Intel microcontroller chips early 80's ?

M

Marc Geyskens

Guest
Does anybody here know of an Intel micro controller with a pin out
equal to the MCS-51 series but a bit different ?
No type numbers, manufactured by Intel and Siemens.
The most obvious difference I found is the external address pin is
active H instead of L with MCS-51.
The controller is broken, I'm trying to replace it with a 80C31, so
far no luck, code seems to execute from EPROM but watchdog keeps
resetting, so there are more differences.
Any help appreciated.

mg
 
On Mon, 28 Feb 2005 13:04:44 +0100, the renowned "Jeroen"
<none@none.com> wrote:

"Marc Geyskens" <emgee@village.uunet.be> schreef in bericht
news:tk91219mv9uqa1s7aerks6vcg7h4a4os8t@4ax.com...
Does anybody here know of an Intel micro controller with a pin out
equal to the MCS-51 series but a bit different ?
No type numbers, manufactured by Intel and Siemens.
The most obvious difference I found is the external address pin is
active H instead of L with MCS-51.
The controller is broken, I'm trying to replace it with a 80C31, so
far no luck, code seems to execute from EPROM but watchdog keeps
resetting, so there are more differences.
Any help appreciated.

mg

Maybe the 8048?
Click to expand...
IIRC, basic stuff like the crystal connections are different on
MSC-48. Same with the (rather popular for a time) 8085. AFAIR, no
pin-compatibility between families.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
"petrus bitbyter" <p.kralt@reducespamforchello.nl> schreef in bericht
news:diGUd.58097$Pj6.5653@amsnews02.chello.com...
"Marc Geyskens" <emgee@village.uunet.be> schreef in bericht
news:tk91219mv9uqa1s7aerks6vcg7h4a4os8t@4ax.com...
Does anybody here know of an Intel micro controller with a pin out
equal to the MCS-51 series but a bit different ?
No type numbers, manufactured by Intel and Siemens.
The most obvious difference I found is the external address pin is
active H instead of L with MCS-51.
The controller is broken, I'm trying to replace it with a 80C31, so
far no luck, code seems to execute from EPROM but watchdog keeps
resetting, so there are more differences.
Any help appreciated.

mg

Have been rumours at the time that Intel produced custom-made 8048 and
8051
micros with slightly modified pinout or functions. Ever saw documentation
of
one that was supposed to do DES. (Not for sale outside the US, so a
student
of mine programmed a 8751 for the job on hand). Another one was specially
programmed for reading barcodes. Although they were told to be different,
I
never checked for differences between those mask programmed types and
blanks. Did not need to.
Click to expand...
HP still sells custom marked 8051s to handle optical encoders.
 
Does anybody here know of an Intel micro controller with a pin out
equal to the MCS-51 series but a bit different ?
No type numbers, manufactured by Intel and Siemens.
The most obvious difference I found is the external address pin is
active H instead of L with MCS-51.
The controller is broken, I'm trying to replace it with a 80C31, so
far no luck, code seems to execute from EPROM but watchdog keeps
resetting, so there are more differences.
Any help appreciated.

mg

Maybe the 8048?
Click to expand...
the 8031 was also a popular microcontroller in the 80s.
 
8085 was used in many things, including the Tandy model 100 portable, which
at one time I ran a BBS on. :)
How many BBS's can run for a week on four AA batteries?
 
Well, for now I used a controller from a board that's beyond salvage.
Will try sometime to look if the EPROM contains MCS-51 machine code,
work from there.
Greetings,

mg
 
"Marc Geyskens" <emgee@village.uunet.be> schreef in bericht
news:tk91219mv9uqa1s7aerks6vcg7h4a4os8t@4ax.com...
Does anybody here know of an Intel micro controller with a pin out
equal to the MCS-51 series but a bit different ?
No type numbers, manufactured by Intel and Siemens.
The most obvious difference I found is the external address pin is
active H instead of L with MCS-51.
The controller is broken, I'm trying to replace it with a 80C31, so
far no luck, code seems to execute from EPROM but watchdog keeps
resetting, so there are more differences.
Any help appreciated.

mg
Click to expand...
Maybe the 8048?
 
"Marc Geyskens" <emgee@village.uunet.be> schreef in bericht
news:tk91219mv9uqa1s7aerks6vcg7h4a4os8t@4ax.com...
Does anybody here know of an Intel micro controller with a pin out
equal to the MCS-51 series but a bit different ?
No type numbers, manufactured by Intel and Siemens.
The most obvious difference I found is the external address pin is
active H instead of L with MCS-51.
The controller is broken, I'm trying to replace it with a 80C31, so
far no luck, code seems to execute from EPROM but watchdog keeps
resetting, so there are more differences.
Any help appreciated.

mg
Click to expand...
Have been rumours at the time that Intel produced custom-made 8048 and 8051
micros with slightly modified pinout or functions. Ever saw documentation of
one that was supposed to do DES. (Not for sale outside the US, so a student
of mine programmed a 8751 for the job on hand). Another one was specially
programmed for reading barcodes. Although they were told to be different, I
never checked for differences between those mask programmed types and
blanks. Did not need to.

As you have the code in EPROM you may disassemble it to look whether or not
the code makes sense for either 8051 or 8048. (The latter is not very likely
as the pinout of both differs significantly.) Sometimes adresslines,
datalines or both are exchanged. Check your PCB for it.

petrus bitbyter
 
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