emulatorII-list

Check this link for a catweasel MK4:
   
  http://www.softhut.com/cgi-bin/test/Web_store/web_store.cgi?page=catalog/hardware/accelerators/catweaselmkiv.html&cart_id=6287774_88947
   
  I know that vesalia Computer's out of stock for the moment.
   
  /Marko

hoschi1103 <totti@...> skrev:
          Hi all,

as far as I'm through the code and after some experiments, I'm quite
sure that there must be track numbers on the disk. On loading a bank
from disk, a wrong read in value (not in sequence) after changing a
track leads to a "Disk Read Error" string output.

Overlays have fixed positions on disk, although I couldn't make out
which track holds which overlay or where the list with the positions
comes from.

Currently I'm stuck in simulating the CPUs as I can not emulate the
interaction between the two. My Z80 Sim does only support one CPU.

Very interesting, there is a complete monitor for debugging all
registers and CPU state of the Scanner CPU in the Scanner ROM, but
some of the code for activating it is NOPed out. I didn't dive in it
yet but if I read the code correctly, it was once used via a terminal
on the serial port and activated with a control byte sent to EMU while
one of the control lines was active. In the far future, I might have
an idea on how to reactivate it.

If anybody has dumps of older versions of the ROMs, I would be really
glad if you could send them to me :-)

The Scanner ROM is much more interesting than the Main ROM, as there
are many tricks used in initialising the EMU II memory, including copy
of often used code fragments from ROM to memory for, as I think,
saving disk space for the overlays loaded later... 

And, as I asked before:

DOES ANYBODY HAVE a catweasel MK IV or can arrange a sale?

Greetings,
Hoschi

--- In emulatorII-list@yahoogroups.com, "esynthesist"
<esynthesist@...> wrote:
>
> Hi there,
> 
> The EII formats the floppy disks with 2 sides of 80 tracks, each 
> having 3584 bytes (probably one big sector).
> This is 560K on a disk on which DOS only formatted 360K. 
> It's pretty sure that this massive capacity is only possible by NOT 
> putting physical header/gap zones between sectors (of e.g. 512K) and 
> that may be the reason why a PC can not read them.
> 
> These disks hold both the OS and the soundbank. The 476K of sounddata 
> are written sequentially on the disk immediately after the OS area, 
> and has exactly the same layout as the SoundDesigner for Emulator II 
> files. So if you want this part of the disk, just unload them with SD 
> on a Mac. 
> If you want to get the OS part, you'll need to find a way to read the 
> disks on a PC...
> ...something no one ever succeeded in the last 20 years.
> 
> This is due to this softsectored 3584 byte tracks, which is not a 
> sectorsize known by a PC floppycontroller.
> Another issue may be the rotation speed of the drive, which may be 
> different from a PC's drive (controller command). Although I'm not 
> sure about this, because I haven't heard yet of two different speeds 
> available in 5.25 drives - I think they were all 360rpm. But it's a 
> known problem with some 3.5 drives (e.g. the CASIO FZ series suffers 
> from this problem). Anyway, the Catweasel controller is capable of 
> different speeds, so that may be a solution if the problem really 
> exists. 
> 
> I have also tried to read EII disks on my PC's (with 5.25 drives) but 
> was unsuccessful until now. But I was planning to do some new 
> experiments in the near future... only because of the challenge since 
> SDII is for sure a much better way to keep an archive then reading 
> the floppies !
> 
> Good luck
> 
> ///E-Synthesist
> 



                         

       
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