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CGA color fix for Olivetti M24SP

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    CGA color fix for Olivetti M24SP


    I faced the following problem with my Olivetti M24SP: in text mode (mode bw80 and mode co80) light gray looks like low blue.
    this results in unreadable texts in some programs can anyone help me with this? I'm using the original Olivetti CGA Card and monochrome monitor.

    VirtualBox_DOS_04_08_2016_12_20_42.jpg WP_20160804_12_16_41_Pro.jpg

    First own PC in 2003: AMD K6-2 500MHz, 320MB RAM, 40GB IBM HDD, 50x CD-ROM, 8x4x24 CD/RW, 100MBit LAN, 32MB ATi Rage 128 Pro, Windows XP

    CGA_COMP shows lines at dark blue...
    Attached Files

    First own PC in 2003: AMD K6-2 500MHz, 320MB RAM, 40GB IBM HDD, 50x CD-ROM, 8x4x24 CD/RW, 100MBit LAN, 32MB ATi Rage 128 Pro, Windows XP


      The 'blue' attribute on a CGA corresponds to 'underlined' on an MDA. The M24 has a second mode select register at 03DEh, and when bit 6 of this register is set, characters with a blue foreground colour appear as white underlined characters.


        So, theres no fault in my hardware, just incompatibility to the original CGA? Is there a way to override that?
        Last edited by freakedenough; August 5, 2016, 12:18 AM.

        First own PC in 2003: AMD K6-2 500MHz, 320MB RAM, 40GB IBM HDD, 50x CD-ROM, 8x4x24 CD/RW, 100MBit LAN, 32MB ATi Rage 128 Pro, Windows XP


          It sounds like the sort of setting that could be changed either by motherboard DIP switches, or by some sort of DOS utility. But I don't know the M24 well enough to know if either of those facilities has been provided.


            There is no jumper or switch to change anything in this direction:
            Meanwhile I've created a CGA-VGA adapter to get an 8-color-mode (CGA without intensity) on my flat TV. Foreground (text) blue is white and underlined text.

            Here I've selected blue as foreground (text) color and black as background color:

            If i would have selected blue foreground and light gray background you wouldn't be able to read anything > both seem to be white

            Here I've selected light gray as foreground (text) color and blue as background color:

            I hope someone who also has an Olivetti M24 can help me with this.
            Last edited by freakedenough; August 17, 2016, 01:08 PM.

            First own PC in 2003: AMD K6-2 500MHz, 320MB RAM, 40GB IBM HDD, 50x CD-ROM, 8x4x24 CD/RW, 100MBit LAN, 32MB ATi Rage 128 Pro, Windows XP



              First own PC in 2003: AMD K6-2 500MHz, 320MB RAM, 40GB IBM HDD, 50x CD-ROM, 8x4x24 CD/RW, 100MBit LAN, 32MB ATi Rage 128 Pro, Windows XP


                Back when I used an M24 with a monochrome monitor (mine was the AT&T 6300 variant), I avoided the problem entirely by running MODE BW80 before running any program that couldn't reconfigure its color set.

                However, I don't remember running into that problem very much; in fact, running MODE CO80 usually made everything display properly as shades of gray. Are you using AT&T MS-DOS 2.11 or 3.x, or some generic MS-DOS version? If the generic version, your MODE command might not be aware of the M24's display hardware.
                Offering a bounty for:
                - A working Sanyo MBC-775 or Logabax 1600
                - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)


                  fix described here:

                  First own PC in 2003: AMD K6-2 500MHz, 320MB RAM, 40GB IBM HDD, 50x CD-ROM, 8x4x24 CD/RW, 100MBit LAN, 32MB ATi Rage 128 Pro, Windows XP