Assembly?

[JKnightandKARR]

This is what I need to hook it to my tv.  Know any tricks I can use to do this?

These are matching transformers for when you're trying to connect a 300Ω 2-wire lead from an FM antenna to the 75Ω coaxial connector on the back of the TV.

I'm pretty sure that there is a matching transformer in the box that I sent to you.

I took the one I bought appart and have made the circuit using 2N3904, 33 ohm and 100 ohm resistors. I have the 33 ohm resistor soldered to the output, and the 100 ohm resistor to gnd, still need to hookup the input and 5V using ext wires, which I need to dig out.

Well, there wasn't the adapter in the box, but I found one in the basement while I dig out the RF converter from my old NES/SNES systems, nothing there, I also tried the adapter I found in the box, nothing from it either, so while I can't try it on the system I got from the Antique mall, cut the wire from the pcb to the rca jack, so might go ahead and use my scope, to probe the PCB on the UCLA, whatever it's called, and see if there's an output signal on either system as well as where the signal pin is, also need the clips that came with my cheap LCR meter to test the transistor I used.

So either A)The systems so far don't work and have to be repaired, or B) Even though my TV has a coax jack, it DON'T like the systems at all...  Guess I could try them through my VCR on my other tv...

[Chris Savage]

So either A)The systems so far don't work and have to be repaired, or B) Even though my TV has a coax jack, it DON'T like the systems at all...  Guess I could try them through my VCR on my other tv...

Too bad you don't have something with a known good signal for verification.

[granz]

Too bad you don't have something with a known good signal for verification.

Yeah, a television signal generator would be great.

Do you happen to have a Raspberry Pi Zero (2, W or 2W)? They have composite output:

This is for the original Pi Zero (or Zero W), and the article about it is at: https://magazine.raspberrypi.com/articles/rca-pi-zero

The Zero 2 (and 2W) have solder pads for composite out:

And the forum posts about this are at: https://forums.raspberrypi.com/viewtopic.php?t=381237

Note that most Pi computers have composite out, I just mention the Pi Zero because of it's extremely low price. If you have the original Pi, it actually has an RCA connector on the board.

[JKnightandKARR]

So either A)The systems so far don't work and have to be repaired, or B) Even though my TV has a coax jack, it DON'T like the systems at all...  Guess I could try them through my VCR on my other tv...

Too bad you don't have something with a known good signal for verification.

I have an Atari 2600 amd the ZX81 power supply should work in it, same jack n voltage. Gotta try it.

Too bad you don't have something with a known good signal for verification.

Yeah, a television signal generator would be great.

Do you happen to have a Raspberry Pi Zero (2, W or 2W)? They have composite output:

This is for the original Pi Zero (or Zero W), and the article about it is at: https://magazine.raspberrypi.com/articles/rca-pi-zero

The Zero 2 (and 2W) have solder pads for composite out:

And the forum posts about this are at: https://forums.raspberrypi.com/viewtopic.php?t=381237

Note that most Pi computers have composite out, I just mention the Pi Zero because of it's extremely low price. If you have the original Pi, it actually has an RCA connector on the board.

I do not. Is there a way to hook them up to the system or something?

[granz]

I do not. Is there a way to hook them up to the system or something?

I don't know what you mean by hook them up to the system or something. The Raspberry Pi is a system in itself. If you just load the Pi OS, with the changes mentioned in those links above, the Pi will give the desktop video out on the composite pins/RCA socket. You plug that into your monitor/television to verify that the monitor works. That will give you the something with a known good signal for verification that Chris mentioned.

So either A)The systems so far don't work and have to be repaired, or B) Even though my TV has a coax jack, it DON'T like the systems at all...  Guess I could try them through my VCR on my other tv...

Too bad you don't have something with a known good signal for verification.

[JKnightandKARR]

I do not. Is there a way to hook them up to the system or something?

I don't know what you mean by hook them up to the system or something. The Raspberry Pi is a system in itself. If you just load the Pi OS, with the changes mentioned in those links above, the Pi will give the desktop video out on the composite pins/RCA socket. You plug that into your monitor/television to verify that the monitor works. That will give you the something with a known good signal for verification that Chris mentioned.

So either A)The systems so far don't work and have to be repaired, or B) Even though my TV has a coax jack, it DON'T like the systems at all...  Guess I could try them through my VCR on my other tv...

Too bad you don't have something with a known good signal for verification.

I didn't know if someone had one of those Pi's to change video, but i know what you mean now. Lol I got a Nintendo Wii hooked up to my tv right now, so I know the composite works. Off next 2, so tonight, I'll break out a scope n probe inside to see what I can find.

[JKnightandKARR]

Starting thread in Vintage computers..

