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
• 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:

Gallery of work that was done:

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Download:

• Acorn BBC Master Compact ROM (1008)
• TurboMMC ROM (989)
• TurboMMC 128MB MMC Image (Win32DiskImager format) (1088)