Previous Thread
Next Thread
Print Thread
Page 2 of 3 1 2 3
Dagarman #118994 04/16/21 02:58 PM
Joined: Dec 2010
Posts: 46
D
Member
OP Offline
Member
D
Joined: Dec 2010
Posts: 46
The 5K potentiometer is part of the audio cassette interface circuits. I don't know if it is required for the emulation.

I didn't think to ask the author that submitted the .wav file to try it on his kim-1 but I will ask him and hope he still has working hardware.

Dagarman #118995 04/16/21 04:26 PM
Joined: Jun 2001
Posts: 457
O
Senior Member
Offline
Senior Member
O
Joined: Jun 2001
Posts: 457
The potentiometer is used to tune the free running frequency of the pll between 1900Hz and 6200Hz. It should be set so that it's in the middle between the two frequencies the kim actually uses.

It's a seriously complicated circuit to simulate, and it's part of the code I don't want to look at at this point. But it explains the system being able to pick up data from an otherwise not so nice audio file.

Dagarman #118996 04/16/21 04:37 PM
Joined: Jun 2001
Posts: 457
O
Senior Member
Offline
Senior Member
O
Joined: Jun 2001
Posts: 457
FYI, the two peaks seem to be a 2500 and 3600Hz, so the potentiometer is probably set around 2270 ohm, giving a 3050Hz frequency.

Dagarman #119205 05/18/21 03:37 AM
Joined: May 2021
Posts: 7
Likes: 1
T
Member
Offline
Member
T
Joined: May 2021
Posts: 7
Likes: 1
I'm the KIM-Venture author. Didn't get my KIM-1 working (got a bad 7-segment LED) so I could try loading the files from cassette, but I did manage to transcribe the binary files. Checked them over pretty well, I think; used an online disassembler to verify the binary creates the same code as in the listing--but remember that the original code was hand-assembled, so there's an element of mental bootstrapping here... (I had no assembler back in the 1970s.)

I'm new to this forum, and not sure how best to supply the text files of the binary so others here can try it on a KIM simulator. Suggestions?

Dagarman #119206 05/18/21 04:36 AM
Joined: Aug 2004
Posts: 1,444
Likes: 6
Very Senior Member
Offline
Very Senior Member
Joined: Aug 2004
Posts: 1,444
Likes: 6
This forum doesn't permit uploading of anything, so you'll have to link to them on another site.

Robbbert #119210 05/19/21 03:53 AM
Joined: May 2021
Posts: 7
Likes: 1
T
Member
Offline
Member
T
Joined: May 2021
Posts: 7
Likes: 1
Originally Posted by Robbbert
This forum doesn't permit uploading of anything, so you'll have to link to them on another site.

OK, then, here's a Dropbox link to the Word doc containing the binaries for the three files: https://www.dropbox.com/s/vawy3j81dpwzk52/KIM-Venture%20program%20segment%20binaries.docx?dl=0

Hope somebody can check them out on a KIM sim and tell me if the can get KIM-Venture to work.

1 member likes this: robcfg
Dagarman #119216 05/20/21 01:32 AM
Joined: Aug 2004
Posts: 1,444
Likes: 6
Very Senior Member
Offline
Very Senior Member
Joined: Aug 2004
Posts: 1,444
Likes: 6
Thought I'd try this out. Firstly, the cassette sounds like it was done by using a microphone up against a speaker. That never works, and it didn't work this time either. The recording AGC made almost all of the sound practically inaudible.

So, I used the word document, and copied the bytes to Notepad, inserted the paste codes, and used the paste facility to upload them into the kim1 emulation.

Now we come to limitations of the manual. It says how to start the game, but there's nothing about what should happen next, what kind of displays to expect, or how to play it.

So I started the game, the display went blank for a while, and when I came back it said 0000 84 - whatever that may mean.

Robbbert #119217 05/20/21 02:53 AM
Joined: May 2021
Posts: 7
Likes: 1
T
Member
Offline
Member
T
Joined: May 2021
Posts: 7
Likes: 1
Sorry! A glaring oversight on my part!

I have to track down the Game Instructions that were written by the folks that arranged to publish KIM-Venture for me in a marketable package. They took my explanatory info and created something they thought was more entertaining. I will find, scan, and link to those pages here shortly.

(But "0000 84" doesn't look promising...)

Dagarman #119218 05/20/21 03:36 AM
Joined: May 2021
Posts: 7
Likes: 1
T
Member
Offline
Member
T
Joined: May 2021
Posts: 7
Likes: 1
Here's a link to the KIM-Venture game instructions. https://www.dropbox.com/s/buvaqwpp233b1rw/KIM-Venture%20game%20instructions.pdf?dl=0
Note that extensive use is made of the programmer's ability to independently control each of the segments of the KIM-1 display, thus allowing "text-like" information to be presented to the user/player.
For example, "You are in a forest" would be shown something like this:

First the display would show (trying to imitate 7-segment displays here...)
" u r in"
followed by a second display,
"ForESt".

Then, to prompt for the user's next input, the display would show just a question mark (this would look like a numeral "2" without the horizontal bottom line)...
" ? "

Dagarman #119220 05/20/21 05:04 PM
Joined: Aug 2004
Posts: 1,444
Likes: 6
Very Senior Member
Offline
Very Senior Member
Joined: Aug 2004
Posts: 1,444
Likes: 6
I guess it isn't working, or there's a mistake in the word doc ... it's hard to say.

The manual still doesn't say what should appear at first start. Further, if you happened to miss the text and only saw the "?", how would you get the text back?

Page 2 of 3 1 2 3

Link Copied to Clipboard
Who's Online Now
2 members (Duke, Vas Crabb), 45 guests, and 2 robots.
Key: Admin, Global Mod, Mod
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Forum Statistics
Forums9
Topics8,957
Posts117,735
Members4,994
Most Online890
Jan 17th, 2020
Forum Host
These forums are hosted by www.retrogamesformac.com
Forum hosted by www.retrogamesformac.com