> From: j...@mercury.lcs.mit.edu
> Subject: Value of 7-track TU10
>
> So what do people think the (monetary) value of a 7-track TU10 master drive
> is? I have no idea what these older vacuum-column drives are worth - don't
> recall ever seeing on for sale. This one is in good condition, and has a
Jay, Jason & others,
thanks for all the organization
>
>
> To my eye, attendance was up this year yet again.
>
...
> The touch screen 11/70? Front panel connected to emulation was awesome!
The simulations are for download at
https://github.com/j-hoppe/BlinkenBone/releases
My photos are at ft
On 16 September 2016 at 14:51, David Bridgham wrote:
> On 9/15/16 23:13, ben wrote:
>
>> PS: Ternary arithmetic I can understand, but Ternary Logic needs Mr
>> Spock to figure out.
>
> Ternery logic would seem to be useful for implementing an asynchronous
> design instead of, say, dual rail encodi
Does anyone know of documentation for the HP9895A format with its own M2FM
encoding?
I have a kryoflux preservation stream but so far can make no sense of it.
Denise
So the DSD-440 I got at VCF is completely unresponsive. All of the LEDs are on
and never go out, which is bizarre - they are supposed to go out in 1/10 of a
second after power on.
I tried disconnecting everything but power to the card, and it still lights all
LEDs. No jumpers that I could
On Sep 20, 2016, at 12:49 PM, Julian Wolfe wrote:
>
>
>
> So the DSD-440 I got at VCF is completely unresponsive. All of the LEDs are
> on and never go out, which is bizarre - they are supposed to go out in 1/10
> of a second after power on.
>
>
> I tried disconnecting everything but power
Both green LEDs are on. They're ALL on.
This is a failure of the DC Power Up/Down circuit - See page 3-10 + 3-53/54 in
June 83
Service Manual. If the components in this circuit (capacitor) are out of spec,
then this may be the cause.
Congrats on picking it up. I was tempted to bid fo
On Sep 20, 2016, at 1:37 PM, Julian Wolfe wrote:
>
> Both green LEDs are on. They're ALL on.
>
>
As LED 9 is on (sorry for not being clear), then the CPU is active. That’s a
good sign.
Definitely look at the DC Power up/down circuit first.
Jerry
After reading this section, I should probably bring up that when I checked the
PSU voltages, the 5v+ line was low, at 4.7v or so. I adjusted it back to 5.05v
on the pot as defined in the manual, and there it stayed steady, but it didn't
seem to help. Before I adjusted the pot, it was fluctuati
On Sep 20, 2016, at 2:02 PM, Julian Wolfe wrote:
>
> After reading this section, I should probably bring up that when I checked
> the PSU voltages, the 5v+ line was low, at 4.7v or so. I adjusted it back to
> 5.05v on the pot as defined in the manual, and there it stayed steady, but it
> didn
On Tue, Sep 20, 2016 at 7:42 AM, Denise de Vries
wrote:
> Does anyone know of documentation for the HP9895A format with its own M2FM
> encoding?
> I have a kryoflux preservation stream but so far can make no sense of it.
I've successfully decoded Intel M2FM disks. The track-level format
isn't t
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