Where can I get the cps to program gr1225? Thanks!!

Totally enjoyed it

Great demo

Just binge watched the z80 series... well done and fun. If you ever create more i will watch! Liked and subscribed...

Not silly! Even though I already understood these principles on an MC6809, it's fun to get a refresher, on the Z80. A nice chip from what ... 1974? 40 years ago!

3 y/o but nice!

What are these worth today? I have one. Just wondering

Hi I Put together a GE Master lll to used us GMRS repeater, I have been trying to get the SWR but when I connect the SWR meter it wont read anything. Can you please make a video how to do it please. I`m using a SURECOM VHF/UHF 125-525 Mhz 120 watts. I plug the antenna to the antenna side of the meter and the TX side of the meter to the duplexer antenna connector. After I do all that I flip the switch REM PTT on the repeater and I don`t get any reading. Also The repeater transmit only a short distance maybe 100 feet, after I get off my drive way I lost signal. Please help me find out was wrong whit this. thank you very much. GMRS Somos Latinos USA

Can I connect my very old (but brand new in its original plastic) laptop power supply 19V 2.3A 60W in it to charge usb-c phones, nintendo switch, new laptops, etc?

i hope they dont make lap tops with usb power i have nothing but bad luck with usb technology. the old school ones work fine thanks.

I've been looking for my "perfect" hobby computer. I can't really decide if I want Z80 or 6502 based CPU. I built Ben Eater's kit, but got tired of futzing with the breadboard connections. Removing the ROM over and over again to program would pull some address lines. I just want a simple computer that I can hold in my head while programming. Eventually, I'll learn enough KiCAD to design my own with a ZIF socket for ROM and maybe a built-in max232 so I can just plug in a usb cable for power and comms. Maybe the RC2014 would do for my wants/needs but, I'm not really interested in running retro software so the memory map doesn't need to match old systems. Z80 is interesting because there are models that run 20MHz and I/O isn't necessarily mapped into memory space.

Can USBC-PD ports transfer data?

Thank you so much for this . I bough an old lathe with one of these , you saved me soo much time ❤️

T band, bummer. I kick myself for not buying low split UHF MASTR II chassis years ago. I now reside in the EU and the ham bands are at 433 to about 438 MHz. None of my stuff I kept works on ham bands other than an Astro Saber and my XTL5000.

Thank you. Working on converting a vhf unit to ham band right now.

This is an amazing resource, thanks for taking the time to show us this great old machine!

Excellent explanation. Thankyou.

I am a novice, studying for extra class. Thanks for explaining circulators

This is great and fun. It's like running a linux on an STB.

Thank you for this information.

Thanks for making the video.

Not sure if it exists but a chip with 8K ROM (erasable) and 56K RAM in 1 chip would be nice to cut down on components and wiring. Maybe only suitable for hobbyists so not economically viable. Or other combinations like 16/48 etc.

Nice job… you appeared to be so much less panic-stricken than I remember myself in that position. Then again, that was back before electric lighting existed. 🤣 Thanks for sharing all of this. btw - Are you still living in Kalifornistan? If you’re anywhere the NJ/NY area and want a box ‘o gear, let me know. I have a bunch of Quantars and other deprecated 2-way gear in UHF that could use a nice home. 😊

Excellent presentation.! Thanks for recording and making it available for everyone. IMHO… the advent of P25 TRS systems, now becoming ubiquitous, are now making public safety less safe. Digital technology, be it P25 (Phase I and II), DMR, NXDN.. is actually helping to overcome the perceived loss of coverage caused by narrowbanding. (12.5Khz channel spacing). The problem is the use of networked and trunked systems where the failure of a single site/repeater component can cause devastating failure systemwide. Even worse, when the agencies running the comm systems are implementing the “Evil-E”. (encryption), the risk of failure is large and the lack of transparency is troubling to anyone treasuring freedom. P True interoperability really requires that public safety agencies can talk/hear all other agencies they can expect to encounter on a scene. My comments are based on my personal experiences on 9/11/2001at WTC and a complete cluster F. Thanks again for the video!

