Category Archives: Uncategorized

Upgrade HP3000 SIMH Disk Drive from HP7920 to HP7925

The virtual hard drive that came with SIMH is a 55MB HP7920 disk drive. With just the O/S installed, there isn’t a lot of space left on this drive. This HP3000 can also emulate a 120MB HP7925. This procedure will … Continue reading

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Using Kermit to Transfer files to/from SIMH HP3000

After talking to another HP3000 SIMH user who had no viable way to transfer files to the HP3000, I set out to look for something a bit easier than create a simH tape. OK, using kermit still isn’t simple, but … Continue reading

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Copy files from an HP3000/XL Computer System to a SIMH HP3000/Classic

In my prior post, Instructions for Emulating an HP3000 with SIMH, my enclosed PDF of instructions discusses getting files onto the SIMH HP3000 using Reflections or creating a SIMH format tape. Both of these options have limitations if you want … Continue reading

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Watch Dog Timer (WDT) for Teensy 3.1 and 3.2

I have had an ongoing Teensy project that is rather complex. Once in a great while (months), one of the units will hang somewhere in networking code. This is unacceptable and I’ve needed to implement a WDT, but I’ve been … Continue reading

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Making a Data Only Cable For Teensy/Arduino/Nano

Been working on a complicated teensy project that is going to the other side of the state for testing. So I’ve been building a testing platform that consists of a Raspberry Pi connected to the Teensy via USB. I can … Continue reading

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Using Bondic Plastic Welder (Glue)

I was given a Bondic applicator a few months ago: Found here for about $23: I finally got around to using it today. The stuff works great for me. I noticed one of the bars of the luggage rack … Continue reading

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Wiring Wiz820io Ethernet Module to Teensy 3.1 (or 3.2)

I have a Teensy 3.1 and Wiz820io Ethernet Module I want to connect together. PJRC does sell a little shield for the Wiz820io, but I plan to mount the Teensy to a PCB and want to do the same with … Continue reading

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FCC Proposes Blocking ‘Hacking’ of Router Firmware

I can’t really add more than can be found here. Please, send feedback to the FCC, there are only a few days left.  

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Using Just BASIC to Give a Young Person a Glimpse at Programming

I periodically either am asked what language should be used to show a young person, typically a high schooler, the basic concepts of programming or I find I am in the position of giving a quick explanation myself. All of … Continue reading

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AMAZON: Why did you screw up your shipment confirmations?!!!

Dear Amazon, Since you seem to have no way for customers to make suggestions, I’ll post this here. You’ll never see it, but at least I will have a chance to vent. At the beginning of the year you decided … Continue reading

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