[JKnightandKARR]

I found a ZX Spectrum emulator on Android store, will mess with it, probly need to use my tablet or see if I can get my late mom's boyfriend's old Chrome laptop n set it up with stickers on the keys.

[granz]

I found a ZX Spectrum emulator on Android store, will mess with it, probly need to use my tablet or see if I can get my late mom's boyfriend's old Chrome laptop n set it up with stickers on the keys.

Yeah, that is the biggest issue with Sinclair emulators - the unusual keyboard. I like your idea of taking an old keyboard, and pasting TS-1000/Z-81 stickers on to the keys to dedicate to TS-1000 emulation.

[Chris Savage]

Yeah, that is the biggest issue with Sinclair emulators - the unusual keyboard. I like your idea of taking an old keyboard, and pasting TS-1000/Z-81 stickers on to the keys to dedicate to TS-1000 emulation.

Same thing with Commodore computers...non-standard keyboards.

[JKnightandKARR]

I found a ZX Spectrum emulator on Android store, will mess with it, probly need to use my tablet or see if I can get my late mom's boyfriend's old Chrome laptop n set it up with stickers on the keys.

Yeah, that is the biggest issue with Sinclair emulators - the unusual keyboard. I like your idea of taking an old keyboard, and pasting TS-1000/Z-81 stickers on to the keys to dedicate to TS-1000 emulation.

Yeah, that is the biggest issue with Sinclair emulators - the unusual keyboard. I like your idea of taking an old keyboard, and pasting TS-1000/Z-81 stickers on to the keys to dedicate to TS-1000 emulation.

Same thing with Commodore computers...non-standard keyboards.

In this case it's a Google Chromebook laptop, so to me not real useful for anything else... lol, but I DID install Speccy on my Tablet. Has 2 keyboard overlays on the screen I can pick from and multiple Spectrum's to try, I just need to figure out the Spectrum 128 keyboard/system, I can type something like PRINT, but I can't figure out the 1 button of adding said function, but I did get Print "Hello" to work lol

https://lh3.ggpht.com/mX0ZYWW3Q08tdm9Nj--tjFxprVfMzg2jE_riOKzBDldW56zOK3nB_pms8F8blKYGwg=h900

[granz]

Yeah, that is the biggest issue with Sinclair emulators - the unusual keyboard. I like your idea of taking an old keyboard, and pasting TS-1000/Z-81 stickers on to the keys to dedicate to TS-1000 emulation.

Same thing with Commodore computers...non-standard keyboards.

Yes, although, if you do not need the graphics (I.E. if you are using the C=>64 emulator just for "business-type" programs, or other) then you can ignore the graphics and use a regular PS/2, or USB, keyboard as is. Without the BASIC keywords which are printed on the Sinclair keyboard, it is very difficult to do any programming.

[Chris Savage]

Yes, although, if you do not need the graphics (I.E. if you are using the C=>64 emulator just for "business-type" programs, or other) then you can ignore the graphics and use a regular PS/2, or USB, keyboard as is. Without the BASIC keywords which are printed on the Sinclair keyboard, it is very difficult to do any programming.

Gotcha. It's kind of crazy but, despite my love for the Z80, I was never able to obtain a ZX80 / ZX81, so I have zero experience with them. 

[JKnightandKARR]

Yeah, that is the biggest issue with Sinclair emulators - the unusual keyboard. I like your idea of taking an old keyboard, and pasting TS-1000/Z-81 stickers on to the keys to dedicate to TS-1000 emulation.

Same thing with Commodore computers...non-standard keyboards.

Yes, although, if you do not need the graphics (I.E. if you are using the C=>64 emulator just for "business-type" programs, or other) then you can ignore the graphics and use a regular PS/2, or USB, keyboard as is. Without the BASIC keywords which are printed on the Sinclair keyboard, it is very difficult to do any programming.

I have a BlueTooth keyboard for my tablet, so if I can figure out what I did with it, I can use that for this.

Yes, although, if you do not need the graphics (I.E. if you are using the C=>64 emulator just for "business-type" programs, or other) then you can ignore the graphics and use a regular PS/2, or USB, keyboard as is. Without the BASIC keywords which are printed on the Sinclair keyboard, it is very difficult to do any programming.

Gotcha. It's kind of crazy but, despite my love for the Z80, I was never able to obtain a ZX80 / ZX81, so I have zero experience with them. 

So far no Android apps other then the Speccy and Speccy+, both Spectrum, but there are options available for Windows for the 80/81.

[Chris Savage]

So far no Android apps other then the Speccy and Speccy+, both Spectrum, but there are options available for Windows for the 80/81.

Just to confirm, you're looking for something (emulator) you can practice / learn Z80 assembly on, yes?

P.S. - I must admit...just talking about this is making me extremely antsy about reviving my Z80 Retro Computer project, which I hadn't gotten very far in.