Table of Contents for this issue:
Lisa Power Supply Schematics?
Re: Networking E-mail w/AIMS and Mac II?
Re: Mac Plus and HDFD Drive?
Re: Mac Plus Modem?
Re: SE SuperDrive -and- Booting Plus from Maxtor
Re: Can't Boot a Plus from 120MB Maxtor
Re: Plus and Bad Power Supply
Re: NEC CDR36--Need Drivers

Does anybody have or knows where to get schematics and or service manuals
for the two types of Lisa power supplies?

thanks
Robert Zamboni

Date: Mon, 4 Aug 1997 22:01:42 -0500
To: Classic Posts
From: "Charles T. Smith"
Subject: Networking E-mail w/AIMS and Mac II?

Hello all,

I teach in a "mostly" Mac district and we are just getting our middle
school lab (28 LC 580's) hooked up to the net. We already have several
individual machines connected. We have someone who can do the ethernet
cabling, etc. My question concerns an email server. Our current plan
includes purchase of a Wintel machine to do the email serving. I've read
some things lately that lead me to believe that this is foolish. We already
have several Macs around, including an LC, Classic II, Mac II, etc. Can one
of these older machines be set up to be the email server. Alternatively,
should we use one of the 580's?

Do any of you kind people have experience with AIMS or it's Eudora
version/successor EIMS? How much computer power do I really need to serve
mail for 28 machines and 250 students plus staff?

No reason why not. I tested AIMS out on a IIsi once. I didn't see any
problem with it. The only problem would be if the load gets heavy.

Clark Martin

Date: Tue, 5 Aug 1997 12:40:50 -0600 (MDT)
To: Classic Posts
From: "Brian Robson"
Subject: Mac Plus and HDFD Drive?

I'd really appreciate any info. on this!

I have enjoyed and appreciated your http and ftp sites. I have a Plus
and just connected an HDFD floppy drive to it. It only reads 800k disks.
I was told that Apple had a system extension called "HD20" or something
like that which would enable reading of 1.4 disks. Can you shed any light
on this? Is it true? Where could I find this extension? Any info. you could give would be
greatly appreciated!

HD20 allowed a Mac512K access to the HD20 harddisk. This was a, suprise,
20Mb harddisk that connected to the floppy port and had a pass through
connection for an external floppy. It also allowed on to format and use
400K floppies with HFS (Heirarchical Filing System). HFS (which is what is
still used today) has real folders. MFS (Macintosh Filing System) had
folders but all the files were in one real directory and the folders were
just for appearances. It was used prior to the Mac Plus. MFS did not allow
for more than one file with the same name on the disk. HD20's support of
HFS was of course primarily for the HD20 drive. The HD20 drive might never
have seen the light of day if it weren't for Steve Jobs ouster from Apple
in late 1985. It was announced to try and counter bad press over his
ouster. A few months later the Plus was announced which had SCSI and HFS
support in ROM.

HD20 has nothing to do with 1.44Mb floppies which didn't appear until 1987.
Applied engineering had a 1.44Mb floppy drive which would work with the
Plus but it didn't sell much and it was a specialized drive. A Plus can't
work with a standard HDFD drive (except for use with 800K disks). Early
Macs (everything prior to and including SEs and IIs) had a floppy
controller known as IWM (Integrated Woz Machine). Later model SEs and all
Macs following the II had a SWIM (can't recall the full name) controller.
The SWIM chip along with the proper ROMs allow use of a HDFD floppy drive.
There were upgrades available for the Mac II because the IWM chip (and
ROMs) were socketed. I'm not sure about if the SE's IWM chip was socketed
or not. The Plus' chip is not socketed.

In other words, unless you can find one of those old AE drives, you can't
use a 1.44Mb drive with a Plus.

I'm trying to fit a system and Hypercard player on one disk so my kids (ages 5
and 3) can use their stacks on a separate disk. It seems a 1.4 would do it if
it would read. Thanks!

Well, used harddisks are pretty cheap (sometimes free) if you can find
them. Search for 'used macintosh' on Yahoo.

