Difference between revisions of "Dobbertin Harddisc"

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[[Image:Dobbertin.gif|thumb|Dobbertin Logo]]
 
[[Image:Dobbertin.gif|thumb|Dobbertin Logo]]
  
−
A harddisc manufactured by the German company [[Dobbertin]].
+
A harddisc manufactured by the German company [[Dobbertin|Dobbertin Industrie-Elektronik]].
  
 
One of the first ways to connect a Harddisc to the CPC.
 
One of the first ways to connect a Harddisc to the CPC.
 +
 
The Dobbertin harddisc has a capacity of 20 MB.
 
The Dobbertin harddisc has a capacity of 20 MB.
 +
 
The disc was partitioned in four partitions of 5152 KB each.
 
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).
+
 
 +
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).
 +
 
 +
It's even possible to boot CP/M Plus from the hard disc.
  
 
Reviewed in [[Amstrad Computer User]].
 
Reviewed in [[Amstrad Computer User]].
Line 14: Line 19:
 
<gallery caption="Dobbertin 20 Mb Harddisc">
 
<gallery caption="Dobbertin 20 Mb Harddisc">
  
−
Image:Dobbertin 20 Mb Harddisc.JPG|Dobbertin 20 Mb Harddisc
 
−
Image:Dobbertin 20 Mb Harddisc interface.JPG|Dobbertin 20 Mb Harddisc interface
 
 
Image:DobbertinHDInterface_Top.jpg|Interface Top
 
Image:DobbertinHDInterface_Top.jpg|Interface Top
 
Image:DobbertinHDInterface_Bottom.jpg|Interface Bottom
 
Image:DobbertinHDInterface_Bottom.jpg|Interface Bottom
 
Image:DobbertinHDInterface_PCB_Top.jpg|Interface PCB Top
 
Image:DobbertinHDInterface_PCB_Top.jpg|Interface PCB Top
 
Image:DobbertinHDInterface_PCB_Bottom.jpg|Interface PCB Bottom
 
Image:DobbertinHDInterface_PCB_Bottom.jpg|Interface PCB Bottom
 +
Image:Dobbertin 20 Mb Harddisc.JPG|Dobbertin 20 Mb Harddisc
 +
Image:Dobbertin 20 Mb Harddisc interface.JPG|Dobbertin 20 Mb Harddisc interface
 
Image:Dobbertin 20 Mb Harddisc inside 1.JPG|Inside 1
 
Image:Dobbertin 20 Mb Harddisc inside 1.JPG|Inside 1
 
Image:Dobbertin 20 Mb Harddisc inside 2.JPG|Inside 2
 
Image:Dobbertin 20 Mb Harddisc inside 2.JPG|Inside 2
 
Image:Dobbertin 20 Mb Harddisc inside 3.JPG|Inside 3: PSU
 
Image:Dobbertin 20 Mb Harddisc inside 3.JPG|Inside 3: PSU
 
Image:Dobbertin 20 Mb Harddisc inside 4.JPG|Inside 4: XT controller
 
Image:Dobbertin 20 Mb Harddisc inside 4.JPG|Inside 4: XT controller
 +
 +
</gallery>
 +
 +
<gallery caption="Thanks to Jose Leandro - Interface PCB Layouts">
 +
 +
Image:Interface PCB Front.png|Interface PCB Front
 +
Image:Interface PCB Front.JPG|Interface PCB Front
 +
Image:Interface PCB Back.png|Interface PCB Back
 +
Image:Interface PCB Back.JPG|Interface PCB Back
 +
Image:Interface PCB Layout.jpg|Interface PCB Layout
 +
 +
</gallery>
 +
 +
<gallery caption="Thanks to Jose Leandro - Internal PCB Layouts">
 +
 +
Image:Internal PCB Front.png|Internal PCB Front
 +
Image:Internal PCB Front.JPG|Internal PCB Front
 +
Image:Internal PCB Back.png|Internal PCB Back
 +
Image:Internal PCB Back.JPG|Internal PCB Back
 +
Image:Internal PCB Layout.png|Internal PCB Layout
  
 
</gallery>
 
</gallery>
Line 35: Line 60:
  
 
</gallery>
 
</gallery>
−
<br>
 
−
* [[Media:DobbertinHDInterface_Disk.zip|Dobbertin HD Interface Driver disc]] (zipped .DSK files)
 
  
 
== Software using the Dobbertin Harddrive  ==
 
== Software using the Dobbertin Harddrive  ==
  
 
*[[Cosmos]]
 
*[[Cosmos]]
−
*Dobbertin CP/M Plus
+
*[[On File]]
 +
*Dobbertin CP/M 2.2 (63 KB TPA) and CP/M Plus
 
