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Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

I found in the box of the rubbish dump two Olivetti Prodest 128S that was given to me long time ago by a dear friend: Andrea Pierdomenico.

Both computers are without the Floppy Drive and Power Supply external module.

I chose one of two in a better conditions and i did a modding to use it with a VGA Monitor and SDCARD instead of Floppy Disk plus some extras.

Work that has been done:

  • Replaced the lame Olivetti ROMS (EPROM 27C512) with the original one from Acorn BBC Master Compact (release MOS 5510)
  • GBS8200 v4.0 for VGA Output installed inside the case.
  • Removed the Input Video signal connector (YPbPr) of the GBS8200 because they cause problems to closing the case.
  • Capacitor FIX for GBS8200 (https://ianstedman.wordpress.com/2015/01/25/gbs-82xx-experiments-part-2/)
  • Installed a Power Switch.
  • Cutted two pcb track for the Power Switch.
  • Installed a VGA Connector.
  • Replaced the Power LED (RED) with a GREEN LED.
  • External power supply (5v / 2.5A).
  • Installed a potentiometer (10K) to adjust the speaker volume.
  • Cutted one pcb track for the potentiometer, otherwise the external volume adjust don’t work.
  • TurboMMC installed (see the pinout for the internal installation).
  • Installed TurboMMC Eprom.

TurboMMC pinout for the internal installation:

Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

Gallery of work that was done:

Download:

  1. Luis
    September 28th, 2018 at 10:02 | #1

    Hi. Is neccesary replace the Olivetti ROM by the Acorn BBC Master Compact ROM?
    I have a Prodest 128S with beebMMC4. The connections are OK. The MMC CARD image seems be OK, beeb.mmb in FAT32 formated card. beeb.mmb is from https://stardot.org.uk/forums/viewtopic.php?f=1&t=12904

    I can’t see de disks.

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