The Workbench

Re: Which processor will replace the BM7000 original ????

Die_Bogener — Sat, 08 Jan 2011 04:16:54 GMT

Beware: a 80c32x2 is a real 80c32, but it will not work. There are some extensions of these processors, which will not work.

I had several BM7000 for repair, "repaired" with the "x2" version. They worked some hours or some days without any problem, suddenly they stopped operation. And started to work after disconecting power. And a very, very short range for the ir communication, max 1 meter and no communication with the BL7000.

Strange? No, it's a timing problem. The x2 starts with a different opcode set, it is faster and B&O made a wrong initialisation of the status register, writing a byte in the register instead of setting status bits . So communication fails... because of a wrong bit, the x2 is twice the speed.

The x2 is still available and very cheap and easy to get. Not a bad chip, it's just much faster...

Re: Which processor will replace the BM7000 original ????

tournedos — Fri, 07 Jan 2011 16:58:14 GMT

It doesn't matter. An 80C32 is an 80C32, regardless of when it was made. The chip will probably have a four-digit date code printed, for example "9247" would be week 47 in 1992.

Re: Which processor will replace the BM7000 original ????

nitro2 — Fri, 07 Jan 2011 16:47:30 GMT

Thanks for this in-depth explanation.

i will have a look if i can find procduction date info somewere.

nitro2

Re: Which processor will replace the BM7000 original ????

tournedos — Fri, 07 Jan 2011 12:24:23 GMT

The CMOS (with the C in the middle) and NMOS (without) parts are totally interchangeable as long as software goes. Manufacturer doesn't matter either.

One difference is that the power saving modes of the CMOS controller are not implemented in the NMOS version. This doesn't matter if the original design uses an NMOS part.

The reset pin works differently, but again, it doesn't usually matter when putting a C part in place of an NMOS chip. It could be a problem, since B&O's reset circuits are often more or less silly (or too clever, depending on how you want to look at it) and don't follow the chip manufacturers' application notes.

The on-chip clock oscillator differs as well, but it won't matter in this case.

The internal architecture of I/O pins differs between these two versions, but contrary to regular CMOS logic, the 80Cxx will accept TTL logic levels directly, so that won't prevent direct replacement either.

Finally, a xx32 will work in place of a xx31, but not the other way round (8032 has more on-chip memory and peripherals).

***

What you should stay away from are the further developed versions of the basic 31/32/51/52 controller. They are usually only made by one manufacturer, may require chip specific initialization, and the faster versions may have different instruction timings, which will definitely break any code that uses software timing loops.

That's the list of differences, but can I guarantee that you can replace the original 8032 with a 80C32? Unfortunately not, but I strongly suspect it will work without problems

PS. The "1980" will be simply Intel's copyright date on the original design, not the date of chip manufacture, or you have managed to find a really old batch.

PS/2. For completeness: the xx51/52 contain on-chip ROM with the program code, which has been mask programmed already during the chip manufacturing process. These chips will therefore be application specific, and it's impossible to replace them with anything but an original spare part chip - or a very expensive EPROM version of the controller, but then you'd need to get the program code from somewhere as well.

Re: Which processor will replace the BM7000 original ????

nitro2 — Fri, 07 Jan 2011 10:57:21 GMT

Let's hope the 80c32 will work .................

as they are very hard to get i have recieved 2 , after along search......................and they don't come cheap .

nitro2

Re: Which processor will replace the BM7000 original ????

Dillen — Fri, 07 Jan 2011 07:26:11 GMT

I am not sure about the CMOS versions. I seem to remember
something about the remote control not working properly but
it was many years ago and I may remember wrong.

Anyways, I have a little stock of SAB 8032A-16-P
and SAB 8032B-16-P (both Siemens) if everything else fails.

Martin

Re: Which processor will replace the BM7000 original ????

nitro2 — Fri, 24 Dec 2010 05:10:21 GMT

And ,....................ordered !!

indeed very hard to get :-(

nitro2

Re: Which processor will replace the BM7000 original ????

nitro2 — Thu, 23 Dec 2010 11:20:25 GMT

danke ,

thanks ,

i will order the original ( intel 80c32 ) from 1980

Re: Which processor will replace the BM7000 original ????

Die_Bogener — Thu, 23 Dec 2010 10:31:24 GMT

Yes, the Intel 80c32 is ok, also Philips and Siemens. They all work perfect... B&O used the Philips version.

Important is, that it is a real 80C32 and not something like a Atmel 80c32x2.

Which processor will replace the BM7000 original ????

nitro2 — Thu, 23 Dec 2010 09:04:25 GMT

Is the 1980 intel 80c32 usable as a direkt replacement ????

all help is help

nitro2