Ever see an Intel 8088AN? That is where a hermetic seal is put over the top of the CPU on the circuitboard. Probably about a half inch all around, and less than 1/8th inch bulge from the PCB plane. I've got two duplicates that are on a SIMM-like board with a ROM chip for some sort of laptop.
You are thinking of the 80186/80188 CPUs. Very rare to find PCs built around them, but some circuit real estate could be regained by using one. For an even smaller form-factor something like an NEC V40 could be used. Had a circuit board from a fax machine (with a little RAM & ROM) that used one.
Whoops, I mean 8088AL. The card is for a Daewoo laptop, and has the name "Wildcard 88-N" silkscreened in script. Probably that is what got me confused.
I mean by hermetic black goop. See attached picture (copyright date is '78, '86). And one of the whole Wildcard assembly too.I was of the persuasion that they all are hermetically sealed. Note I didn't say actually believed (on good authority) they were. Please edumucate me
But this is a version of an Intel 8088 CPU I have seen nowhere else (BTW, Bob Grossblatt's "8088 Project Book" is an excellent reference for this sort of thing). Probably Intel's only foray into this package type, at least for x86. I know that it was common practice with some other manufacturers.
I understand your other, main project is the 8080 (and well documented at that, Thank You for the contributions), but are the picture names you have set up a typo? And why not name them for the V20? What are the 8080 opcodes that the NEC CPUs (V20, V30, V35, V40, V50) are able to emulate if you know?
Mentioned earlier, Robert Grossblatt's "The 8088 Project Book" (ISBN 0-8306-0271-2, or paperback ISBN 0-8306-3171-2) is an excellent reference for putting something like this together. And great humor you won't commonly see from other authors. For not starting from scratch there are cards that have 8088 CPUs from discarded Xerox Memorywriters (which had a monochrome display & diskette drives in a few versions).
Yes, in maximum mode it needs another chip to decode the R/W and other signals.
Here's the scheamtic:
http://kaput.homeunix.org/~thrashbarg/8088.png
It looks complicated, but the chip count is low (5 support chips for the 8080, 4 chips for address decoding, the rest are RAM/ROM and I/O devices).
I got the 8284 clock generator from the XT motherboard I stripped most of the components off. You may need to desolder it, mine was in a socket. If you want to run in maximum mode (it doesn't change the code or speed, just the number of signals available), you'll need to get the 8288 from a motherboard too. The XT runs in maximum mode.
Anything else should be answered in the 8088 datasheet which you can google
Cool, meaning that the V30 (8086 replacement), V40 (80188 replacement), & V50 (80186 replacement) should as well (there is some Z80 PC adapters on eBay that are supposed to make the PC able to run CPM, but if you have an NEC CPU in the system it could do the same?). Getting back to the original thread, I had desoldered a small form-factor V40 from a FAX board, meaning that it should be in stock somewhere or able to be pilaged from a board. This would be an 8-bit CPU (unknown for the minimum/maximum setting) with a few support chips onboard to make it so the OP could do his project.
