koziarzw@LONEX.RADC.AF.MIL (Walter Koziarz) (07/19/89)
Well, continued tampering with PC-DOS 3.2 (attempts to 'graft' its [equivalent] MSDOS.SYS and COMMAND.COM to Z-100 IO.SYS) have lead me to conclude that this is possible; but in the realm of: "Why bother????". I saw no tangible benefit other than satisfying curiosity as to the 'machine-independence' of MSDOS.SYS and COMMAND.COM. Most commands DID work and the system booted, ran WatchWord and other Z-100-specific applications. The 10MHz clock-rate tinker seems (from my fractal-image oriented perspective) to be much more worth pursuing. The only real question I am still uncertain of with regard to 10MHz is whether the PALs on the 8087 board can keep-up. More to follow as I proceed. Walt K.
krvw@sei.cmu.edu (Kenneth Van Wyk) (07/19/89)
In article Follow-up to Z-100 tinkering of 19 Jul 89 11:50:07 GMT koziarzw@LONEX.RADC.AF.MIL (Walter Koziarz) writes: >The 10MHz clock-rate tinker seems (from my fractal-image oriented perspective) >to be much more worth pursuing. The only real question I am still uncertain >of with regard to 10MHz is whether the PALs on the 8087 board can keep-up. Another serious consideration here is the 8087 itself, which is particularly prone to heat (hence speed) related problems. When I increased the speed on my 100 from 5 to 8 Mhz, I found that the machine would lock up at odd times, unpredictably. I put in an 8088-2 (8 Mhz model) and that improved the situation slightly, then I put in an 8087-2 (when the prices were ~$100) and voila - no more lockups, ever. The PALs, while probably not rated for 8 Mhz operation, had no problem whatsoever. My H-100 continues to run at 8 Mhz with 100% reliability (knock on wood...). Ken Kenneth R. van Wyk Technical Coordinator, Computer Emergency Response Team Software Engineering Institute Carnegie Mellon University Internet: <krvw@SEI.CMU.EDU>