At 10:26 AM 6/30/98 +0200, you wrote:
>> David is right, you only measure the number of interrupts that got >>
through.
>> For example, take two equally fast disk ROMs, ROM A re-enables interrupts
>> whenever possible and ROM B keeps interrupts disabled during the whole
>> disk
>> I/O. According to your test, ROM B would be much faster, but in fact it
>> isn't.
>
>Well, it really is... The sound that the drive makes (when it changes
track >or
>something?) can be heard very clearly, and in the fast diskROM-case, it can
>clearly be heared that it loads faster. At the boot-sequence of the Sony,
>it's
>also clear that the fast one is really faster, because the booting of the
>SOny
>with the fast diskROM goes about twice as fast! The slow-one waits very
>long
>after the 'drive-test'...
My example was only intended to illustrate why your BASIC test program is
not good. It doesn't say anything about your actual MSX machines.
>But, as Erik suggests, the Version Number 1.2 is a fake? There's no real
>1.2?
I guess so, but I cannot verify it.
Some comparisons:
NMS8250: Disk BASIC 1.0
Turbo R GT with "1" key pressed: Disk BASIC 1.0
>To conclude: there MUST have been 'surgery' in that Sony with fast diskROM?
Very likely, because Sony replacement disk ROMs where told for many years
by clubs and MSX hardware companies.
>There really exist disk ROM's on MSX with _caching_?? Didn't know that....
DOS2 does some caching: the bootsector, the FAT and the directory.
>> Another good test: use a sector copier (one that uses the disk ROM, so
>> don't choose FastCopy!) and take a stopwatch to time how long a disk copy
>> takes.
>
>Which one do you suggest? (BTW: and where can I download it?)
No idea, I'm sorry. I haven't used sector copiers for years. But most
sector copy programs use the disk ROM. Generally speaking: if the program
works on all MSX types without running a special installation program, it
uses the disk ROM.
Bye,
Maarten
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