Organization

Interfacing a SWTP GT-6144 to an Apple I

INTERFACING A SWTP GT-6144 GRAPHICS KIT TO AN APPLE I MICROPROCESSOR

 

The STWP graphics board displays a picture made of a 64 X 96 array of rectangles. The schematic I've enclosed is pretty straigt forward. The .006 MFD capacitor connected between pins 6 and 7 of the 74123 controls the length of time that must elapse between each output of date to the GT-6144. I've been unable to load the date faster than the .005 capacitor will allow.

GT-6144 Graphics Board

The Apple I's onboard video memory was capable of displaying text only. With the addition of the GT-6144 Graphics Board, the Apple I could display primitive black and white graphics.

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Datanetics pricing

Datanetics

February 16, 1978
78-DH-S1558

Mr. Joe Torzewski
51625 Chestnut Road
Granger, IN 46530

Datanetics Corp Keyboard

Apple I - Datanetics keyboard

The keyboard most commonly used with the Apple 1 was the Datanetics Corp keyboard.

Apple I - Datanetics logo

The Datanetics Corp logo.

Apple I - Datanetics date

Expanding the Memory to 20k

INSTRUCTIONS FOR EXPANDING THE APPLE-1 MEMORY TO 20K

The procedure consists of replacing one row of type 4096 memory chips (the X
row) by 4116 chips, each of which has a capacity of 16384 bytes rather than

Upgrading the Memory

Apple I board

Note the bread board area at the left of the top-most blue capacitor.

Apple I - breadboard area

The 74153 and 74139 chips on the bread board area on the Apple 1 computer, as mentioned on the next page.

Drennan on the KIMSI

Richard Drennan
4590 Oberlin Avenue
Lorain, Ohio 44053

Dear Joe:

KIMSI Connections

This paper shows the connections between the Apple 1 computer and the extension (expansion) card for the Kim-1 computer.

KIMISI Connections sheet

KIMSI

This board connected to the Apple 1 via the 44 Pin Bus and allowed S-100 cards to be connected.

The MOS Technology Kim-1 was a 6502 cpu based single-board computer with 1k of memory and a keypad for input.

Homebrew EPROM card

Apple I - eprom card back

Apple I - eprom card front Apple I - eprom card back 2

Joe writes:

"I built an EPROM card to use in the 44 pin bus in my Apple 1 computer. It had on it two 2716 EPROM's. The 2716 was a 2k memory chip. I had a new monitor and a dis-assembler on the chips. To use this card I had to first unplug the two Apple Proms on the motherboard. As you can see I did not solder the sockets, but wire wrapped the card instead."

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