Are there multiple models of the Intel 8089 IOP?

Question

As far as I'm concerned there is only one model of the Intel 8089 (the D8089A-3). I am not able to find any information on this. While the 8086,8088 and 8087 use the scheme of the last number (-3 in this case) being -2 on 8MHz versions and (seemingly very rare) -1 for 10MHz versions, the -3 for me seems out of place.

Also what clock is it using? I found info about it being 5MHz or 6MHz. But didn't find any 8088 CPU (for example) that used 6MHz.

So is the 8089 just so rare that only this version exists, and where can you find info on different versions? Where there 8MHz versions that would work with the 8088-2 or the 8086-2?

One theory that I have is that this processor simply is capable of running on all clock speeds mentioned here.

Sorry for my English and thanks in advance. I'm asking this cause we're maybe going to build an IAPX-88/21 system on breadboard. (as in the IAPX-88 manual there isn't much info on building a system only with the 8088 and 8087)

Answer 1

[...] scheme of the last number being -2 on 8mhz versions -1 for 10mhz versions [...]

1. They are not versions but speed grades.
2. Versions are donated by letters after the base number.
3. There is no fixed relation between speed grade and grade marker.
4. The number is just to make it being different.
5. What timing goes with what grade is to be looked up at the data sheets.
6. No suffix simply means base grade

Also what clock is it using? i found info about it being 5mhz or 6mhz. But didn't find any 8088 cpu (for example) that used 6mhz.

There is no relation between the speed grade suffixes used for different devices.

One theory that i have is that this processor simply is capable of running on all clock speeds mentioned here.

Rather unlikely. Speed grades develop over time with improved production yield. No device comes at highest speed grade first.

Answer 2

Fujitsu offered the MBL 8089 at 5MHz and the MBL 8089-2 at 8MHz. You can find the datasheet on page 1-256 of their 1987 Microprocessor Data Book. Rather obviously this is just second sourcing – Fujitsu fabricating Intel's design under license.

According to that data sheet, the -C suffix denotes 40-pin ceramic DIP packaging. I also can find references to MBL8089-2-C-G on various spammy electronic components websites, which give me the impression the -G suffix means "gold pins".

Although IBM didn't use it in PCs, it was used in a handful of non-IBM-compatible 8086 systems. Also it looks like the Fujitsu MBL8089 was used by the US military, since MBL8089-2C has NSN 5962-01-332-1187 assigned. (Indeed, one NSN database mentions the US Navy as a user.) Quite possibly it is still in use today in some weapons system.

The Siemens 1985 Industrial Data Book mentions a Siemens version, the SAB 8089, but it doesn't actually contain a datasheet for one. I am left with the impression that while Siemens licensed the 8089 from Intel, they may have never actually manufactured it. One random PDF I found lists the full model number as SAB 8089-D

The defunct "CPUpages.com" website mentions two 6MHz versions from Intel, the 6MHz D8089-3 and the also 6MHz D8089A-3. It appears the D8089-3 is the 1979 original, and the D8089A-3 is a 1985 revision. The Intel part also appears to have seen military use, having been assigned NSN 5962-01-180-8047.