🚀 go-pugleaf

From: CSTACY at MIT-AI (Christopher C. Stacy)

INFO-MICRO AM Digest    Thursday, 30 July 1981     Volume 3 : Issue 54

Todays's Topics: 
             MC68000 - 10Mhz  &  Lisp-P?,
             Disks -  Lubrication Hints  & SMD Query &  What is MFM ?,
             CCS Memory,    Theft report
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Date: Sunday, 14 Jun 1981 12:41-PDT
From: mike at RAND-UNIX
Subject: 10mhz 68000

>From Electronics, June 16, 1981, p 225:

        Motorola Semiconductor Group of Austin, Texas, has
        introduced a 10-mhz MC68000L10.  Designeers requiring a
        68000 faster than the current 8-Mhz microprocessor will
        gain 25% in throughput with the 10mhz version.  The fast
        microprocessor is the result of Motorola's program for
        yield enhancement.  Samples are now available for $449
        each.

------------------------------

Date: 13 June 1981 16:41-EDT
From: William A. Kornfeld <BAK at MIT-AI>

Are there Lisps available for the 68000?  
Any on the drawing board (besides MIT NIL)?


------------------------------

Date: 18 June 1981 03:38-EDT
From: Keith B. Petersen <W8SDZ at MIT-MC>
Subject: Lubrication of floppy disk drives

I just received the following message on my remote CP/M
system:

 Date: 6/17/81
 From: Charlie Strom
 To:   All
 Re:   Shugart floppy disk drive lube

 I recently received some valuable info re lubrication of
 Shugart 8" drives, prompted by intermittent squeaking from
 a drive!  Carefully, spray a small amount of aerosol sili-
 cone lubricant on the lead screw (without getting it all
 over the place!).  I was amazed at the noise reduction I saw
 immediately.  According to my source, Shugart has done this
 themselves in spite of no mention in service manuals.  It
 certainly hasn't hurt my drive operation.  Don't use a
 lubricant with any petroleum base... pure silicone (food
 grade) only!  The brand I have is called Sprayway, from
 Sprayway, Inc., Addison, Ill 60101.

------------------------------

Date:  10 June 1981 16:09 edt
From:  Sibert at MIT-Multics (W. Olin Sibert)
Subject:  SMD Interface
Sender:  Sibert.Multics at MIT-Multics

Can anyone direct me to a source for the complete hardware specification
for the Storage Module Drive hard disk interface?

(Replies to Sibert@MIT-Multics, not to this list)

------------------------------

DEVON@MIT-MC 06/10/81 00:43:51 Re: MECA Disk query, & what's MFM?

Does anyone know anything about the Meca "Delta 1" disk 
controller for s-100?
I'm looking for something that can at least read but hopefully also
write on both single and double density North * Star disks.

The Meca board uses MFM (Modified Frequency Modulation) and has
512-byte sectors, which is what N* uses in double density mode, so
perhaps with suitable software...

This brings up a theoretical question which has bothered me for years:
What exactly *is* MFM anyway?  In fact, what are the details of *all*
the different floppy disk recording techniques?

I have a vague idea that N*'s 1D recording is like this:

  .--.  ....  .--.  ....
  !  !  :  :  !  !  :  :
--    --    --    --    --

(this looks awful!)

the solid pulses being for bit synch, and the dotted ones actual bits.

I have an equally vague idea that what you read looks like the
derivative of what is there.

------------------------------

Date: 9 Jun 1981 2212-PDT (Tuesday)
From: Lauren at UCLA-SECURITY (Lauren Weinstein)
Subject: CCS memory boards

I would appreciate information regarding your experiences with
the CCS static (CCS2032 -- 32K) and dynamic (CCS2065 -- 64K)
memory boards... particularly the latter.  

My application involves intergration with an IMSAI-type front
panel and an Ithica Audio Z80 at 4Mhz.  I have always been very
wary of dynamic memories, and have been particularly concerned with
wait states and DMA.  Is the CCS board reasonable?  Will it work 
reasonably with OTHER than CCS CPUs?  How about their static board?

Thanks much.

--Lauren--

------------------------------

Date: 29 May 1981 (Friday) 0932-PST
From: DWS at LLL-MFE
Subject: Write one off to education ...

Thanks to all who responded to my cry for help through Info-CPM.
The first problem, that of jumpering Shugart 801R's, has been
solved.  The problem was in two parts, the first being a difference
between the OEM manual and my PCB, the second being incredibly silly.
After first tying my new system together I found that I couldn't write
on any disks.  BIOS kept giving me a "write lock" status error.  A
careful check of the wiring and jumpers didn't help.  It seems, however,
that scotch tape is not sufficient to write enable a floppy when one
has photoelectric sensors.  Oops.

The second problem is still there.  The ROM on my CCS disk controller
gets disabled when CP/M is booted, but never gets re-enabled on reset
to reboot CP/M.  Could anyone out there with a CCS disk controller/CPU
combination tell me how they have their jumpers set?  Much thanks.

                "Hardware is a neccessary evil"

-- Dave Smith
 
------------------------------

Date: Thursday, 11 Jun 1981 08:01-PDT
From: jim at RAND-UNIX
Subject: Stolen computers

Two computers were stolen from my home in Topanga, CA on 10 June:

(1) Heathkit H89, Serial #00908
    64K RAM, RS232, FBE centronics interface card
    Outboard 5.25" drive, plain black case
    Identifying marks:
      gummed graphic symbols on the fronts of
      keys braided cables from the power supply (!)
      grey paint on front of keyboard worn off, 
      below return key

(2) Atari 800, Serial #081-1577
    32K Microtek RAM cartridge, Editor/Assembler, Basic, 
    Star Raiders modules, 13" RCA color TV, Serial #048311463

If either of these is spotted (preferably with my Kenwood TS-520 radio
nearby), please contact the L.A. Sheriff's Office, (213)-456-6652 and
tell the detectives about File #581-03337-1035-507.

    Thanks...
    Jim Gillogly

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End of INFO-MICRO Digest
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