Previous Thread
Next Thread
Print Thread
Page 9 of 18 1 2 7 8 9 10 11 17 18
rfka01 #101008 08/06/15 02:24 AM
Joined: Jan 2012
Posts: 853
C
Senior Member
Offline
Senior Member
C
Joined: Jan 2012
Posts: 853
So I get this written to a port:
Code:
SIEMENS 80186 SINIX

COPYRIGHT (c) 1984 BY SIEMENS AG

Size of free memory = 830 Kbyte

Computername: sie001, Version: 1.2, Release: 25.Feb.1987


Unfortunately it's the wrong port and worse it's the video controller config port. At least it's booting.

rfka01 #101016 08/06/15 08:27 PM
Joined: Jan 2012
Posts: 1,129
Likes: 1
rfka01 Offline OP
Very Senior Member
OP Offline
Very Senior Member
Joined: Jan 2012
Posts: 1,129
Likes: 1
Wow! Great progress, thanks!


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
rfka01 #101017 08/06/15 08:30 PM
Joined: Mar 2001
Posts: 16,715
Likes: 11
R
Very Senior Member
Online Content
Very Senior Member
R
Joined: Mar 2001
Posts: 16,715
Likes: 11
Maybe the MMU remaps the I/O space in addition to memory?

rfka01 #101224 08/20/15 02:28 AM
Joined: Jan 2012
Posts: 853
C
Senior Member
Offline
Senior Member
C
Joined: Jan 2012
Posts: 853

So this is the best I can do for now. It's not remapping because it starts in the bootloader before the MMU is even enabled. My only guess is that the graphics board on the PC-X is different from the one in the PC-D. If you look at the pictures that rfka01 posted of the PC-X the graphics board has an 8031 which the PC-D has an 8047. It also has an extra ROM chip. Maybe the 8031 presents a terminal like interface and can write directly to the VRAM and the extra ROM is a character ROM instead of RAM (the tech manual says this is an option).

rfka01 #101225 08/20/15 06:32 AM
Joined: Jan 2012
Posts: 1,129
Likes: 1
rfka01 Offline OP
Very Senior Member
OP Offline
Very Senior Member
Joined: Jan 2012
Posts: 1,129
Likes: 1
It's alive smile ... that's the main thing! Once again, thanks ... chances are good I'll get BIOS files from a real PC-X some time during autumn, I am sure your work now is a great basis for that.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
rfka01 #101230 08/20/15 07:50 PM
Joined: Jan 2012
Posts: 853
C
Senior Member
Offline
Senior Member
C
Joined: Jan 2012
Posts: 853
I'd be surprised if the BIOS ROMs are different as the PC-D ones have the MMU tests. The graphics ROMs are the ones of real interest for me.

rfka01 #101361 08/29/15 10:27 PM
Joined: Jan 2012
Posts: 1,129
Likes: 1
rfka01 Offline OP
Very Senior Member
OP Offline
Very Senior Member
Joined: Jan 2012
Posts: 1,129
Likes: 1
Axel, who I've been in contact with about the PC-X, documented the disassembly of his machine and put the ROMs online:

http://www.geekdot.com/siemens-pc-x/

Thanks to another contributor!


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
rfka01 #101362 08/29/15 10:36 PM
Joined: Mar 2001
Posts: 16,715
Likes: 11
R
Very Senior Member
Online Content
Very Senior Member
R
Joined: Mar 2001
Posts: 16,715
Likes: 11
Awesome!

rfka01 #101533 09/09/15 01:47 PM
Joined: Jan 2012
Posts: 853
C
Senior Member
Offline
Senior Member
C
Joined: Jan 2012
Posts: 853
Got it.

Need to figure out how the attributes select the line drawing characters.

Edit:

Last edited by crazyc; 09/09/15 05:26 PM.
rfka01 #101535 09/09/15 02:17 PM
Joined: Mar 2001
Posts: 16,715
Likes: 11
R
Very Senior Member
Online Content
Very Senior Member
R
Joined: Mar 2001
Posts: 16,715
Likes: 11
Ooh, nice smile

Page 9 of 18 1 2 7 8 9 10 11 17 18

Link Copied to Clipboard
Who's Online Now
3 members (Pernod, R. Belmont, 1 invisible), 34 guests, and 3 robots.
Key: Admin, Global Mod, Mod
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Forum Statistics
Forums9
Topics8,919
Posts117,179
Members4,989
Most Online890
Jan 17th, 2020
Forum Host
These forums are hosted by www.retrogamesformac.com
Forum hosted by www.retrogamesformac.com