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Terry Yager
March 20th, 2004, 03:11 PM
I dug up a couple of 12MHz '286s (PLCC) and a '386/'387 pair (16MHz, pre-DX type, no math error (double-sigma marking)). If someone wants these they can have for cost of postage (couple bucks).

--T

CP/M User
March 20th, 2004, 11:11 PM
"Terry Yager" wrote:

> I dug up a couple of 12MHz '286s (PLCC)
> and a '386/'387 pair (16MHz, pre-DX type,
> no math error (double-sigma marking)).
> If someone wants these they can have for
> cost of postage (couple bucks).

Do those 386/387 chips come with a manual?

I've got a 386 16Mhz based Desktop here
with Maths Co-processor, but I'm not sure
if I need it or what. The second problem
is this machine (is a DEC Workstation 316SX
& is VERY fussy about what hardware it likes),
still it has a slot for the Maths Co-Processor.

How'll we work out the posting complications?

Cheers,
CP/M User.

Terry Yager
March 21st, 2004, 07:01 AM
"Terry Yager" wrote:

> I dug up a couple of 12MHz '286s (PLCC)
> and a '386/'387 pair (16MHz, pre-DX type,
> no math error (double-sigma marking)).
> If someone wants these they can have for
> cost of postage (couple bucks).

Do those 386/387 chips come with a manual?

I've got a 386 16Mhz based Desktop here
with Maths Co-processor, but I'm not sure
if I need it or what. The second problem
is this machine (is a DEC Workstation 316SX
& is VERY fussy about what hardware it likes),
still it has a slot for the Maths Co-Processor.

How'll we work out the posting complications?

Cheers,
CP/M User.

Nope, no manual, but you should be able to d/l it from the web somewhere. The chips I have probably won't help you anyways. Your DEC workstation 316SX is most likely an SX processor, right? The chips I have would be considered DX chips, except they were made before Intel started calling them that. (The original '386s were just called 80386, until the '386SX came along, then they started to call 'em '386DX to distinguish between the two types of chip). The DX chip is a 32-bit processor with a 32-bit wide I/O path, where the SX is a scaled down (cheaper) version with only a 16-bit data path. The two are not generally interchangable, although I have seen boards with the SX soldered-in on the board, and an extra socket for upgrading to a DX type.

--T

CP/M User
March 21st, 2004, 12:18 PM
"Terry Yager" wrote:

>> I've got a 386 16Mhz based Desktop here
>> with Maths Co-processor, but I'm not sure
>> if I need it or what. The second problem
>> is this machine (is a DEC Workstation 316SX
>> & is VERY fussy about what hardware it likes),
>> still it has a slot for the Maths Co-Processor.

> ...The chips I have probably won't help you
> anyways. Your DEC workstation 316SX is
> most likely an SX processor, right?

Yes it is a SX processor. Sorry, I thought you
mean't they were SX chips (when you called
them pre-DX chips). In that case it won't work.
My DEC Workstation looks to have a special
CPU in itself, when I originally got that machine
it was so odd it had a special floppy disk drive
of it's own (which I stuffed up). I kept it in case
I could get it working with some standard
hardware, which I managed to do (so in a sense
I've stopped playing around with it, in case I
muck it up again).

> The chips I have would be considered DX
> chips, except they were made before Intel
> started calling them that. (The original '386s
> were just called 80386, until the '386SX
> came along, then they started to call 'em
> '386DX to distinguish between the two types
> of chip).

Oh okay, I was familiar with these chips which
didn't have the DX on them (just 386-16Mhz &
386-20Mhz I believe they made), I didn't
realise they were the equivalent of the later
DX chips.

> The DX chip is a 32-bit processor with a
> 32-bit wide I/O path, where the SX is a
> scaled down (cheaper) version with only
> a 16-bit data path.

Yes, I knew that.

> The two are not generally interchangable,
> although I have seen boards with the SX
> soldered-in on the board, and an extra
> socket for upgrading to a DX type.

I've got a computer like that, it's a 386 DX
I think running at 40Mhz. The CPU is
soldered onto the board. On the processor
they went to the trouble of stamping a
Windows 3.1 on it! ;-)

Cheers,
CP/M User.

CP/M User
March 21st, 2004, 12:21 PM
"CP/M User" wrote:

>> The two are not generally interchangable,
>> although I have seen boards with the SX
>> soldered-in on the board, and an extra
>> socket for upgrading to a DX type.

> I've got a computer like that, it's a 386 DX
> I think running at 40Mhz. The CPU is
> soldered onto the board. On the processor
> they went to the trouble of stamping a
> Windows 3.1 on it! ;-)

IIRC, this was a compaq based computer.
Reason I can't quite remember is I've
had it stored away for quite some time &
I don't have the original case for it, the
person who gave it to me had broken the
case, fortunately the internals were intact!

Cheers,
CP/M User.