Timex Sinclair 1000 repair

[JKnightandKARR]

You may also want to pick up a 62256 32K RAM chip and upgrade your TS-1000, per page four of the manual. That may be the best option.

If you don't have a 62256 and need one, I can send you one. I have a drawer of them. Every Z80 system I ever built has one installed. It was just easy to simply split the 64K address space into 32K ROM and 32K RAM.

Sure if its not too much trouble. I'll figure out how to install later.

@granz Yeah, I got the first 2 switches are video only n maybe the mic. It's the 2nd 2 that are memory, but will take your suggestion of off/off first

[JKnightandKARR]

New ULA is installed and I have to video setting done. As soon as I have the composite mod installed, I'll hook it up n try it.

[granz]

Hope it works well.

[JKnightandKARR]

@granz @Chris Savage
Well, no signals, no image. Verified voltage at the module n I have 5V to it. Tried Gnd on module .to 5V out from the voltage reg. and got reading, since the module has 8 PTH connected to the functions, I can use them as test points.  Found the pin for the input signal, and I've got a wave form similar to the manual, so the new ULA is clearly working, I've got the output pin and not getting any kinda waveform, other then what looks like noise. so probly start with adjusting the pots. Outta hook it up to my vcr, maybe the tv is the issue as well, so vcr outta help, since I already got a video from it, so far that's what I got.

[MicroNut]

I got an adapter for the TV Out for my ZX81 as well. I really had to fiddle around with the pots to get the display working. The version I got also created two large vertical black bars in the border section. I ended up using a portable 7" black and White TV circ 1980, I picked up at a Salvation Army store, which worked with the TV out instead. So you may have to fiddle around with the pots.

[JKnightandKARR]

I got an adapter for the TV Out for my ZX81 as well. I really had to fiddle around with the pots to get the display working. The version I got also created two large vertical black bars in the border section. I ended up using a portable 7" black and White TV circ 1980, I picked up at a Salvation Army store, which worked with the TV out instead. So you may have to fiddle around with the pots.

Yeah, I outta find my small old lcd screen to try it on... might be my tv as well.

[JKnightandKARR]

I got an adapter for the TV Out for my ZX81 as well. I really had to fiddle around with the pots to get the display working. The version I got also created two large vertical black bars in the border section. I ended up using a portable 7" black and White TV circ 1980, I picked up at a Salvation Army store, which worked with the TV out instead. So you may have to fiddle around with the pots.

Yeah, I outta find my small old lcd screen to try it on... might be my tv as well.

@MicroNut @granz @Chris Savage

https://jknightandkarr.altervista.org/Computers/Fixed.jpg
I got it!! Lil bit o tweaking with signal input and output wires and I got a signal, and the keyboard is needing fixed.

[granz]

@MicroNut @granz @Chris Savage
...
I got it!! Lil bit o tweaking with signal input and output wires and I got a signal, and the keyboard is needing fixed.

Great! Big advance - now to get the keyboard fixed, and the 32K upgrade and you are set to go.

[MicroNut]

I got 2 replacement keyboards from Sell My Retro in the UK Keyboard. They are made of stronger, longer lasting material. They have the UK symbols "Rub Out" rather than "Delete" and "New Line" rather than "Enter". They are easy to replace and work well.

[Chris Savage]

I got it!! Lil bit o tweaking with signal input and output wires and I got a signal, and the keyboard is needing fixed.

Great news! It's time for some Z80 assembly work now! 

[JKnightandKARR]

@MicroNut @granz @Chris Savage
...
I got it!! Lil bit o tweaking with signal input and output wires and I got a signal, and the keyboard is needing fixed.

Great! Big advance - now to get the keyboard fixed, and the 32K upgrade and you are set to go.

Yup, I'm going to try the keyboard from the other unit n see if that works.

I got 2 replacement keyboards from Sell My Retro in the UK Keyboard. They are made of stronger, longer lasting material. They have the UK symbols "Rub Out" rather than "Delete" and "New Line" rather than "Enter". They are easy to replace and work well.

Thanks. I got a one from another unit I can try first. Wish I could get one like this https://www.ginger-electronic.com/en/retro-computer/24-40-zx8-kdlx-keyboard-for-sinclair-zx81-and-zx80.html#/26-model-zx81

I got it!! Lil bit o tweaking with signal input and output wires and I got a signal, and the keyboard is needing fixed.

Great news! It's time for some Z80 assembly work now! 

As soon as my keyboard is fixed, I can try my ZX Spectrum app on my tablet, but need material to figure it out... lol

[Chris Savage]

As soon as my keyboard is fixed, I can try my ZX Spectrum app on my tablet, but need material to figure it out... lol

Okay, PM me your address so I can send you a 62256 SRAM IC (24-pin DIP).

[granz]

I got 2 replacement keyboards from Sell My Retro in the UK Keyboard. They are made of stronger, longer lasting material. They have the UK symbols "Rub Out" rather than "Delete" and "New Line" rather than "Enter". They are easy to replace and work well.

Wow! At $10 for the keyboard, and about $5 for shipping (from the USA,) this is a darned good deal for a TS-1000.

[JKnightandKARR]

I got 2 replacement keyboards from Sell My Retro in the UK Keyboard. They are made of stronger, longer lasting material. They have the UK symbols "Rub Out" rather than "Delete" and "New Line" rather than "Enter". They are easy to replace and work well.

Wow! At $10 for the keyboard, and about $5 for shipping (from the USA,) this is a darned good deal for a TS-1000.

Yaeah. Not bad at all.

[MicroNut]

Thanks. I got a one from another unit I can try first. Wish I could get one like this https://www.ginger-electronic.com/en/retro-computer/24-40-zx8-kdlx-keyboard-for-sinclair-zx81-and-zx80.html#/26-model-zx81

I also have one of those. I had too much trouble trying to get the wiring in the socket. One of these days I'll try one of the ZX81's I have. I have 3 but none of the keyboards work due to age. I only have one replaced. I also have a modern kit someone made that I have put together and has those little switches on it that I play around with.