>
>Subject: Re: CompuPro floppy controller differences
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Wed, 20 Sep 2006 23:16:24 +0100 (BST)
> To: cctalk at classiccmp.org
>
>>
>> On Tuesday 19 September 2006 18:57, Tony Duell wrote:
>> > > I also have/had a horrible one, originating from a Philips mini (PTS6000)
>> > > which used 115VAC for one of the motors
>> >
>> > Most [1] 8" droves had mains-operated spindle motors, often 115V
>> > (although 230V versions did exist). Note that the spindle speed depends
>>
>> Actually, I've got one that is set to run on 240V, 60Hz. It's out of a
>
>Needless to say the voltage is not that critical. 220V, 230V, 240V are
>all the same :-)
>
>> (broken and now disassembled) IBM 3274 terminal controller (for the microcode
>> floppy, of course).
>>
>> > [2] One reason I wouldn't conssider moving my collection to the States.
>>
>> Oh come on, The Great Dr. Duell isn't afraid of replacing SMT chips on boards,
>> but is afraid of having to change a few pulleys? Something sounds fishy
>> here...
>
>Oh, I'd be happy to change the pulleys and reset the belt tensions. The
>problem is _getting_ the pulleys. Do you want to be the chap who phones
>Seagate and says 'Hello, I think you used to be Shugart, do you have the
>60Hz conversion kits for the SA801, SA851 and SA4000 in stock'
Pft! If you brought them here you'd find spares from used drives or even
working domestic versions. Non of those floppies are exactly rare and even
the SA4000 is still around.
Allison
Date: Sat, 23 Sep 2006 09:13:18 +0100
From: Gordon JC Pearce <gordon at gjcp.net>
Subject: Re: Commodore keyboards and PCs
>>> Erm... If you just wanted to encode switch presses to a PS/2 input, why
>>> not just buy an el-cheapo keyboard for about ?2 from your friendly
>>> neighbourhood computer shop and set about it? Bit better than the $100...
>>
>>> Gordon
>>
>> -------------Reply:
>>
>> True enough, but you don't have the look & feel or the C64 key labels & layout;
>> I think the idea is to use a defunct C64 and use it as a keyboard for the emulator.
>That's why you use an el-cheapo keyboard and pull the board from it, and
>hook up your own matrix...
Ah, I misunderstood; I thought you meant just relabel the keys. Mind you, rewiring
the matrix would make the keyboard incompatible with the C64 (although it'd be a
relaxing project for a Saturday afternoon...)
I didn't mean that it _had_ to be defunct, just that if you only had a non-repairable C64
this'd be a good way to have its equivalent; if your PC had video out as many of them
do these days, you could even hook it up to a Commodore monitor for the real look&feel.
But if all you need is input from a few buttons or switches like for a dedicated MP3
player for example, using the guts from a keyboard is a quick & easy way to go
(as ethan described); have done that too for a few projects. Interesting to see how
they've shrunk over the years, from 2 or 3 LSI and a half-dozen TTL glue chips to
a tiny blob of epoxy...
mike
On Aug 19 2006, 9:38, Wolfe, Julian wrote:
> I got the 11/34 up and running, and I loaded XXDP. It fails the trap
> test. The instructions state you should examine the stack pointer
> (777706) which shows it to be a value of 000470. This is supposed to
> tell you the address of the Program Counter, right? So I load address
> 470, and the value is 000330. What instruction is failing? Am I
> reading this right?
Yes, the stack pointer points to the last address used on the stack,
and that will be the value of the PC when it called the error
subroutine, or to put it another way, the address of the next
instruction to be executed had the JSR not been taken. It's failing at
whatever test was just before location 330 -- which is surprisingly
low. You'd need to look at the listing to see what the test was.
--
Pete Peter Turnbull
Network Manager
University of York
>
>Subject: Re: CompuPro floppy controller differences
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Thu, 21 Sep 2006 22:28:09 +0100 (BST)
> To: cctalk at classiccmp.org
>
>> >Oh, I'd be happy to change the pulleys and reset the belt tensions. The
>> >problem is _getting_ the pulleys. Do you want to be the chap who phones
>> >Seagate and says 'Hello, I think you used to be Shugart, do you have the
>> >60Hz conversion kits for the SA801, SA851 and SA4000 in stock'
>>
>> Pft! If you brought them here you'd find spares from used drives or even
>> working domestic versions. Non of those floppies are exactly rare and even
>> the SA4000 is still around.
>
>Are they really that common in the States? They are not at all common in
>the UK any more, so don't think of that as being a source for 50Hz pulleys...
If you were her than 50hz pulleys are a non issue. ;)
>And those were the easy drives. I guess RK05s wouldn't be too hard to
>find 60Hz pulleys for either. What about RX01s/02s? Do RK07s need
>converting? RL's I know don't. But my ASR33 would. And all my audio tape
>recorders (some of which may never have had 60Hz varients).
Lifes rough. The solution I used once for a 50hz and later a 400hz motor
was a simple transformer output pushpull amp fed with a wein bridge osc,
a very good way to generate variable frequency sinewavs in the <100W class.
so happens I had a 12.6V CT (12A) transformer with the requisite 120V
primary. Into a lamp load it was under 1% THD and voltage stability was
as good (5%). I ended up using it for all sorts of AC motor control
solutions. Didn't require special parts or machine shop either.
