Dobbertin Harddisc

Dobbertin Logo

A harddisc manufactured by the German company Dobbertin.

One of the first ways to connect a Harddisc to the CPC. The Dobbertin harddisc has a capacity of 20 MB. The disc was partitioned in four partitions of 5152 KB each. It was delivered with drivers for CP/M(2.2 and CP/M+) and allows up to 512 directory entries for each partition (including date and time stamps under CP/M Plus).

Reviewed in Amstrad Computer User.

• Dobbertin 20 Mb Harddisc
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  Dobbertin 20 Mb Harddisc

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  Dobbertin 20 Mb Harddisc interface

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  Interface Top

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  Interface Bottom

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  Interface PCB Top

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  Interface PCB Bottom

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  Inside 1

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  Inside 2

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  Inside 3: PSU

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  Inside 4: XT controller

• Dobbertin HD Interface Driver Disc
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  Driver disc side A

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  Driver disc side B

• Dobbertin HD Interface Driver disc (zipped .DSK files)

• Cosmos
• Dobbertin CP/M Plus
• FutureOS using all four partitions (I, J, K and L)
• Prowort via using Dobbertin CP/M Plus (partitions D, E, F and G)
• X-DDOS (v2.10)

• In addition a lot of (cracked) games are able to run from the HD-20 hard disc

Uses XD-DOS v2.10 (which supports the harddisc, and additionally supports external double sided 80track disc drives). The 20 MB harddisc is split into four partitions, with drive names D, E, F, and G (drive name C isn't used here, but may be used as RAM disc, in combination with Dobbertin RAM expansion). Under FutureOS the four partitions are named I, J, K and L. The hard disc is contolled by this I/O Ports:

 #FBE0  Dobbertin Harddisc Data Port
 #FBE1  Dobbertin Harddisc Status, Reset
 #FBE2  Dobbertin Harddisc Select, Configuration
 #FBE3  Dobbertin Harddisc DMA, Interrupt
 #FBE4  Dobbertin Harddisc Reset

Commands (incomplete list):

CMD_TESTREADY   0x00     test drive ready
CMD_RECALIBRATE 0x01     recalibrate drive
CMD_SENSE       0x03     request sense
CMD_FORMATDRV   0x04    format drive
CMD_VERIFY      0x05     read verify
CMD_FORMATTRK   0x06     format track
CMD_FORMATBAD   0x07     format bad track
CMD_READ        0x08     read
CMD_WRITE       0x0A     write
CMD_SEEK        0x0B     seek

• Vortex Winchester Drive (MFM)

Modern:

• CPC-IDE (IDE)
• HDCPC (IDE)
• IDE8255 (IDE)
• SYMBiFACE II (IDE)

• Controller: Seagate ST11M XT-controler.
• Harddisc: 20 MB (3.5" Seagate, NEC, Kyocera, or Miniscribe)
• X-DDOS 2.10 (selectable in ROM bank 1-7)
• 4 Partitions of 5152 KB (5 MB) (accessible as Drive D: to G:)
• 512 Directory entries per partition
• support for CP/M 2.2 with 63K TPA (requires 128 KB RAM), and for CP/M Plus
• support for Softwareclock and TIMEROM+ (Real Time Clock under CP/M Plus)
• Price: DM 1100.-

• Dobbertin Festplatte
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