IBM Portable PC
Veteran Member
Does anyone know if Ray Holmes is still about?
The Holmes Engineering PCSG (Portable Computer Support Groups) Chipmunk floppy drive controller board schematic would be of interest, as chip numbers have been sanded off all chips except for the 1770 fdc.
If not, can anyone recommend a firm who can deencapsulate and identify ic’s, and perhaps produce a schematic from a pcb, and finally, design a pcb etc?
I may consider launching a crowdfunding project to achieve this.
The Holmes Engineering PCSG (Portable Computer Support Groups) Chipmunk floppy drive controller board schematic would be of interest, as chip numbers have been sanded off all chips except for the 1770 fdc.
If not, can anyone recommend a firm who can deencapsulate and identify ic’s, and perhaps produce a schematic from a pcb, and finally, design a pcb etc?
I may consider launching a crowdfunding project to achieve this.