*[[FutureOS|FutureOS]] using all four partitions (I, J, K and L)
 
*[[FutureOS|FutureOS]] using all four partitions (I, J, K and L)
 +
*[[Maxam_2|MAXAM II]]
 
*[[Prowort]] via using Dobbertin CP/M Plus (partitions D, E, F and G)
 
*[[Prowort]] via using Dobbertin CP/M Plus (partitions D, E, F and G)
 
*[[X-DDOS|X-DDOS]] (v2.10)
 
*[[X-DDOS|X-DDOS]] (v2.10)
−
 
+
*[[Z3Plus]] and [[NZ-COM]] (providing hundreds of additional applications)
−
* In addition a lot of (cracked) games are able to run from the HD-20 hard disc
+
*'-HD20BackUp' to backup / compare / restore the complete 20 MB hard disc
 +
*In addition a lot of (cracked) games are able to run from the HD-20 hard disc
  
 
== Technical ==
 
== Technical ==
  
−
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:
+
Dobbertin HD20 is a hard disk that has an interface that appears to implement the SASI protocol (Shugart Associates System Interface).
−
   #FBE0  Dobbertin Harddisc Data Port
+
 
−
   #FBE1  Dobbertin Harddisc Status, Reset
+
(A precursor to the SCSI) but which has registers which look similar to those of the OMTI 5510.
−
   #FBE2  Dobbertin Harddisc Select, Configuration
+
 
−
   #FBE3  Dobbertin Harddisc DMA, Interrupt
+
(The SASI protocol is also used by the SA1000).
−
   #FBE4  Dobbertin Harddisc Reset
+
 
 +
The controller is a Seagate ST-11M.
 +
 
 +
There is an expansion port interface which connects to the CPC.
 +
 
 +
It contains a 16KB ROM containing [[X-DDOS]] which is normally in slot 6 but can be configured between 1 and 7.
 +
 
 +
There is a CPC interface which connects to a PC-XT interface.
 +
 
 +
The OMTI 5510 appears to be very close in terms of operation and commands, but the Dobbertin is probably not this.
 +
 
 +
The command descriptions and operation appear to be the same although the software seems to only use TEST READY, READ, WRITE, SEEK (parking), SET PARAMETERS and FORMAT.
 +
 
 +
Uses [[X-DDOS]] v2.10 (which supports the 20 MB hard-disc, and additionally supports external double sided 80 track disc drives).
 +
 
 +
The 20 MB hard-disc 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. They can be accessed at the same time, so all 20 MB are usable at the same time.
 +
 
 +
The hard disc is controlled by this I/O Ports:
 +
 
 +
   #FBE0  Dobbertin Harddisc Data Port (read/write)
 +
   #FBE1  Dobbertin Harddisc Status (read), Reset (write)
 +
   #FBE2  Dobbertin Harddisc Select (write), Configuration (read)
 +
   #FBE3  Dobbertin Harddisc DMA, Interrupt (Used on CPC???)
 +
   #FBE4-FBE7 Dobbertin Harddisc Reset (read or write will reset)
 +
 
 +
 
 +
Port decoding:
 +
 
 +
A15-A10, A8-A7 are decoded by U11.
 +
A4,A3 from U9B.
 +
A9 is G1, A2 = A, A5 = B, A6 = C into U10
 +
A1,A0 are used when I/O range FBE0-FBE3.
 +
R/W are used.
 +
Data is used by device.
 +
 
 +
FBE0-FBE3 are decoded as ‭111110111110000rr
 +
 +
R/W not used, so read and write will access this port. Data is not important.
 +
 
 +
FBE4 is decoded as ‭111110111110001xx
 +
 
 +
Therefore FBE4-FBE7 access the same port.
 +
 
 +
There is additional port decoding which appears to force bus value with some I/O reads, interrupt request, rom read and ram read. The purpose is not clear.
 +
 
 +
The hard drive interface is an PC-XT compatible hard disc interface.
 +
 
 +
The CPC's port mappings are close to the PC-XT's port mappings.
 +
 
 +
To format the hard disk you need to use the CPM based system tools.
 +
 
 +
To use the tools you need to patch a CPM+ disc so that it recognises the hard disk.
 +
 
 +
* CPM/AMSDOS format
 +
* 512 bytes per sector (possibly defined with jumpers)
 +
* 17 sectors per cylinder (possibly defined with jumpers)
 +
* &E5 format filler byte
 +
* 4 heads (maybe configured by X-DDOS)
 +
* 614 cylinders (maybe configured by X-DDOS)
 +
 