>Don't worry, I am not going to move to the States. It would be totally
>impractical for a lot of other reasons.
Whats practicality got to do with anything? :)
Allison
Not to take any business away from Jim and they are a little expensive,
but wouldn't an off-the-shelf keyboard encoder do the job?
I've used Hagstrom's KE24s ($99.99) for years, albeit in RS-232<>PS/2
mode. User-programmable matrix or discrete switch inputs to PC keyboard
or RS-232, as well as RS-232 to/from PC keyboard.
www.hagstromelectronics.com/modules.html
mike
-----------Original messages:
Date: Thu, 21 Sep 2006 07:27:40 -0400
From: "Richard A. Cini" <rcini at optonline.net>
Subject: RE: Commodore keyboards and PCs
To: "'General Discussion: On-Topic Posts Only'"
<cctech at classiccmp.org>
Message-ID: <005901c6dd70$f2f2c570$6401a8c0 at bbrrooqpbzx6tz>
Content-Type: text/plain; charset=US-ASCII
Yep, saw the DIY package. I was looking for the boards already done.
This is not a front burner project for me just yet (other things in the
hopper right now), so I'll keep an eye out. Any idea of timing for boards?
Rich
Rich Cini
Collector of classic computers
Lead engineer, Altair32 Emulator
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
Web site: http://www.altair32.com/
/***************************************************/
-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org]
On Behalf Of Jim Brain
Sent: Wednesday, September 20, 2006 10:07 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Commodore keyboards and PCs
Richard A. Cini wrote:
> All:
>
>
>
> I'm playing around with VICE, the Commodore emulator and I
> wondered how others who use it deal with key remapping. Sometimes I find
it
> hard locating the mapped keys because I look at the keycap and of course,
> the key is wrong (like TAB is CTRL, ESC is RUN/STOP, etc.)
>
>
>
> I'm looking for suggestions beyond sticking little labels on
my
> keyboard :-)
>
>
www.jbrain.com/vicug/gallery/c=key/
Jim
Had a query from a chap looking for a DG Nova 3 in the UK, as part of a museum
project for English Heritage.
I'm still gathering details, but I'm getting the impression that the look is
far more important than operational status, as the software (and associated
network) that used to run with the particular system he's trying to recreate
is long-gone. (Hence I've mentioned just getting a mock-up done as one
possibility)
Anyone have a line on any Nova 3 systems left in the UK though? They never did
seem that popular outside the US; I know all we have at the museum are a few
stray boards.
cheers
Jules
--
If you've ever wondered how you get triangles from a cow
You need buttermilk and cheese, and an equilateral chainsaw
Hey all,
Just saw this on ebay uk - a VT420 with a buy it now price of ?50.
Makes the one I got for free seem quite valuable!
Item number 110034030429
Simon
--
------------------------------------------------------------------------
"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh
Well, I finally finished the MAX233 based User Port Serial interface
(it was basically finished Sunday). In case anyone is curious, here
are a couple pictures.
http://www.aracnet.com/~healyzh/MAX233-1.jpghttp://www.aracnet.com/~healyzh/MAX233-2.jpg
Of course I finally get it so I can get my Commodore 64 online only
to find out that Quantum Link Reloaded is down at the moment :^(
So far I've connected to a BBS in Toronto :^) Seems strange logging
into a BBS for the first time in nearly 13 years.
Zane
PS the real question is who can identify what I built it into :^)
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh at aracnet.com (primary) | OpenVMS Enthusiast |
| MONK::HEALYZH (DECnet) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| PDP-10 Emulation and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
Hi
--- Ethan Dicks <ethan.dicks at gmail.com> wrote:
> On 9/18/06, aliensrcooluk at yahoo.co.uk
> <aliensrcooluk at yahoo.co.uk> wrote:
> >
> > Hi,
> >
> > I got some 68000 DIP chips for ???3.00 off of
> www.vint
> > agecomputermarketplace.com the other week. I
> finally
> > got around to checking that they are of use to
me
> (
> > by comparing them with notes I have on the
> internals
> > of my old A600 Rev 1.1) and discovered that the
y
> ma
> > y not be of use to me! :(
>
> Not of use how? I've never owned an A600 (I have
> just about every
> other model)... do they have PLCC (square-package)
> CPUs?
Aye, the main CPU is square.
>
> Were you trying to aquire these chips for spares o
r
> for an upgrade?
Yeah, I just wanted them as spares for the
existing co-processors on my Amiga's.
Besides, for $3 (USD) I'm sure you couldn't
resist either (if you own a 68K-based machine).
>
> > Here's the low-down on them:
> >
> > MC68000P10
> > 2 C91E DIP chip (rectangle with pins
on
> long sides) x 2
> > QEDB9215
>
> Sounds like a Motorola CPU that can run as fast at
> 10MHz (they marked
> them as high as 12MHz, but I think those can be
> clocked at 16MHz).
>
> > S (large logo S) SCN68000CAN64
> > 2208N19 DIP chip x1
> > 9035KE
>
>> snip <<
>
>
> -ethan
>
>
Andrew B
aliensrcooluk at yahoo.co.uk
