A valid kim-1 serial option?

[RonH]

Hi All,
I have been looking various ways to connect my KIM-1 to my laptop.
I see various ways to do this and I think I get the idea. I could start ordering stuff.

But I happen to actually have these TTL/RS232 converters...

https://us.amazon.com/Female-Male-C...o ... 4304466358

... (one of each gender) AND I have this RS232/USB converter...

https://www.amazon.com/dp/B0007T27H8?re ... tle_1&th=1

Will it be safe and effective to use these (with no other parts) to connect my laptop to the KIM-1?
Specifically, can I connect the KIM-1 (on the left) to the TTL/RS232 adapter (on the right) like this....

A-R-|---+---(Vcc)
. . . . . . . .|
. . . . . . . .|
A-S-|---+

A-U-|-------(>)

A-T-|-------(<)

A-21|-----+
. . . . . . . . . .|
. . . . . .. . . . \ switch (closed enables TTY)
. . . . . . . . . .|
A-V |-----+

And then of course...

Connect TTL/RS-232 adapter to RS232/USB adapter.
Connect RS232/USB adapter to the laptop.
What do you think?
Is it safe? Will it work?
I'm holding back because I sure don't want to hurt the KIM-1.
Any advice appreciated!
Ron

[barrym95838]

Hi, RonH.

I'm not adequately qualified to answer your hardware question, but you can make your text diagram easier for us to read by editing your post and surrounding it with

Code: Select all

 and 

respectively.

[RonH]

Oh, that's what you do!
OK, I will.

[BigDumbDinosaur]

Code: Select all

A-R-|---+---(Vcc)
. . . . . . . .|
. . . . . . . .|
A-S-|---+

A-U-|-------(>)

A-T-|-------(<)

A-21|-----+
. . . . . . . . . .|
. . . . . .. . . . \ switch (closed enables TTY)
. . . . . . . . . .|
A-V |-----+

Not making much sense to me.

[6502inside]

You can't connect +5V TTL directly to the KIM, it's expecting 20mA current loop. There are KIM-1 serial boards which will do this conversion for you, or you can wire up one of the off-the-shelf current loop to RS-232 converters. Also run it at 300bps, it tends to drop characters in spurts at higher speeds (the ROM routines were really meant for teletypes).

[BillO]

6502inside is correct, however you could use a couple of opto couplers and possibly a transistor or two to convert between current loop and TTL.

[BillO]

BigDumbDinosaur wrote:

Code: Select all

A-R-|---+---(Vcc)
. . . . . . . .|
. . . . . . . .|
A-S-|---+

A-U-|-------(>)

A-T-|-------(<)

A-21|-----+
. . . . . . . . . .|
. . . . . .. . . . \ switch (closed enables TTY)
. . . . . . . . . .|
A-V |-----+

Not making much sense to me.

The "diagram" refers to the "A" edge connector on the KIM-1.

[BigEd]

Thanks for the diagram Ron. Let me try the formatting:

RonH wrote:

Code: Select all

A-R-|---+---(Vcc)
        |
        |
A-S-|---+

A-U-|-------(>)

A-T-|-------(<)

A-21|-----+
          |
           \ switch (closed enables TTY)
          |
A-V |-----+

Ron

As noted, the | characters are the edge of the KIM-1, function labels to the left, connections and purposes to the right.