My Newton I Build - blinking @ with \ above it

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Joined: Jan 4 2015
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Hi,

After some initial difficulties with the video section of my Newton I, I managed to find the culprit with the help of the 2513 datasheet. I've got one non-working and one semi-working 2504v(maybe). I removed the former chip and now got the alternating characters of ^'s and blinking @'s. Clear screen works and displays the blinking @ sign at the upper left corner of the screen. The video seems to be half-working. Smile Well atleast I got the blinking/flashing @.

While I wait for the new 2504v's to arrive I thought I could just proceed with the microcomputer section. And I did and resetting seems to work with the blinking '@' sign and a '\' above it. Yoohoo!Smile

Now I need a keyboard to test it further. I'm thinking of using an Arduino board to interface a ps2 keyboard but I'm not sure yet how. Any ideas? On the Apple I keyboard, what's the STROBE use?

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speedyG's picture
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Joined: Nov 16 2011
Posts: 2376
Re: My Newton I Build - blinking @ with \ above it

Hello snazzify,
first off all congat´s....
there are several solutions out there for adapting a keyboard to the Apple I....

just short explenation....
the strobe is used for communication between the Apple 1 mainboard and the keyboard....

if you press a key at the keyboard the value of the pressed key is kept in the buffer of the
keyboard until it is picked up from the logic of the mainboard ( reading that value ) and then
the mainboard logic signaling to the keyboard that the character has been read
the strobe signals to the keyboard that it may clear the buffer by one character and put
next character ready for pickup / reading.

speedyG

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Re: My Newton I Build - blinking @ with \ above it

Thanks speedyG!

I've tested a PS/2 keyboard using Arduino Uno and it seems to work. Just need to get a ribbon cable with connector for the keyboard socket instead of jumper cables. I've looked at eBay but I'm not sure which to find. Can anyone tell me what cable and connector to use?

Good day!

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Re: My Newton I Build - blinking @ with \ above it

I´d need pic of the used aruino unit and present connetor to give recommendation.

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

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Re: My Newton I Build - blinking @ with \ above it

I meant the connector or header connector that connects to the Apple I board's keyboard socket.

Please see picture at https://flic.kr/p/Feyu5Z

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Re: My Newton I Build - blinking @ with \ above it

I was aware of the connector at the mainboard -
my question targeted to the connector at the arduino....

just to give a link to the connector at the mainbaord:
in Europe:
http://www.reichelt.de/Leiterplattenverbinder-IC-Sockel-/KK16025C/3/index.html?&ACTION=3&LA=2&ARTICLE=9382&GROUPID=5213&artnr=KK16025C
in USA:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_42674_-1

speedyG

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

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Re: My Newton I Build - blinking @ with \ above it

Thanks.

Right now I'm just using jumper cables to connect the arduino uno to the keyboard socket on the Newton I board. It will be the same socket and connector on both ends.

Second link does not load from here. First link, yes that is the connector I'm looking but what is it called? I don't understand the language?16pin dual inline ic socket? Smile

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Re: My Newton I Build - blinking @ with \ above it

in USA:
http://www.jameco.com/

and enter in search field:
Part no.: 42674

thats part number from the Jameco catalog

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

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Posts: 68
Re: My Newton I Build - blinking @ with \ above it

Jameco will not load from here. Maybe not available here in the Philippines yet?

It would be nice if I can find something similar to this https://flic.kr/p/EgTwUy

speedyG's picture
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Re: My Newton I Build - blinking @ with \ above it

Well at least you can google by yourself electronic supply shops in the phillipines.....
i´m sure that there are local dealers availiable and that some of them offer shopping by internet...

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....