to find some use for it but in the end your time is better spend on something more up-to-date.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline StonentTopic starter

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Re: Info on Intel P87C521
« Reply #2 on: December 31, 2012, 06:03:14 pm »
256 Bytes of RAM? OUTSTANDING!  I think I'll get started on porting Linux to it right now!  :-DD
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Offline SeanB

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Re: Info on Intel P87C521
« Reply #3 on: December 31, 2012, 06:09:15 pm »
You can fly to the moon on 256 bytes of ram............

Or at least do a good small controller with it.
 

Offline free_electron

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Re: Info on Intel P87C521
« Reply #4 on: January 01, 2013, 01:00:44 am »
256 Bytes of RAM? OUTSTANDING!  I think I'll get started on porting Linux to it right now!  :-DD
any os needing more than a few bytes of ram for its i ternal housekeeping is bloatware!

The 8052 is very easy to make a multitasked , pre-emptive microkernel with a hundred bytes of code and 10 bytes of ram. The cpu has 4 registerbanks. You assign the kernel to 1 bank , and up to three processes each their own bank. You use a hardware timerto trigger a high priority interrupt that kicks in the kernel. The kernel saves two or three registers in the process page and does a contaxt swap.

Very easy to do. Since each program lives in its own bank there is no risk of ome process killing another.
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