 +
TFM's comment:
 +
 
 +
For FutureOS I researched this hard-disc and I found 17 sectors of 512 bytes per track.
 +
 
 +
It has four heads and 615 cylinders.
 +
 
 +
For optimum speed the sectors and tracks have to be read / written in a defined sequence to reach maximum data transfer speed (about 80 kb/sec).
 +
 
 +
It's not the case that number of sectors, heads, tracks etc. can be redefined (neither software, nor jumpers).
 +
 
 +
These are real hardware values!
 +
 
 +
== Emulation ==
 +
The Dobbertin HD20 is emulated by the Symbiface III since 7/2023. Therefore you need a subfolder 'HD20' on the USB stick. It needs to contain the 21 MB hard-disc image file.
  
−
Commands (incomplete list):
+
It is also [https://www.cpcwiki.eu/forum/emulators/got-bored-again/ emulated in MAME since 6/2015]
−
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
+
  
 
== Other harddisc solutions for the CPC ==
 
== Other harddisc solutions for the CPC ==
Line 74: Line 165:
  
 
Modern:
 
Modern:
−
 
+
* [[Albireo]] (SD card)
 
* [[CPC-IDE]] (IDE)
 
* [[CPC-IDE]] (IDE)
 
* [[HDCPC]] (IDE)
 
* [[HDCPC]] (IDE)
 
* [[IDE8255]] (IDE)
 
* [[IDE8255]] (IDE)
 +
* [[M4 Board]] (SD card)
 
* [[SYMBiFACE II]] (IDE)
 
* [[SYMBiFACE II]] (IDE)
 +
* [[SYMBiFACE III]] (USB, SD card)
 +
* [[X-MASS]] (IDE)
  
 
== Promo (summary) (english) ==
 
== Promo (summary) (english) ==
Line 89: Line 183:
 
* support for CP/M 2.2 with 63K TPA (requires 128 KB RAM), and for CP/M Plus
 
* 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)
 
* support for Softwareclock and TIMEROM+ (Real Time Clock under CP/M Plus)
−
* Price: DM 1100.-
+
* Price: DM 1100.- (approx. 562 Euros)
  
−
== Promo (german) ==
+
== Promo (German) ==
  
 
<gallery caption="Dobbertin Festplatte">
 
<gallery caption="Dobbertin Festplatte">
 +
 
Image:Dobbertin festplatte page1.jpg|Frontpage
 
Image:Dobbertin festplatte page1.jpg|Frontpage
 
Image:Dobbertin festplatte page2.jpg|Contents
 
Image:Dobbertin festplatte page2.jpg|Contents
 +
 
</gallery>
 
</gallery>
  
−
[[Category:Peripherals]][[Category:DATA Storage]]
+
== Downloads ==
 +
 
 +
* [[Media:Layouts on Eagle.zip|Layouts on Eagle.zip]]
 +
* [[Media:GALs.zip|GALs.zip]]
 +
* [[Media:DobbertinHDInterface_Disk.zip|Dobbertin HD Interface Driver disc.zip]]
 +
 
 +
== Links ==
 +
 
 +
* ftp://ftp.seagate.com/techsuppt/controllers/st11m-r.txt
 +
* http://hardware.speccy.org/temp/Amstrad-DiscoDuro.html
 +
* http://heathkit.garlanger.com/companies/ShugartAssociates/sasi_r0a.pdf
 +
* WD1002-SHD datasheet (fewer commands, similar to commands used by Dobbertin)
 +
* http://bitsavers.trailing-edge.com/pdf/sms/pc/OMTI_5510_Winchester_Controller_Jun85.pdf (more commands, similar to Dobbertin in registers and commands)
 +
* https://www.lo-tech.co.uk/w/index.php?title=Seagate_ST11M_Installation_Guide&oldid=480
 +
 
 +
[[Category:DATA Storage]] [[Category:FutureOS]] [[Category:Peripherals]]

Latest revision as of 13:55, 7 June 2024

Dobbertin Logo

A harddisc manufactured by the German company Dobbertin Industrie-Elektronik.

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).

It's even possible to boot CP/M Plus from the hard disc.

Reviewed in Amstrad Computer User.

