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oldman49
February 3rd, 2009, 08:44 AM
Was going through some OLD stuff the other day and came up with the first computer I ever owned! The old KIM-1 was still in the box, along with the power supply and a second board on which I had WIRE WRAPPED 8k x 1 of additional ram!

Saddly the books are long lost and I decided during an earlier home move that I no longer needed the 2 ASR33's which I had used succesfully to interface with the KIM-1. No problem, I thought, I'll just use and old laptop with Hyper Terminal to sub for the ASR33. Now I'll be D@^%^'d if I can find the "simple" addon interface circuit to marry the two.

Can Anyone help? I know there are a couple of you aout there who have had to use this, because I have been finding references to it on sites I have been Googling to try to find the answer. My interests are in reviving this old machine to use in a model Railroading project, I am retired and there isn't a lot of money available to buy ready made interfaces, and it looks like I should be able to use Opto-isolators to do the job. I'm just not the engineer who can design it. Thanx

MikeS
February 3rd, 2009, 03:46 PM
Well, here are the manuals to get you started:

http://www.kim-1.com/docs.html

An RS-232 interface was pretty trivial; just a couple of resistors and an inverting transistor as I recall.

There's a circuit and references here:
http://www.zimmers.net/cbmpics/cbm/kim1/kim-hints.txt

Also read:
http://forum.6502.org/viewtopic.php?t=445&highlight=kim+serial

There are also opto-isolated circuits out there; a little Googling will come up with more than you expected, both KIM information and TTY<>RS-232 conversion.

Check out the KIM User Notes and various other related publications and forums.

Have fun and enjoy!

What's the project?

mike

Luzur
February 4th, 2009, 03:31 AM
damn you are lucky! i want a KIM-1...

Charly
February 8th, 2009, 03:00 AM
damn you are lucky! i want a KIM-1...

Hi Luzur,
did you ever hear about the "micro KIM"-projekt? A nice modern copy of the original from Vince. Of course, not a "real" KIM. But it feels like one and it is 100% software compatible.
Of course, I have both. The original and his modern brother...
Charly

vbriel
February 8th, 2009, 06:08 AM
Oldman,

Books and manuals for the KIM-1 are on the net in pdf form everywhere. To convert the TTY interface to RS232 you need a simple circuit which can be found here:

http://www.kim-1.com/docs.html

Find the kim hints guide and download it. In there is a circuit to convert the TTY to RS232 so you can use that old laptop. When they refer to RUBOUT in the KIM-1 manual, use Enter on your laptop.

I used this circuit on the micro-kim RS232 circuit and used ground instead of -5V and it works great. Most serial ports can handle the voltage swing not going negative. One of these days I'll dig out my KIM-1 again and play with it.

Hope this helps,

Vince

Luzur
February 9th, 2009, 09:40 AM
Hi Luzur,
did you ever hear about the "micro KIM"-projekt? A nice modern copy of the original from Vince. Of course, not a "real" KIM. But it feels like one and it is 100% software compatible.
Of course, I have both. The original and his modern brother...
Charly

yep, ive heard of it, but still it wouldnt be a real KIM-1 with either the Commodore or MOS stamp.

cybertron
February 12th, 2009, 03:28 PM
Blimey! KIM 1's and AIM 65's are rarer than rocking horse doodoo nowadays. They fetch a high price on Ebay.;)

Luzur
February 14th, 2009, 04:05 PM
pure bollocks! guffaw!