joe.herdler-/
2014-02-02 20:01:44 UTC
Hi All,
Here is a question that has stumped me. I am attempting to design an
old-school 8086 computer using various manuals and data sheets. I have run
into one issue that read though I may, have not doped out. That is the BHE
signal from the 8086 and co-processors. According to Osborn, the BHE lines
should be connected between the 8089 and 8086. should that same line be
connected to the BHE line on the 8087, with all three processors in
parallel? Next, I know that the BHE line needs to be latched along with the
Address lines (A0-A19). I also know that the last of the three 8282 latches
that are used for the top 4 address lines is used for this purpose. What
pin should I use to latch this BHE signal? Pin one, with output on pin 19?
I know that I am no computer designer, though I really would like to be.
Any help on this would be quite appreciated. By the way, I am calling this
the "Definitely Old School Intel Machine" (DOSIM for short).
Best,
Joe
Here is a question that has stumped me. I am attempting to design an
old-school 8086 computer using various manuals and data sheets. I have run
into one issue that read though I may, have not doped out. That is the BHE
signal from the 8086 and co-processors. According to Osborn, the BHE lines
should be connected between the 8089 and 8086. should that same line be
connected to the BHE line on the 8087, with all three processors in
parallel? Next, I know that the BHE line needs to be latched along with the
Address lines (A0-A19). I also know that the last of the three 8282 latches
that are used for the top 4 address lines is used for this purpose. What
pin should I use to latch this BHE signal? Pin one, with output on pin 19?
I know that I am no computer designer, though I really would like to be.
Any help on this would be quite appreciated. By the way, I am calling this
the "Definitely Old School Intel Machine" (DOSIM for short).
Best,
Joe
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