codeman
Experienced Member
I got this Osborne Vixen in a pile of Kaypro stuff , Was really hoping it was working but, this was all i got .
So i tore it all down and got out the scope and started looking around.
There are some schematics on archive.org but i believe there are for the prototype.
Chip numbers and pins used are different on this production unit.
But the basic design is the same .
Found out the 7406 in A7 was bad video going in and nothing coming out.
Once i replaced it .
Video looked great now just need to make a boot disk and see how it all works .
Also disassembled some of the bios and there are some IO routines in the 0xF0-0xFF range
and they are not internal to the Vixen so as a guess it would be for the Hard Drive .
ken
So i tore it all down and got out the scope and started looking around.
There are some schematics on archive.org but i believe there are for the prototype.
Chip numbers and pins used are different on this production unit.
But the basic design is the same .
Found out the 7406 in A7 was bad video going in and nothing coming out.
Once i replaced it .
Video looked great now just need to make a boot disk and see how it all works .
Also disassembled some of the bios and there are some IO routines in the 0xF0-0xFF range
and they are not internal to the Vixen so as a guess it would be for the Hard Drive .
ken