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An ISA card for the DiskOnChip 2000

An ISA card for the DiskOnChip 2000

Describes a home-made ISA interface card for using a DiskOnChip in a desktop PC.
The design is essentially a selectable address decoder. He has made provision for three selectable address ranges using a conventional jumper header. It’s a very simple circuit, using only 2 x 74HC138’s and a single 10k resistor. Total cost, including the board and sockets, was under $10. A very cheap way to get into embedded linux!

Since this was only a prototype, I didn’t really want to layout a PCB and go through the trial and error approach of debugging. My solution was to hack the edge connector off an old I/O card I had available, and bolt that to a prototype board. I then soldered wire-wrap wire from the IC sockets to the edge connector. This is clearly shown in the picture below.

The design is essentially a selectable address decoder. I have made provision for three selectable address ranges using a conventional jumper header. It’s a very simple circuit, using only 2 x 74HC138’s and a single 10k resistor. Total cost, including the board and sockets, was under $10. A very cheap way to get into embedded linux!

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