Clark Martin

Date: Tue, 5 Aug 1997 22:33:39 -0500
To: Classic Posts
From: Rich McCord
Subject: Mac Plus Modem?

Greetings, all! Many thanks to those who responded to my last posting . .

My question this time: Does the Mac Plus require a modem (external, of
course) without an ADB cable, but with an external, switchable power
source? I ask this because I have read in several places that any modem
should be able to work. The 14.4 modem I use with my Performa doesn't work
on my Plus--the power is supplied through the ADB port, which a Plus lacks.

Supra's el cheapo modems are the only ones I can recall that use power from
the ADB port (except for some old ones by GV that connected via the ADB
port). Any other external modem should work.

I guess this leads to another question: where can one find 9600 or 14.4
modems meeting the criteria of having an external power supply and no ADB
cable? I'm checking some of the online classified boards, but I want to
resolve this technical question before I make a purchase.

Subject: SE SuperDrive -and- Booting Plus from Maxtor
Date: Wed, 6 Aug 97 07:36:12 -0400
From: Daniel Knight
To: Classic Posts

1. I do not have any software that can recognise an IBM disk
in the superdrive. Was this in the standard system?

Apple didn't ship PC Exchange with the sytem until 7.1, if I remember
correctly.

But it was available before that commercially.

[MODERATOR'S NOTE: Maybe so. But I remember having a program on my SE
FDHD under System 6.0.8 and 7.0 that I could open and stick an
IBM-formatted disk in in order to read it and transfer files to and fro
between the Mac and my Wintel machine. It was an Apple program, but the
name slips my mind for the moment--something like "Apple File Translator"
or so. Does anyone else have this program?]

Apple File Exchange I believe. And it was a clunky beast. I seem to
recall that System 7 included PC Exchange but it's been awhile.

From: "Michael E. Abrams"
Subject: Can't Boot a Plus from 120MB Maxtor

I have been unable to boot my MacPlus from my external 120 mb
Maxtor. I have tried everything. THe drive is just not recognized
by the SCSI program.

The drive is easily recognizable on a SCSI chain with my 7100....

Your drive is probably interleaved at 1:1. The SCSI port on a Mac Plus
cannot handle a 1:1 interleave and is being overwhelmed by data.

Yes it can. a 1:1 interleave just means the data is available before the
Mac can use it and thus it has to wait for the disk to spin around again.
This can happen on a drive no matter what the interleaving is, if the
processor is busy enough processing the data already read.

More than likely the problem is either lack of termination power or a SCSI
boot up problem either of which are known limitations of the Mac Plus.
Pluses can't work with some SCSI drives. This is mostly due to the Plus
having come out early on before the SCSI standard was really standard.

From: John Ruschmeyer
Subject: Re: Plus and Bad Power Supply
To: Classic Posts
Date: Wed, 6 Aug 1997 09:54:33 -0400 (EDT)

I'll be darned, that does seem to be the problem. I finally took apart
my known-working Plus and swapped the MBs. Low and behold the supposedly bad
board works fine.

So... any idea what component(s) may be failing? I can't seem to find my
copy of Larry Pina's book. :-(

A couple of years back, I got my first Plus and ended up fixing 3 or 4
supplies. One was totally dead (which I never did get working), the others
had the "usual" failures (vertical line, burned connector, bad flyback, etc.).
This one has me a bit stumped, though.

Someone off-line suggested that the HV transformer may be spiking and
causing the random crashes. I did notice that the flyback appears to have
some problems (rippling screen), so would it be good to start by replacing
that and the associated transistor? (God I hate replacing that transistor.)

I bought one old Mac Plus that would boot but then after awhile it would
restart. The +5 Volts wasn't. It was quite a bit low. I adjust it up to
5.00 and it works fine now.

Date: Wed, 6 Aug 1997 08:57:40 -0600
To: Classic Posts
From: Julie Walstra
Subject: NEC CDR36--Need Drivers

Got an old NEC CDR36 cd-rom as a donation, but no software. The drivers NEC
has posted do not cover this model. Anybody got one or got any ideas? Email
me directly if you have any clues.

I just hooked up a NEC Multispin 3X and it worked with Apple's drivers.

YMMV

Clark Martin