Re: Speaking of PCMCIA..

2001-10-17 Thread PeterH5322 


In a message dated 10/17/01 1:32:16 PM, [EMAIL PROTECTED] writes:

<<
> An UW-SCSI port is 16-bits-wide, and is, consequently, capable of faster
> aggregate transfers.
> 
> Certainly 20 to 40 MB/sec, unless it is forced into 8-bits-wide mode by the
> device.

OK, Can you do this on a PB 520? I have a PPC board and a card cage.
>>

A 520, 520c, 540 and 540c all share the same motherboard, on which is mounted 
everything except the processor, processor RAM, modem, and country-specific 
DAA (modem to telco adapter, AKA Data Access Arrangement).

Therefore, yes, you may install an UW-SCSI PCMCIA card in your 520 and get 
UW-SCSI performance out of it.

As you have a PPC upgrade board, your PCMCIA card cage must be a Rev. C.

If you want to retain the 68K processor, then a Rev. B card cage would work.

I retain one 5xx machine which is 68K, and which has a Rev. B card cage.

I have several 540cs which have been upgraded to PPC, and for which I have 
bought a Rev. C card cage.

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Re: Speaking of PCMCIA..

2001-10-17 Thread Donna Hood Pointer 

OK, Can you do this on a PB 520? I have a PPC board and a card cage.
Donna Pointer-- iMac, ergo iAm


> Re: Speaking of PCMCIA..
> 
> 
> In a message dated 10/17/01 9:11:44 AM, [EMAIL PROTECTED] writes:
> 
> <<
> Please elaborate on the ultra wide scsi. What kind of a card does this (on a
> 520) and how much does it cost? How much faster speed does ultra wide give
> you, or is it a matter of being able to use more current devices?
>>> 
> 
> The 520/540/550's external SCSI port is limited to 5 MB/sec. This is often
> referred to as Narrow SCSI.
> 
> There is a variant of this 8-bits-wide SCSI called Fast SCSI. This is used
> internally in the 7500 and other similar Macs.
> 
> This is 10 MB/sec.
> 
> But, on machines so equipped, the external SCSI port is still 5 MB/sec.
> 
> And, this external port is on a separate SCSI bus controller chip on many
> Macs.
> 
> An UW-SCSI port is 16-bits-wide, and is, consequently, capable of faster
> aggregate transfers.
> 
> Certainly 20 to 40 MB/sec, unless it is forced into 8-bits-wide mode by the
> device.
> 
> There is a 160 MB/sec variation.
> 
> I believe the PCMCIA UW-SCSI cards are from Adaptec, but there could be
> others.
> 
> Most servers use UW-SCSI.
> 
> Current LVD (low voltage differential) SCSI drives are generally compatible
> with single-ended SCSI, such as Narrow, Fast, and UW-SCSI.


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Re: Speaking of PCMCIA..

2001-10-17 Thread PeterH5322 


In a message dated 10/17/01 9:11:44 AM, [EMAIL PROTECTED] writes:

<<
Please elaborate on the ultra wide scsi. What kind of a card does this (on a 
520) and how much does it cost? How much faster speed does ultra wide give 
you, or is it a matter of being able to use more current devices?
>>

The 520/540/550's external SCSI port is limited to 5 MB/sec. This is often 
referred to as Narrow SCSI.

There is a variant of this 8-bits-wide SCSI called Fast SCSI. This is used 
internally in the 7500 and other similar Macs.

This is 10 MB/sec.

But, on machines so equipped, the external SCSI port is still 5 MB/sec.

And, this external port is on a separate SCSI bus controller chip on many 
Macs.

An UW-SCSI port is 16-bits-wide, and is, consequently, capable of faster 
aggregate transfers.

Certainly 20 to 40 MB/sec, unless it is forced into 8-bits-wide mode by the 
device.

There is a 160 MB/sec variation.

I believe the PCMCIA UW-SCSI cards are from Adaptec, but there could be 
others.

Most servers use UW-SCSI.

Current LVD (low voltage differential) SCSI drives are generally compatible 
with single-ended SCSI, such as Narrow, Fast, and UW-SCSI.

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Re: Speaking of PCMCIA..

2001-10-17 Thread Donna Hood Pointer 

Please elaborate on the ultra wide scsi. What kind of a card does this (on a
520) and how much does it cost? How much faster speed does ultra wide give
you, or is it a matter of being able to use more current devices?
Donna Pointer-- iMac, ergo iAm

> 1-besides being able to use a faster modem card than
> my built in GV 19K modem and being able to read
> compact flash cards, what other useful things can you
> do with a PCMCIA card?
>>> 
> 
> UW-SCSI,
> 
> 100/10 Ethernet,


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Re: Speaking of PCMCIA...

2001-10-16 Thread Remy Davison 

>1-besides being able to use a faster modem card than
>my built in GV 19K modem and being able to read
>compact flash cards, what other useful things can you
>do with a PCMCIA card?
>>>
>
>UW-SCSI,
>
>100/10 Ethernet,
>
>among others.
Don't forget Airport - not Apple's card, but Farallon's and Lucent's work 
on the PB500 series - they're PCMCIA.

Cheers,

RD

Remy Davison
Contributing Editor, Insanely-Great Mac 
mail: <[EMAIL PROTECTED]>
RD's PowerBook page: 



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Re: Speaking of PCMCIA...

2001-10-16 Thread victoria 

Hi i got a rev b for my 540c and it works fine with my pcmcia 56k pc card 
pcmcia modem no other software needed set it as a generic pc card modem and
away you go .


Victoria

--
>From: Don Silver <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]> (PowerBooks)
>Subject: Speaking of PCMCIA...
>Date: Tue, Oct 16, 2001, 10:38 pm
>

> Hi listers,
>
> Recent posts about PCMCIA's have got me thinking of
> getting one for my PB 540 (don't have or want the PPC
> upgrade, so don't need the "diamond encrusted" :->
> rev. C). Three questions:
> 1-besides being able to use a faster modem card than
> my built in GV 19K modem and being able to read
> compact flash cards, what other useful things can you
> do with a PCMCIA card?
> 2-do you need separate software to enable the PB 500
> to see the card, or does it just show up on the
> desktop?
> 3-Would I have trouble finding non-PPC modem software
> for a modem card?
>
> cheers,
> Don Silver
>
>
> =
>
>
> __
> Do You Yahoo!?
> Make a great connection at Yahoo! Personals.
> http://personals.yahoo.com
>
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Re: Speaking of PCMCIA...

2001-10-16 Thread PeterH5322 


In a message dated 10/16/01 2:38:55 PM, [EMAIL PROTECTED] writes:

<<
1-besides being able to use a faster modem card than
my built in GV 19K modem and being able to read
compact flash cards, what other useful things can you
do with a PCMCIA card?
>>

UW-SCSI,

100/10 Ethernet,

among others.

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