Re: High Speed CD-ROM drives

["Jason Whorton" <jason at microxl.com>]

"Joel" <joelbuckley54.nospam.@hotmail.com> wrote in message
6CudnQjCSZYCXSugXTWcow@comcast.com">news:6CudnQjCSZYCXSugXTWcow@comcast.com...
> David Empson wrote:
> > At the very least, you won't get full performance out of a CD-ROM drive
> > faster than 1x, due to the limited throughput of the Apple II SCSI
> > cards.  The original SCSI card can't even sustain the throughput
> > required for 1x, but the high-speed SCSI card might be able to manage 2x
> > (under GS/OS).
>
> I saw dramatic improvement over the 1X drive.
> In testing, a CD-600 is 4.5X as fast a CD-150.
>
> I have a CD-150, CD-300,and CD-600 drive and did a little testing.
> This is a ROM 01 GS (no accelerator)., and HS SCSI card.
> Rev C SCSI should be about the same as HS SCSI with no DMA.
> I was surprised that the CD-600 was faster than my hard drive.
>
> These are times for an 8200 block verify under GSOS 6.01
> This is without DMA, should be comparable to Rev C SCSI.
> (Speed) Drive  -  No DMA Time  - Calc Speed
> (1X) CD-150  - 70s  - 60kB/s
> (2X) CD-300  - 55s  - 76kB/s
> (4X) CD-600  - 53s  -  79kB/s
> 2GB hard drive 64k block - 480s  - 70kB/s
>
> These are times for a 65535 block verify under GSOS 6.01
> This is with DMA.
> (Speed) Drive  -  DMA Time  - Calc Speed
> (1X) CD-150  - 362s  - 93kB/s
> (2X) CD-300  - 103s  - 326kB/s
> (4X) CD-600  - 80s  -  420kB/s
> 2GB hard drive 64k block - 120s  - 280kB/s
>
> The difference is quite noticeable.
> That's why I was looking for a driver to support the extra functions on
the
> CD-600.
> I didn't want to go back to the CD-150.
>
> Besides, the missing CD-audio functions, the only difference I've noticed
is
> no OA-E eject.
> (You have to push the button.)
> I think one of the faqs talked about having to reboot on a change of CDs.
> I have NOT seen that.
>
> Joel

Hello.  Thank you both for sharing your information.  It is appreciated.

Thank you,
Jason Whorton