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#73585 - 10/09/11 08:19 PM Re: Ericsson Step/One [Re: robcfg]  
Joined: Oct 2011
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Burbas Offline
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Burbas  Offline
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Joined: Oct 2011
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Originally Posted By robcfg
Hi, if you don't find anyone near you, could you consider sending it over registered mail for dumping?

FatArnold sent me the Luxor Slutprov rom, it was succesfully dumped and returned home safely smile


Sounds like a plan :-). PM me your address and I'll send you the roms!

#73997 - 10/31/11 06:11 AM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Aug 2004
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Robbbert Offline
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Robbbert  Offline
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Did anything come of this?

#101587 - 09/15/15 05:24 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Sep 2015
Posts: 7
MattisLind Offline
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MattisLind  Offline
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Joined: Sep 2015
Posts: 7
I found this old thread on Step/One while searching the net.

I have four Step/One in various condition. Mono monitor and colour monitor. 8 inch drives and 5.25 inch drives.

I successfully imaged a number of disks:
Wordstar
Multiplan
MS-pascal
MS-DOS BASIC
Combi/step ovningsdiskett
Combi/step master *
Combi/step original *

The two with stars failed on track four when using IMD. It seems to be unformatted but it might be som copy protection?

Then there were a disk "RJE 3780" that had four bad sectors.

If there are interest I can dump ROMs from them.


#101588 - 09/15/15 05:28 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Mar 2001
Posts: 15,807
R. Belmont Offline
R. Belmont  Offline

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Joined: Mar 2001
Posts: 15,807
USA
Seems to be a not-PC-compatible MS-DOS machine, in which case yes we'd love ROMs and disk images from the Step/One smile

#101589 - 09/15/15 05:46 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Sep 2015
Posts: 7
MattisLind Offline
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MattisLind  Offline
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Joined: Sep 2015
Posts: 7
Sorry. I am new here. Where should I put the stuff?

I can give a link to a google drive / dropbox. But maybe there are better ways?

#101590 - 09/15/15 05:54 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Dec 1999
Posts: 1,169
Justin Offline
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Justin  Offline
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Joined: Dec 1999
Posts: 1,169
Vancouver Island, BC, Canada
Send them as attachments to

#101591 - 09/15/15 07:12 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Sep 2015
Posts: 7
MattisLind Offline
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MattisLind  Offline
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Joined: Sep 2015
Posts: 7
OK. IMD files sent.

I will dump the ROMs in a couple of weeks and send them as well.

#101598 - 09/16/15 09:32 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Dec 1999
Posts: 1,169
Justin Offline
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Justin  Offline
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Joined: Dec 1999
Posts: 1,169
Vancouver Island, BC, Canada
Great, thank you very much for helping the project!

#112078 - 01/07/18 12:25 AM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Aug 2015
Posts: 348
Edstrom Offline
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Edstrom  Offline
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Joined: Aug 2015
Posts: 348
Just found this thread, there is soon a working Step/One driver in MAME, for the next release we have support for 320x200 8 color mode and 640x200 b/w mode right now working on the 640x400 interlaced mode which I hope to add as well. Below is a couple of screen shots. Cred goes also to Mattis for the disk images and Fredrik Öhrström who has written the keyboard driver and provided BIOS dumps.
[Linked Image][Linked Image]

Last edited by Edstrom; 01/07/18 12:29 AM.
#112220 - 01/18/18 02:42 PM Re: Ericsson Step/One [Re: Fake Shemp]  
Joined: Aug 2015
Posts: 348
Edstrom Offline
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Edstrom  Offline
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Joined: Aug 2015
Posts: 348
Finally got the Step/One "feature complete" merged, there was some problems where the service manual was not describing a graphics mode correct, it turned out that the machine indeed supported a high res color mode, aka 640x200 in 8 colors, I got evidence from Weetmuts who owns a physical Ericsson step/one (a branded Mybrain 3000) so I had to figure out how that worked and I found that the hardware uses 8 bits for green and duplicated 4 bits each for red and blue to form the palette index for each pixel. This means that any color involving red or blue will affect at least two pixels in width. Green is ok for single pixel lines however.

Here are some screen shots from some of Weetmuts step/one floppy dumps:
[Linked Image] [Linked Image] [Linked Image]
[Linked Image] [Linked Image] [Linked Image]
[Linked Image] [Linked Image] [Linked Image]

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