Serieporten och *host* Quick Basic

Tror det var under förra istiden jag gjorde nått sånt men troligen är det nått sånt här

OPEN "COM1:9600,n,8,1,CS,DS,RS" AS#1

input och print blabla

CLOSE #1

Behöver du mera info?

Hmm ok men det är väll lika som med parallelporten om jag fattar den här sidan rätt. http://www.techlib.com/electronics/serialport.htm

Here is how the hardware works:

The serial port (com port) on your computer may be used as an abbreviated parallel port with three pins dedicated to output (pins 3,4 and 7) and four pins to input (pins 1,6,8 and 9). Pin 5 is ground and pin 2 is a serial pin that is not used. These pins are bipolar in nature, with current-limited swings as high as +-12 volts with the negative voltage indicating a logic low. Each com port has an 8 byte Input/Output address range that may be determined by looking at the properties of the com port under the system properties tab of the control panel. Com1 data range is 03F8 to 03FF, for example:

Bit Values
128 - 64 - 32 - 16 - 8 - 4 - 2 - 1

03F8 03F9 03FA 03FB 03FC 03FD 03FE 03FF
x x x x x x x x x x x x x x x x x x x x x x x x x 3 x x x x x x x x x x x x x x 7 4 x x x x x x x x 1 9 6 8 x x x x x x x x x x x x

We are only interested in 7 of the bits (in red); the bits for the three output pins and four input pins. The red numbers in the above chart represent the serial port 9-pin connector pin numbers. The data in the '64' bit of 03FB sets pin 3, the '1' and '2' bit of 03FC set pins 4 and 7, and the four MSBs of 03FE contain the four inputs from pins 8,6,9 and 1. Using the outputs is quite simple: set an output bit high and the pin goes high. Just read the four input bits to directly determine the logic levels on the input pins. A simple way to get access to these registers is to use the IN and OUT commands in Qbasic. Just remember that each bit has a value determined by its position in the byte. For example, to set pin 3 high, you would output a 64 to 03FB and to read pin 6 you would look for a 32 in the hex value in 03FE ( '32 AND 03FE' will evaluate as either 32 or 0 depending on whether that bit is a 1 or 0). You could set both pins 4 and 7 high by outputting a 3 into 03FC since 3 is '11' in binary. The output bytes may be read back with the IN command to verify that the output data is correct.

Låt gamla trådar vila.

*tråd låst*