Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile
Hey Birt!, The 'Assumulator'

@heybirt

Hey Birt! What'cha Workin' On? Professional nerd and tinkerer. An eclectic mix of vintage tech, new tech and R&D aimed at the hobbyist/enthusiast.

ID: 1143954338567610370

linkhttp://www.youtube.com/c/HeyBirt calendar_today26-06-2019 18:49:02

6,6K Tweet

687 Takipçi

45 Takip Edilen

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

Just looked up an AMP connector used on a TMS990/189 dev kit 45 years ago and found they are still available new from TE Connectivity using same part number. Amazing.

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this video we look at what I did wrong in a recent repair on an M100 & see if I can’t get it fixed for good. Next we look at a Cryptronics ROM Module. A solution from back in the day allowing for mounting multiple ROMs and a rechargeable power source. youtu.be/pm7JZaZ_crg

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this video we take a look at a TI TMS 990/189 dev board from 1980. In this first episode we’ll get it diagnosed/repaired. In next episode we’ll see what it takes to program the oddball EPROMs used and build some proper cables: youtu.be/D4gIoSXcUQM

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

Been playing with writing PC-1500 programs that span multiple banks on the CE-1638/163F. Have modified bank sw 'driver' to save/restore 2 more registers so it's possible to have segmented variable RAM (fixed vars A-Z still shared). Now, what is the 'killer app' to for this?

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this video we take a look at a TI TMS 990/189 dev board from 1980. In Part #1 we got the board running and ran a sample program. This time we tackle the cassette and RS232 interfaces, & burn some EPROMs to get University BASIC working. Let’s jump in. youtu.be/ohEvX8rfgos

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

The CE-1500T 'turbo' for the Sharp PC-1500 lives! I can now programmatically switch between a 1.3mHz and 2.0mHz clock with a simple POKE. Note hi-tech method of keeping ribbon from rubbing PCB :)

The CE-1500T 'turbo' for the Sharp PC-1500 lives! I can now programmatically switch between a 1.3mHz and 2.0mHz clock with a simple POKE. Note hi-tech method of keeping ribbon from rubbing PCB :)
Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

It's Ferengi Friday where we take a look at recent acquisitions that have made there way into the shop. I have hunted down the best deals to stretch my gold pressed latinum. Join us & see if we finally found a good deal on self-sealing stem bolts. youtu.be/5hMj5kIzOZY

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

What is it about submitting a PCB for manufacture causes you to realize a mistake about 10 seconds after clicking the order button?

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

Saw this video this weekend. Amazing Apollo spacecraft computer's analog multiplexer which used transistors with 4 legs... youtube.com/watch?v=I6lNQU…

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this video we look at a small PCB that turbocharges your PC-1500. With a POKE you can increase clock speed 50%, another POKE and you’re back to normal speed. We cover design, & cover the schematic and code behind it. Join us and find out how it works. youtu.be/l-t8-uN2CoI

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

Just got my website updated. Whew, that took forever. Did trial runs locally but of course everything works different on someone else's computer (server.)

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

I could not find my wire wrapping tool/stripper so I borrowed one. About 10 minutes after returning home with borrowed tool I found mine. I swear tools become sentient and just walk away sometimes but only sometimes do they choose to return.

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

I kept forgetting what mode I left my Backpack drive in so I 3D printed DB25M covers w/text for each mode. The parametric model made it easy to generate DB25F, DE9M&F to0. Not sure if I should all DA-15, DC-37, DD-50 (never seen DD in use).

I kept forgetting what mode I left my Backpack drive in so I 3D printed DB25M covers w/text for each mode. The parametric model made it easy to generate DB25F, DE9M&F to0. Not sure if I should all DA-15, DC-37, DD-50 (never seen DD in use).
Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this video we take a look at an HP 10529A Logic Comparator. Made in the 1970s by HP for testing 14-16 pin TTL ICs in circuit. We’ll do a bit of repair, find out how it works, do a demo and then look at a few extras that came with. youtu.be/WQsWD32EApw

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

What's worse than the sticky 'moldy candy bar' in a PC-1500/A? How about when it drys out and becomes the consistency of potting soil? What a mess!

What's worse than the sticky 'moldy candy bar' in a PC-1500/A? How about when it drys out and becomes the consistency of potting soil? What a mess!
Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this video we attempt to repair a failed B drive on an Epson TF-20 dual 5.25” disk drive for HX-20. The diagnoses takes a few wrong turns but we figure it out. Follow along and let us know if we should swap the B drive for a Gotek. youtu.be/VXemPQ22EuU

Hey Birt!, The 'Assumulator' (@heybirt) 's Twitter Profile Photo

In this Quick Fix video, we tackle a common problem with Sharp PC-1500 / TRS-80 PC-2, the loose battery door. Caused by using too long a screw & dislodging the captured nut. We cover making a new nut & securing it in your device and correct screw to use: youtu.be/6kyhSlS3DPw