IBM PC XT-compatible east german computer, https://sudonull.com/post/113859-Rare-Robotron-EC-1834-computer

• CPU: 4,9152 MHz Intel-8086-compatible CPU K1810 WM86 / 5,25“ floppy (2 sides, each 720kb)
• 256kb RAM + 256kb card
• OS: DCP 3.20 or 3.30, or MUTOS1834, alternatively CP/M-86, DOS or Windows 3.0)
• K5504 20MB harddisk
• ISA cards, no default connector as can be seen here. If desoldering these, one could use these: https://www.buerklin.com/en/p/amp/pcb-connection-systems/6-5530843-5/57F748/?segment=b2c
• K7229.25 monitor, broken?
  • connector: male
  • MCE2HDMI converter, I got that one
  • Or vga to sub9 adapter? Resoldering might be required: https://sudonull.com/post/113859-Rare-Robotron-EC-1834-computer
  • Or sub9 to VBS connection should work, according to https://mastodontech.de/@tagon/110808180911726114 . VBS (Video, Blanking and Syncs) = composite video
  • db9 to db15 cable might be enough: https://www.youtube.com/watch?v=_vh_SnveZVY
  • selfbuild project, converts to HDMI, further rgb2hdmi device, further rgb2hdmi device, CGA2RGBv2 device
• K7033.10 COL graphics card
  • can do 32kHz vertical frequency, 29,58kHz horizontal frequency, 58.4-62.4Hz picture frequency
  • Connector: female
  • maximum resolution - 640×480, CGA- and EGA-compatible
• OPS K3575.10 RAM expansion card
• https://rechenwerk-halle.de/ - Rechenwerk Halle, Rene Meyer

• available here
• https://github.com/hoglet67/RGBtoHDMI
• https://github.com/hoglet67/RGBtoHDMI/wiki – wiki
• https://github.com/hoglet67/RGBtoHDMI/issues/357 - opened this issue
• Potential next steps:
  • use an oszi or a USB uszi to check if the graphics card is handing out a proper signal. With the MCE2HDMI card, I see “something” which changes when I press keys. But no proper sync/picture.
  • replace the graphics card with a known good one (I don't have access to one)
  • strip down cards, check the dip switches position (haven't modified these so far)
  • Post to https://www.robotrontechnik.de/ board