General info

There are two known versions for the board (chips listed left to right topdown):
version 1
  • symbios logic 53CF96-2 (narrow SCSI HBA);
  • a pair of Toshiba TC558128AJ-15 (15ns 128Kx8 CMOS static RAM);
  • a pair of ALS245A (buffers);
  • Lattice pLSI1016 (PLCC);
  • LSI KL5C80A16CF (Z80 instruction compatible microcontroller);
  • Atmel AT27C256R-70RC (70ns 32Kx8 CMOS EPROM).
version 2
  • symbios logic 53CF96-2 (narrow SCSI HBA);
  • a pair of SEC KM681001BJ-15 (15ns 128Kx8 CMOS static RAM);
  • a pair of ALS245A (buffers);
  • LSI KL5C80A16CF (Z80 instruction compatible microcontroller);
  • Atmel AT27C256R-70RC (70ns 32Kx8 CMOS EPROM);
  • Lattice pLSI1016 (PLCC).

The DIP switches

DIP switches

Left to right:
0dunno
1dunno
2dunno
3SCSI bus termination
4SCSI bus termination
5SCSI target bit 2
6SCSI target bit 1
7SCSI target bit 0

IDE drive geometry

as far as i can tell the board only understands drives with maximum of 15 heads and 63 sectors per track. the cylinder number is limited to 16384. the controller does not honour the total number of sectors on the drive that limits the total capacity to a little bit less than 8G.
drives with more than 15 heads seem to allow the device to probe but fail to accomplish any actual data transfers resulting in controller timeouts. that sounds like an overflow and thus division by zero on the board's controller (;

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