Decoding kryoflux stream for HP9895A

2016-09-20 Thread Denise de Vries
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

Re: Value of 7-track TU10

2016-09-20 Thread Michael Thompson
> 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

Re: VCFMW 11, downloads

2016-09-20 Thread Jörg Hoppe
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

Need help: DSD-440 with unresponsive formatter/control board

2016-09-20 Thread Julian Wolfe
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

Re: Need help: DSD-440 with unresponsive formatter/control board

2016-09-20 Thread Jerry Weiss
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

Re: Need help: DSD-440 with unresponsive formatter/control board

2016-09-20 Thread Julian Wolfe
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

Re: Need help: DSD-440 with unresponsive formatter/control board

2016-09-20 Thread Jerry Weiss
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

Re: Need help: DSD-440 with unresponsive formatter/control board

2016-09-20 Thread Julian Wolfe
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

Re: Need help: DSD-440 with unresponsive formatter/control board

2016-09-20 Thread Jerry Weiss
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

Re: Decoding kryoflux stream for HP9895A

2016-09-20 Thread Eric Smith
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

Re: 68K Macs with MacOS 7.5 still in production use...

2016-09-20 Thread Liam Proven
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,