please dont rip this site

XMODEM

X-Modem:

Offset            Contents
0                    SOH = Ascii 01
1                    Block #, start with 1, wrap to 0 after FF
2                    Ones complement (XOR with 0xFF) of block #
3-130            128 bytes of data
131                 CRC Checksum of bytes  (carry ignored)
+ Also:

Remember also that the 'window size' is 1. An ASCII ACK must be sent to the sender before the next packet will be sent. If the checksum doesnt match, a NAK must be sent. After 10 NAKs, the transfer should abort. +

Archive:

See also:

file: /Techref/xmodem.htm, 1KB, , updated: 2002/11/29 11:47, local time: 2012/2/3 20:56, owner: JMN-EFP-786,
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Robotics nuts!

Check out http://users.frii.com/dlc/robotics/projects/botproj.htm from Dennis Clark. This guy ROCKS! He has made (and sells but also releases code, docs, etc...) for a number of cool little robotic modules including whiskers, IR proximity detect and remote control, Sonar proximity detect, PWM, Servo, compass. Most of these use the little PIC 12C508 controller which costs basically nothing and is soooo tiny.
The 4 servos, 2400 baud serial servo controller is a wonder of magic and he sells the programmed chip for $8. Wow!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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