> Send me the current versions exact schematic ASAP! any CSHOW compatable > format > will be fine:-) ALSO details of the logic states of the fixed lines on the > IDE-bus ie which are pulled high or low and which are left floating as that's > important too! > At worst get a FAX image file using BGFAX and a FAX machine as a scanner > Brian > would probably help out with the FAX machine to use as the scanner:-)
Martin's rebuilding it... hang on a mo :) > In response to imc (I think) you mentioned how ini couldn't be used if the > data port was split into 2 I/O locations.... > Well IF you use A8 to determine which data register then inir would still be > fine as it'll cycle through odd/even etc. PLUS you'd have control over *when* > a word is actually xfered;-) > And of course it'll still fit in a block of eight 8bit I/O addresses. > It would also remove the need for the flip-flop to count the data acceses and > probably make it easily converted to GAL from the PROM design especially if > running from the drive2 slot where the 2 lines /RD & /WR are condensed into > the single WRL/RD line:-) What I'd like to know is who said anything about using a PROM or a GAL? :) We've costed the interfaces -- the one based on your design that Bob's probably using will cost about L18, not including PCBs manufacture, and that's at the 25 unit discount for bulk component buying... Martin's design (yet to be tested, but preliminary results look hopeful), comes to L9, not including PCB manufacture, again at the 25 unit discount price... And that's not using a ROM, PAL or GAL :) > > Oh, and btw: here's a q: what do you think of the partition data, and where > > should the boot sector of the active partition be loaded and called from? > > I had a quick scan through it, though I need to export it and study it > properly as this reader software doesn't expand hard-TABs so it won't line up > until I read it externally.... CPM OLR CRR never had that problem...sigh... Oh well :) > > I was thinking of at &4000, namely because it'd mean the DOS could be > > loaded into external memory ;) > > Even if the boot sector was loaded at or above &8000 you'd still be allowed > to > set LMPR to the same as the current HMPR and jump down low... Amazing what > can > be done in 512bytes of properly size optimised code! > The way the native stuff boots is entirely upto you... To be honest I don't > know enough about the native mode boot operations to advise on a compatable > HD > alterative, I did think about get the ROM disasembly but nevr bothered as I > don't use native mode if I can help it;-) Don't worry about it -- it's pretty flexible (the boot routine must load to 32768, but other than that, anything goes... actually, that 32768 value is just for compatibility with the floppy boot -- something that people will feel comfortable with...) > > Undefined operating systems eg Unix must, by their yet to be designed > character, be booted from an existing operating system eg a CP/M .COM or > native CODE file. I dunnno.... if they follow the BOOT partition details I'm hoping to put down, they should work fine... > The only native software I use is LERM SAMDISK Ver2 to repair the odd > corrupted track and that VERY rarely, Oh and COMET when hacking ProDos source > about but that's only because it's easier bringing up a boot disk from native > mode. *laughs*... well, I'm a big fan of COMET, but there you go... > Are you hacking MasterDos with the aid of Source from Andy or are you hacking > it from your own disasemblies of it? If the latter it might be worth giving > Andy a bell and ask him if you can have a copy of the source for private use > only:-) Andy gave me the DOS source last year to work with, but other stuff (like Uni work) got in the way, so I didn't do anything with it...now that the HD is along, it's full steam ahead, but I wish I knew how MasterBASIC compressed stuff -- ie source code :) > > Welll.... he wants to use LPT2 ... stupid bugger :( > > He certainly aint a Bruce Gordan! Heheheheh... you're right there... Simon ps Jonathan -- let me know your phone number! We neeeeeeeed to talk! (well, in the not too distant future, anyway)
