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Siemens PC-D #96883 11/09/14 04:19 PM
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Intro:

The Siemens PC-D is another examples of the machines created in the transitional period of the mid 80s, when the final verdict on the future PC architecture had not yet been passed, and several manufacturers entered the market with their own interpretation of what a PC should look like.
The PC-D differs in some ways from IBM's machines and their clones, and so only specially modified software can be run. Siemens ensured that a lot of important software of the day could be executed - there were ports of MS-DOS, MS Word, MS Windows and some applications, DR GEM, Turbo Pascal and others.
The PC-D was also sold as a Unix workstation running Siemens' Sinix under the PC-X moniker.

Most of this stuff is already posted in the "Requirements" thread, but I've since redumped the BIOS and HD controller ROMS, and it's sorted and cross-linked.



The main differences between the PCD and regular PC clones are:

- 80186 CPU
- proprietary bus with horizontally stacked cards
- non-compatible graphics using the SCN2674 video chip that is also used in MAME's MPU4Video driver
- black and white graphics 640x350
- SCSI on board using Siemens' SM912 SCSI chip, the harddisk is then connected via an Omti 5100 SCSI <=> ST506 controller board
- WD 2791 Floppy disk controller (2793 according to Servicehandbuch p.27)
- Two V24/V11 serial interfaces
- RTC MC146818
- 720KB on 5,25" floppy disks (9 sectors, 80 tracks, 2 sides), ability to read 360K floppies. Later developments by Siemens aficionados extended this to 1.2MB HD disk support.
- 256KB, 512KB or 1024KB RAM with ca. 800KB available to user programs due to the non-IBM-architecture.
- (Part of) the BIOS is contained in the MS-DOS, every DOS version has a BIOS version as well.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Siemens PC-D [Re: rfka01] #96884 11/09/14 04:20 PM
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Documentation:

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D%20Servicehandbuecher.zip

https://dl.dropboxusercontent.com/u/5541...0Anhang%202.rar

The documentation is in German, but I have translated important parts here:

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/PCD%20translated.pdf

Pages quoted in the following posts are relative to the PDF files, not to the pagination of the original documents.

If specific information is needed, I can hunt for it smile


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Siemens PC-D [Re: rfka01] #96885 11/09/14 04:22 PM
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Mainboard:

The BIOS dumps of the PC-D mainboard and the harddisk controller are identical between the two PC-D's I own, I have included the second archive here for completeness' sake.

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/Siemens%20PCD%20%231.rar

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/Siemens%20PCD%20%232.rar

Mainboard layout: Servicehandbuch Teil 1, p.9, p.70ff, p.184ff (=> PCD translated p.18ff)

RAM: Servicehandbuch Teil 1, p.188f (PCD translated p.22)

Physical location of connectors: Servicehandbuch Teil 1, p.35

Bus pinout: Servicehandbuch Teil 1, p.78f, p.195ff

DMA Channel properties: Praxisbuch, p. 4

Interrupt controller: Servicehandbuch Teil 1, p.27

Interrupt table: Praxisbuch, p.11f, Servicehandbuch Teil 1, p.222

Memory map: Praxisbuch, p.10, Servicehandbuch Teil 1, p.209 (=> PCD translated p.23)

RTC: Servicehandbuch Teil 1, p.193

Speaker: Servicehandbuch Teil 1, p.194

LED error display: Servicehandbuch Teil 1, p.2ff (=> PCD translated p.1f); p.62

Self test, function of RESET and DEBUG switches in the front panel: Servicehandbuch Teil 1, p.61 (=> PCD translated p.3), p.190f

Internal ROM monitor: Servicehandbuch Teil 1, p.66 (=> PCD translated p.6)

Serial ports: Servicehandbuch Teil 1, p.201


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Re: Siemens PC-D [Re: rfka01] #96886 11/09/14 04:23 PM
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rfka01 Offline OP
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Keyboard, Mouse and Video:

The keyboard is attached via a V11 serial interface and contains its own EPROM, it also houses the beeper.

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/PC-D%20Keyboard.rar

Praxisbuch, p.9f, Servicehandbuch Teil 1, p.172ff (=> PCD translated p.14ff)

The display is controlled by the SCN2674 chip with 32KB of Display RAM
Servicehandbuch Teil 1, p.160 (PCD translated p.8)

Video memory map: Servicehandbuch Teil 1, p.162f, p.164ff (=> PCD translated p.10ff)

There's an Alpha mode and a Graphics mode: Servicehandbuch Teil 1, p.160

An 8041A on the Graphics card acts as a mouse controller: Servicehandbuch Teil 1, p.161 (=> PCD translated p.9f)

The dumps of the 8741AD's ROM are contained in the main archives of the "Mainboard" post"

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/scn2674_548307.pdf

Graphics Video: Servicehandbuch Teil 1, p.31, p.157 (PCD translated p.7), p.159,

Pinout of the Monitor (it's a BAS signal!) and Mouse Connector: Servicehandbuch Teil 1, p.83, p.141


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Siemens PC-D [Re: rfka01] #96887 11/09/14 04:24 PM
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rfka01 Offline OP
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Floppies and Harddisks, Software:

Floppy Controller: Servicehandbuch Teil 1, p.211

Harddisk Error codes: Servicehandbuch Teil 1, p.5

Floppy drive jumper settings: Servicehandbuch Teil 1, p.117f

SCSI port: Servicehandbuch Teil 1, p.218ff

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/OMTI_5x00.pdf

Harddisk: BASF 6188 (360-4-18), Servicehandbuch Teil 1, p.29 or NEC D5126 (615-4-18), p.30; Servicehandbuch Teil 1, p.124

Harddisk controller: Servicehandbuch Teil 1, p.215ff

Some floppy images for testing:
https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/Siemens%20PC-D%20disks.rar

Boot process: Servicehandbuch Teil 1, p.64f (=> PCD translated p.4f)


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Siemens PC-D [Re: rfka01] #96899 11/10/14 04:08 PM
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Thank you. Do you have any info about the I/O ports it uses? The manual talks about a "Geräte-Steuer-Register" for example, but no info to be found.

Re: Siemens PC-D [Re: rfka01] #96903 11/10/14 06:07 PM
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rfka01 Offline OP
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There is a table in the Praxisbuch, p.12f that I've translated:

https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/PCD%20Translated%202.pdf

Are you looking for the addresses marked as HW in that table?


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Siemens PC-D [Re: rfka01] #96904 11/10/14 06:22 PM
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I don't think Duke needs any translations wink

Re: Siemens PC-D [Re: rfka01] #96905 11/10/14 06:24 PM
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Those are just the memory addresses used by the BIOS. For example, the WD2793 seems to use I/O addresses 0xf900 to 0xf907 (+ possible mirrors).

Re: Siemens PC-D [Re: rfka01] #96906 11/10/14 06:39 PM
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rfka01 Offline OP
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@judge ... maybe others do wink
@Duke gotcha ... unfortunately I haven't spotted a handy compilation yet.



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