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Lotus PC

68030 Based home computer using once top-of-the-line parts

unicdkunicdk
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3 comments
11 followers
This is the start of what I could consider an advanced computer for the early 90s on a mini-itx board, so it can be housed easily w/a pre-made power supply. My primary focus is to create a very robust, 68k computer (with MMU because secure multi-tasking) then advanced video and audio making it a good platform for gaming.

The current specs are:

* 68030 clocked at 50mhz
* Yamaha V9990 for video
* Yamaha YMF278B (OPL4) with 2MB SRAM and 2MB of ROM for samples
* IDE Bus for mass storage (PIO mode only)
* 512kB flash memory (boot image)
* 4 port USB master controller (Not legacy, but makes interfacing with modern devices easier)
* 5V FPGA (Flex10k) for bus control
* 2 72-pin SIMM connectors (Up to 256mB of memory, no parity)

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Dave wrote 05/20/2017 at 22:14 • point

Any progress?

  Are you sure? yes | no

unicdk wrote 08/27/2015 at 22:17 • point

Sadly, I hit some supply chain issues with some of the parts after I started the routing process for the board.  I'm most likely going to wind up replacing the YM chipset with something else since finding the OPL4 is near impossible to very expensive now.   My new approach will probably be to use the SNES audio hardware (the one chip version) if I ever finish making a breakout board for it.  IT actually frees up a lot of space on my board and makes routing it to a mini-itx form factor much simpler.

  Are you sure? yes | no

Stuart wrote 08/27/2015 at 12:03 • point

Hi!  The spec for your 68030 system is interesting.  I'm building up to a similar project at the moment - currently finishing off a 68010-based system (listed on my project page, if you're interested).  Have you made any progress with your system since you posted your spec?

  Are you sure? yes | no

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