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PRES A3K6 Disc Buffer v2 with A3K12 DFS (top)
PRES A3K6 Disc Buffer v2 with A3K12 DFS (back)
PRES A3K6 Disc Buffer v2 with A3K12 DFS (bottom)
The PRES A3K6 Disc Buffer was one of a range of PRES upgrades for the Acorn A3000. It allowed a 5.25" disc drive to be added to the Acorn A3000. It fits inside the A3000 and allows the PRES 1MHz bus and user port to be fitted. The external 5.25" disc drive is attached to the 36 pin socket on the back. The A3K6 was supplied with on board firmware for assigning drive letters and 40/80 stepping. The board is marked "DISC BUFFER V2 1989 (c) BE".
The PRES A3K12 is a ROM and disc upgrade for the A3K6 (I don't have the disc). The ROM is an ARM 1770 DFS, for use with the RISC OS !65Host, allowing 5.25" DFS discs to be read on the A3000. It fits in the ROM socket on the A3K6 replacing the A3K6 firmware. The A3K12 also included DFS Filer which was a desktop application allowing DFS files to be dragged from a view to an ADFS viewer or application, providing an easy way to migrate DFS files to ADFS.
Here are the PRES A3K6 Instructions.
PRES A3K6 Disc Buffer v3 (top)
PRES A3K6 Disc Buffer v3 (back)
PRES A3K6 Disc Buffer v3 (bottom)
The PRES A3K6 Disc Buffer v3 differs from the v2 with the additon of 4 links which can be set to improve compatability the floppy disc drives, the links can be seen the top view above. This example still has the A3K6 firmware ROM.
Here is the PRES A3K6 Disc Buffer v3 addendum .