CircuitGizmos

Electronic Products for Creative Minds

CGVGAKBD1 Technical Information

CGVGAKBD1 Technical Information

Connection between the CGMMSTICK1 30-pin connector and VGA, keyboard, and RCA jack (composite video).

Not shown in the schematic is J5, which parallels all of the connections of J1 from pin 11 to pin 30.

The screen resolution for composite display in PAL (default) mode is 304 horizontal, and 216 vertical. Screen resolution in NTSC is 304 horizontal, and 180 vertical.

Use CONFIG COMPOSITE to set either PAL or NTSC. NTSC is used for composite video in the United States.

Composite mode is set using a jumper (or a wire) in place on J4 on the CGMMSTICK which is sampled on power up.

The CGVGAKBD1 board paired up with a CGMMSTICK1 built on a wiring board.

Connections from The CGMMSTICK to CGVGAKBD board should be from pin 1 to pin 1, 2 to 2, etc.

The CGMMSTICK and CGVGAKBD combination can be used as a stand-alone computer.

CGMMSTICK1 Pinout

 

J1 Pin Function Analog Digital In Freq In Period In Count In Digital Out Open Collector 5V Tolerant Additional Function
SETPIN:

—>

 1 2 3 4 5 8 9    
1 Reg 3.3V                  
2 Video1                  
3 Video2                  
4 NC                  
5 VSYNC                  
6 KBDDATA                  
7 +5V                  
8 KBDCLK                  
9 GROUND                  
10 HSYNC                  
11 I/O 1 Analog In Digital In       Digital Out      
12 I/O 2 Analog In Digital In       Digital Out      
13 I/O 3 Analog In Digital In       Digital Out      
14 I/O 4 Analog In Digital In       Digital Out      
15 I/O 5 Analog In Digital In       Digital Out      
16 I/O 6 Analog In Digital In       Digital Out      
17 I/O 7 Analog In Digital In       Digital Out      
18 I/O 8 Analog In Digital In       Digital Out      
19 I/O 9 Analog In Digital In       Digital Out      
20 I/O 10 Analog In Digital In       Digital Out      
21 I/O 11   Digital In Freq In Period In Count In Digital Out Open Collector 5V Tolerant  
22 I/O 12   Digital In Freq In Period In Count In Digital Out Open Collector 5V Tolerant  
23 I/O 13   Digital In Freq In Period In Count In Digital Out Open Collector 5V Tolerant  
24 I/O 14   Digital In Freq In Period In Count In Digital Out Open Collector 5V Tolerant  
25 I/O 15   Digital In       Digital Out Open Collector 5V Tolerant Serial 1 Receive
26 I/O 16   Digital In       Digital Out Open Collector 5V Tolerant Serial 1 Transmit
27 I/O 17   Digital In       Digital Out Open Collector 5V Tolerant Serial 1 RTS
28 I/O 18   Digital In       Digital Out Open Collector 5V Tolerant Serial 1 CTS
29 I/O 19   Digital In       Digital Out Open Collector 5V Tolerant Serial 2 Receive
30 I/O 20   Digital In       Digital Out Open Collector 5V Tolerant Serial 2 Transmit

 

CGMMSTICK1 SD Card Insertion and Removal

CGMMSTICK1 SD Card Insertion and Removal

Card Insertion

The top of the SD card holder shell slides to the side slightly to open.

The micro SD card connector has a little clam shell lid. It needs to be slid to one side to open, then back to lock closed.
The photos above show opening the micro SD clam shell.

SD card insertion is simple.

Card Removal

The cover for the SD card holder flips closed.

The photos above show closing the micro SD clam shell.