This is the solder side of IC16, and the track has been cut to connect a different pin. This has the effect of modifying where the host adapter appears in the 1MHz bus memory map. This allows two host adapters to exist at the same time, essentially for using the DigiStore as a local hard disc backup device. It also means, as we shall see, that the ADFS OSWORD call &72 used to communicate with SCSI devices on the 1MHz bus doesn't work.

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