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As an example I started with CPM56K.IMD and created the CPM56K.RAW file, then copied the first 2048 bytes to a new file. Then appended the complete...

I don't know if there were any Re-works / Variations of the internals of the 5155 PSU, I've only seen the inside of mine, Any list made, May or may...

Yes. It wasn't a problem to find someone with the right type of printer. The problem was the short time period that we needed it. We needed it within...

The 9000 is a bizarre creature when it comes to floppy access. Pretty much driven by the CPU with zone recording techniques. The 9000 was known...

It shouldn't be difficult to find someone with a tractor-feed daisywheel or dot-matrix printer that can take the full 14" greenbar paper. I probably...

OK. Thanks. We were able to get a VCF member to get his printer going even thought it hadn't been used for 12 years. CHM referred the Film company to...

Well, even in this day and age, a liquid N₂ cooled mainframe is pretty unusual... ;)

It was usual on mainframes when deadstarting/booting the system to look at the wall clock and enter the time and date manually. Not a big thing. ...

no, I should check if I have anything scanned, or if CHM has any paper. we have a machine.

Makes me yearn for the bad old days of PCBs, sometimes.

so the command to do the full compile is "bpc /m nasmide", but there were some compilation issues - I was able to get it to to compile & run (though...

Also, in a power supply, it's not a good idea to use different types unless you really, really know what you are doing. The characteristics of the...

The badcaps forum used to maintain lists of capacitors for a given unit, but I doubt that they'd have one for a 5155--too old an not common enough.

Most use plain old aluminum "wet" electrolytics. Assuming they're not abused, they'll give you at least 10 good years of service. Solid polymers...

Last year I found 4 of them in various (but mostly still working/decent) conditions at the recycling center. Fixed them up and sold 3 on eBay (2...

Probably, it's nothing like any other CDC machine. Thank heavens for that--given the time, it was a remarkable effort that pushed IC technology...

Hi, Not sure if you have been PM'd already but Marc Verdiell has done this on the CHMs 1401. It was only a snippet. But then again that is all you...

if you stay in the context of the 80s/90s where the real time clock was relevant, storing the configuration in the RTC chip made a lot of sense my...

The problem (as I saw it when the "CMOS" for the 5170 was introduced) is that you want to keep configuration data in utterly nonvolatile memory. ...

Any of the 2102 manufactures should work. The P isn't necessary. Dwight

I should mention, although running a single NiCad cell to 0 volts is not an issue, running them in reverse will often cause out gassing that can not...

You have to worry about terminal voltage on the capacitors as well. If they are not rated for 5 volts, the typical resistor trickle charge can over...

Check the rail guides. Anything hanging on them would be a problem. Also check the wire routing. I agree about the track 00 sensor, also. I was...

I remember that directory now. Stack overflow strikes again. Thanks.

Definitely run PETTESTER and see what it displays for the different combos before changing the hardware.

All punches have now been sold.

That is typical design for a 3.5" drive. Chances are there is some solidified gunk in the groove. I'd clean that grease off with alcohol, make sure...