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shred's Achievements


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  1. There's some background info on the Super-80 here: Super-80 Wikipedia article
  2. The disk system used a WD2793 controller. I had a poke around in some of the source for MESS and found an emulation of the WD17xx controllers, which mentions WD2793, so it might not be that hard to emulate the disk controller. I guess the Microbee disk emulation would be a good start. The Z80 DMA chip associated with the UFDC might be a bit more challenging though. The 2400 baud tape system was designed by a guy called "Terry Nunn" and yes, I think he was from Queensland. My experience with it was similar to your experience with the 3000 baud tape setup. It worked really well and was much more reliable than the original 300 baud tape system.
  3. I've been having a play with the MESS Super-80 emulation. It all seems to run quite well - many thanks Robbert and the others responsible for emulating this machine. I copied my BASIC tape to a wave file and it played straight in - not bad for a 28 year old audio cassette. I also have BASIC in ROM, but the BASIC tape was the only obviously 300 baud oneI had. Most of my tapes were made using a heavily modded 2400 baud tape interface. My machine was modified to run with a floppy drive using an interface made by MCE. Does anyone know how hard it would be for me to write some sort of floppy drive emulation? I converted most disks to images on my PC a few years ago, so I've already crossed that bridge. I have no desire to run CP/M, since I migrated all my Super-80 CP/M software to a CP/M emulator many years ago. I'm interested in running "Super-80 DOS", which was a very primitive track-based operating system. Hopefully, the primitive nature of S80 DOS would make it easier to emulate!
  4. If you are seeing spaces (ASCII value of 32) turn into @ (ASCII value of 64), then try changing the DRAM chip that holds bit 5 of the video memory (I think it's U68 if you only have 16k fitted). If you don't have a spare 4116 floating around, just swap the "bit 5" RAM chip with the "bit 0" chip and see if the space characters start changing into ! characters (ASCII 33). When I first assembled my Super 80, tricky dickies supplied me with a faulty RAM chip, so I found that one out the hard way.
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