Capacitor replacement on Kaypro 16/2

[Capacitor replacement on Kaypro 16/2]

Okay, thank you! I was a little uncertain as to whether it would be a good idea to use a close substitute. Would 620 or 680pf work as well?

[Capacitor replacement on Kaypro 16/2]

Here you go. One picture is of the keyboard logic chip, the other is of the 640pf capacitor.

[Capacitor replacement on Kaypro 16/2]

So I got a Kaypro 16/2 computer and it boots up to DOS just fine, but the keyboard does nothing. I always get a "check keyboard" message. At first I thought it was the keyboard itself, but now I know that there is something wrong with the keyboard logic on the processor board. It is either that 1. the 74LS322 chip is bad, and that I can buy a replacement or 2. a tantalum capacitor is bad. The capacitors in question are 640 picofarads, which are a weird size and I cant find replacements anywhere. My question is, could I use a 620 or 650pf capacitor instead, or is there another solution?
I found a schematic of the 16/2 which I've attached below.
Any help would be greatly appreciated!

kaypro16.pdf

[Fair price for vintage computers on auction?]

These two computers are up for auction in my area, Kaypro 16/2 and IBM 5155. Descriptions say that the Kaypro screen turns on but is faint, and the IBM screen turns on briefly and then back off. What would be a fair price to pay for each?

[Snes Backup device]

On 2/18/2021 at 5:04 AM, bluejay said:

From what I can gather that floppy drive is a generic IDE/ATAPI drive for PCs... I wonder if you could replace it with an Iomega Zip drive, or maybe hook up an external one to the parallel port.

 

I'm super jealous of you... I really want that Game Doctor. Loading SNES games from floppy is very intriguing. Maybe I'll get one someday. Have you tried downloading games off the web?

I tried a zip drive and it doesn't link properly.
if you want to get a game copier, you should try to get one of these
https://www.ebay.com/itm/MGH-Multi-Game-Hunter-Multi-console-version-SNES-Sega-Genesis-Mega-Drive/233857767169?hash=item3673025701:g:EKkAAOSw15pf~pVY
they work with both snes and genesis games. There are others like the double pro fighter, but I wouldn't recommend getting one of those because they break easily.

[help upgrading my coco 2]

thanks
I'm kind of putting this project on hold.
I'm only a high school student and I'm not going to be working for another few months, so I might post again when I'm ready to invest more time and money.

[help upgrading my coco 2]

Thank you so much!

[Coco 2 clicking wont turn on]

Ok.

[help upgrading my coco 2]

This is my motherboard, RAM and eprom slot.

[help upgrading my coco 2]

I have a 26-3134, and I think it has a 24 pin socket, I'll have to check. Yes I would like enough ram to upgrade to 64k.
How much will the eprom cost?

[help upgrading my coco 2]

Nice. I have someone who I'm going to ask to help me. I just need to know where I can buy those chips. Also, @MrDave if you are offering an eprom, I would be happy to buy one.

[Coco 2 clicking wont turn on]

I got a click! That explains a lot. Last night when I first used it, the video quality was really bad. I guess its just the RF unit going bad.
Is there a way I can do an AV mod on it?

[help upgrading my coco 2]

I have the 26-3134. Sounds like it will require soldering. Ugh. 

[Coco 2 clicking wont turn on]

It is connected correctly. Im using a NES rf switch because the one it came with didnt work very well. And this all worked yesterday.
And it didnt click when I pressed power before.

[Coco 2 clicking wont turn on]

so what are you saying is wrong?

[I'm a little afraid to burn games]

I would really like something that doesn't involve taking the Dreamcast apart

[Coco 2 clicking wont turn on]

My coco 2 that I just bought yesterday isn't working anymore. I plug it in and press the power switch, but it just makes a click noise and does nothing. Please help!

[help upgrading my coco 2]

I just bought a Coco 2 (sadly only 16k). I would like to upgrade it to 64k, but I don't want to totally screw up my machine. I would also like to install extended color basic. Are there and tutorials on how I can do this?

[Port Commodore or Spectrum game to SNES]

Ok. I didn't think the SMS could handle that. Also, I didn't know there was a CPC version. 

[Port Commodore or Spectrum game to SNES]

I have no idea how to program the Snes, but I hope to learn programming for some console some day. I just wanted to see if it was possible.

[Port Commodore or Spectrum game to SNES]

Could it be ported to any other systems? 

[Port Commodore or Spectrum game to SNES]

I really like the game Castle Master because of its early 3d graphics. It was originally released on the Commodore 64, ZX Spectrum, Amiga, Atari ST, and MS-DOS. The C64 and Spectrum versions look pretty simple, so I thought it would be cool to port the C64 or spectrum version to work on a SNES. Is this possible? If so would it require an enhancement chip like the DSP-1 or Super FX chip?
Thanks

 

[The Official "Thrift finds" Thread]

Thanks, good to know.

[The Official "Thrift finds" Thread]

It didn't come with any controllers, but I'm happy that I got an OK deal.
I got one NES to work and the other one might be broken, but I haven't cleaned it yet.
There was another lot in the auction for an Nintendo 64 with 6 official controllers, 5 3rd party controllers and 12 games (11 controllers total)
It sold for a ridiculous price of 250 dollars.

[The Official "Thrift finds" Thread]

I don't know if this counts as a thrift but I think I got a good deal.
I won a lot of 2 toaster NESes and games from my local auction. I payed a total of 80 bucks for the lot.