Pictures

  • Dobbertin 20 Mb Harddisc

  • Interface Top

  • Interface Bottom

  • Interface PCB Top

  • Interface PCB Bottom

  • Dobbertin 20 Mb Harddisc

  • Dobbertin 20 Mb Harddisc interface

  • Inside 1

  • Inside 2

  • Inside 3: PSU

  • Inside 4: XT controller

  • Thanks to Jose Leandro - Interface PCB Layouts

  • Interface PCB Front

  • Interface PCB Front

  • Interface PCB Back

  • Interface PCB Back

  • Interface PCB Layout

  • Thanks to Jose Leandro - Internal PCB Layouts

  • Internal PCB Front

  • Internal PCB Front

  • Internal PCB Back

  • Internal PCB Back

  • Internal PCB Layout

Disc

  • Dobbertin HD Interface Driver Disc

  • Driver disc side A

  • Driver disc side B

Software using the Dobbertin Harddrive

  • Cosmos
  • On File
  • Dobbertin CP/M 2.2 (63 KB TPA) and CP/M Plus
  • FutureOS using all four partitions (I, J, K and L)
  • MAXAM II
  • Prowort via using Dobbertin CP/M Plus (partitions D, E, F and G)
  • X-DDOS (v2.10)
  • Z3Plus and NZ-COM (providing hundreds of additional applications)
  • '-HD20BackUp' to backup / compare / restore the complete 20 MB hard disc
  • In addition a lot of (cracked) games are able to run from the HD-20 hard disc

Technical

Dobbertin HD20 is a hard disk that has an interface that appears to implement the SASI protocol (Shugart Associates System Interface).

(A precursor to the SCSI) but which has registers which look similar to those of the OMTI 5510.

(The SASI protocol is also used by the SA1000).

The controller is a Seagate ST-11M.

There is an expansion port interface which connects to the CPC.

It contains a 16KB ROM containing X-DDOS which is normally in slot 6 but can be configured between 1 and 7.

There is a CPC interface which connects to a PC-XT interface.

The OMTI 5510 appears to be very close in terms of operation and commands, but the Dobbertin is probably not this.

The command descriptions and operation appear to be the same although the software seems to only use TEST READY, READ, WRITE, SEEK (parking), SET PARAMETERS and FORMAT.

Uses X-DDOS v2.10 (which supports the 20 MB hard-disc, and additionally supports external double sided 80 track disc drives).

The 20 MB hard-disc 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. They can be accessed at the same time, so all 20 MB are usable at the same time.

The hard disc is controlled by this I/O Ports: 

 #FBE0  Dobbertin Harddisc Data Port (read/write)
 #FBE1  Dobbertin Harddisc Status (read), Reset (write)
 #FBE2  Dobbertin Harddisc Select (write), Configuration (read)
 #FBE3  Dobbertin Harddisc DMA, Interrupt (Used on CPC???)
 #FBE4-FBE7  Dobbertin Harddisc Reset (read or write will reset)


Port decoding: 

A15-A10, A8-A7 are decoded by U11. 
A4,A3 from U9B.
A9 is G1, A2 = A, A5 = B, A6 = C into U10
A1,A0 are used when I/O range FBE0-FBE3.
R/W are used.
Data is used by device.

FBE0-FBE3 are decoded as ‭111110111110000rr

R/W not used, so read and write will access this port. Data is not important.

FBE4 is decoded as ‭111110111110001xx

Therefore FBE4-FBE7 access the same port.

There is additional port decoding which appears to force bus value with some I/O reads, interrupt request, rom read and ram read. The purpose is not clear.

The hard drive interface is an PC-XT compatible hard disc interface.

The CPC's port mappings are close to the PC-XT's port mappings.

To format the hard disk you need to use the CPM based system tools.

To use the tools you need to patch a CPM+ disc so that it recognises the hard disk.

  • CPM/AMSDOS format
  • 512 bytes per sector (possibly defined with jumpers)
  • 17 sectors per cylinder (possibly defined with jumpers)
  • &E5 format filler byte
  • 4 heads (maybe configured by X-DDOS)
  • 614 cylinders (maybe configured by X-DDOS)

TFM's comment:

For FutureOS I researched this hard-disc and I found 17 sectors of 512 bytes per track.

It has four heads and 615 cylinders.

For optimum speed the sectors and tracks have to be read / written in a defined sequence to reach maximum data transfer speed (about 80 kb/sec).

It's not the case that number of sectors, heads, tracks etc. can be redefined (neither software, nor jumpers).

These are real hardware values!

Emulation

The Dobbertin HD20 is emulated by the Symbiface III since 7/2023. Therefore you need a subfolder 'HD20' on the USB stick. It needs to contain the 21 MB hard-disc image file.

It is also emulated in MAME since 6/2015

Other harddisc solutions for the CPC

Modern:

Promo (summary) (english)

  • 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.- (approx. 562 Euros)

Promo (German)

  • Dobbertin Festplatte

  • Frontpage

  • Contents

Downloads

Links

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