Thank you Sir! Great presentation….

what wattage solar panel do you use to run this repeater?

so from the video it sounds like only A0-A7 are valid on /IORQ going low. That said I am looking at the manual for th Z80 (IXYS UM009011-0816) on page 11. From the timing diagram I read it as A0-A15 are valid. I could be reading this wrong or the data book I downloaded is bad.

So, I was looking for a solution to power my HX Stomp - a digital Guitar/Bass Effect modeler. It needs 9V but much higher Amps than the usual effect Pedals used. Happens to be, that there is little to none inexpensive solution...until now.

hi friend, is posible helpme whit a codeplug vhf of m120, thanks for all.

Great demonstration; that refresh confused me a while back in the day but was a super innovative feature that allowed the Z-80 to be a real computer system CPU at extremely low cost because making DRAM refresh counters that didn’t collide was a real pain! 😊

FANTASTIC

Hi Kenneth, I am looking for such a solution for my sensor network. I want to power a 100 ma Particle sensor (and some other greedy sensors) outside my house for sensing the air. If the air is ok ventilation is possible. So i need a constant monitoring device and using a battery pack is not an ideal option because of the greedy power consumption. A wire to the outside is also not really feasible, and I want to make a wireless power connection though my window. The window is double glass and effeciency is not an issue to me, as long as it works. Do you think these modules can work through double glass windows?

Thanks Kenneth. I used to do this too but I forgot how. Thanks for making the connections! I might try to use the principal to get an old phone to trigger an answering machine for an artwork.

That m.2 slot would fit a ssd

Cute. Instead, turn on 67Hx CTCCS on your portable, and crank up the receive volume to about 3/4. It'll stop cutting you off. Nice features rundown. I can't help believe you were trying to crack a walnut with a sledgehammer.

Cool. How c is changing?

Can you describe how parametr c is changing? Or show code

It's called 5,5 times 2,1 as far as I know as a newb!

Woah! How did you do it?

Bank Switching. That's where some memory chips occupy the same address space as others, but there is a way (often through using I/O ports) to switch the access signals on or off so that only one set of memory chips get the access signals at any time. With the Z80, it was common on multi-user systems to have 16K of common memory occupying the top of the memory space and the bottom 48K of address space could be switched in 16K "blocks" to provide 128K or more of virtual bank-switched memory. Whenever the OS time-shared to a different user's programs, it would switch out the previous user's programs and switch in the next user's programs by bank switching the RAM.

I came across this while trying to figure out why my induction charging was so touchy on my hobby project. The ferric material was an absolute game changer in regards to charging speed and placement.

Nice but how do I make this device only output 5V? There appears that there is no mode for 5V only.

Excellent explanation, thank you

Great idea. Sidenote some of those wifi routers run internally at 3.3v, so they already ran off 5v usb powerbanks.

All you need is permanent storage and a way to intercept IO and then your virus can replicate from flash drive to flash drive. Bonus points if you can make it reset resistant (survive resets)

Nice project thinking of getting a kantronics tnc, tried using a raspberry pi build but when on air it repeated everything…. The packet network local to me went crazy with a constant stream of packets.

I had a buddy that created a flash strobe controller board using an EPPROM. His project was crashing each time the strobe ignited. He searched and searched, convinced it was a power surge making his board crash. Finally found it was the light hitting the EEPROM just enough to crash the memory but not enough to erase it. Make sure those stickers on the EPROMs are really opaque ! 😂

Ridiculous? We have one with tone access that makes it so much easier to coordinate moving off to a repeater or simplex. And... You don't hear constant chatter except for folks paging each other.

How could one build this without having an HP service device? How much does an HP unit like that cost and how does one go about learning how to use one? I’m a General class HAM and there’s a lot I don’t know here. I’ve all but given up on finding a simple repeater to build low cost for use at camping trips and 4x4 adventures. Bummer. I just want something I can throw in a vehicle and park it on a high peak in the operation area of the event and have a short range temporary repeater for use over a weekend outing. Any ideas 💡?