bennety@tektronix.UUCP (Bennet Yee) (05/12/84)
A friend of mine asked to have his question posted on the net.
If anyone has any information, please mail me. I don't read news as
often as I'd like, so please send directly instead of posting. My
address is
...!{decvax,zehntel}!tektronix!bennet!bennety
I will forward the information. Thanks.
Bennet Yee
...!tektronix!bennet!bennety
Question:
----------
According to Radio Shack and an article in Byte Magazine,
March 1984, page 306 (West Coast Edition) the Model 2000 has
an empty socket for an Intel 80187. Nobdy seems to know
anything about this chip - even the Intel Data Books list
the 8087 and the 80287 but not the 80187. Can anyone tell
me if there is such a chip - certainly Radio Shack would
tell people if an 8087 would work in that socket, but no -
their position is that it is an 80187 slot and is not
available yet, but will be available someday. When??
----------hsplab@ecsvax.UUCP (05/21/84)
[] According to some very sketchy Intel documentation, the 8087 does work with the 80186/80188, but because of differences in the bus timing, requires the use of the 82188 interface chip to "complete HOLD/HLDA bus protocol conversion to RQ/GT, synchronizes ready and provides local bus control signals." I asked the representative at the Intel seminar whether there was a hardware reference manual (we were given the programming reference manual which referred to the hardware manual) and his response was that he had not seen one ... it is probably in press. I guess the answer to the question on whether the 8087 will work in the socket provided by Tandy depends on the design. My guess is that Intel will not be coming out with the 80187 if they are providing wiring diagrams with the 8087 in their seminars. D. Chou hsplab@ecsvax
chip@t4test.UUCP (05/24/84)
> From: bennety@tektronix.UUCP (Bennet Yee) > > Nobdy seems to know anything about this chip - even the Intel Data > Books list the 8087 and the 80287 but not the 80187. Can anyone tell > me if there is such a chip > From: hsplab@ecsvax.UUCP > > ...the 8087 does work with the 80186/80188, but because of differences > in the bus timing, requires the use of the 82188 interface chip to > "complete HOLD/HLDA bus protocol conversion to RQ/GT, synchronizes > ready and provides local bus control signals." That is correct... The iAPX186/188 bus was designed so that these parts may use iAPX86/88 peripherals. There are some differences, and as the above article points out, some logic is required to get an 8087 to properly speak to the 80186. Later this year, the 82188 will be available to simplify this interfacing issue. As a result, there is no need for an 80187. The iAPX286 bus architecture is quite different from the iAPX86, and accordingly an 80287 is required for numerics coprocessing. -- Chip Rosenthal, Intel/Santa Clara GNUS: {pur-ee|hplabs|ucbvax!amd70|ogcvax!omsvax}!intelca!t4test!{chip|news} MAYUL: {intelca|icalqa|qubix|idi}!t4test!{chip|news}