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April 26, 2012 20:47
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Studio Mintaka's CrissCross Cable
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_ _ | |
(_) _ | | | |
____ _ ____ _| |_ _____| | _ _____ | |
| \| | _ (_ _|____ | |_/ |____ | * | |
| | | | | | | || |_/ ___ | _ (/ ___ | * | |
|_|_|_|_|_| |_| \__)_____|_| \_)_____| * | |
STUDIO MINTAKA : MANUFACTURER ID 0xABAD1DEA | |
___ ____ ____ ___ ___ ___ ____ _____ ___ ___ | |
/ __)( _ \(_ _)/ __)/ __)\ / / __)( _ \( _ )/ __)/ __) | |
( (__ ) / _)(_ \__ \\__ \ X ( (__ ) / )(_)( \__ \\__ \ | |
\___)(_)\_)(____)(___/(___// \ \___)(_)\_)(_____)(___/(___/ | |
"CRISSCROSS" CROSSOVER CABLE: ITEM ID 0xCC00CC00 | |
REVISION 0x0 | |
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CRISSCROSS is a simple cable with a logic board that attaches two separate | |
DCPU-16 systems and allows them to send and receive packets of 256 words. | |
INTERRUPTS | |
0 B - SETOUTGOING | |
1 B - SETINCOMING | |
2 - READY | |
3 - RECEIVE | |
Using it couldn't be simpler. First, make sure both computers are powered off, | |
and securely connect both ends of the CRISSCROSS to their serial ports. | |
From within your software, call interrupt 0 (SETOUTGOING) with a pointer in | |
register B to the 256-word region you wish the other end to be able to read | |
from. This is your OUTGOING buffer. | |
Next, call interrupt 1 (SETINCOMING) with a pointer in register B to the 256- | |
word region that the other end will write into. This is your INCOMING buffer. | |
Call interrupt 2 (READY) when you are currently not mucking around with your | |
OUTGOING and it may be safely copied. The CRISSCROSS will immediately copy | |
OUTGOING into its internal buffer on the logic board. | |
And whenever you want, call interrupt 3 (RECEIVE) to have the CRISSCROSS send | |
you the other end's most recently READY'd OUTGOING into your INCOMING. If it | |
has not changed, this will return immediately. | |
Calling interrupt 2 without having called interrupt 0 will cause CRISSCROSS to | |
store all zeroes. Calling interrupt 3 without having called interrupt 1 will | |
result in no data being written to your RAM. | |
If the other end calls interrupt 3 before you have set your OUTGOING, it will | |
RECEIVE all zeroes. | |
SETOUTCOMING and SETINCOMING may be raised at any time to change your current | |
buffer locations. | |
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Coming soon: the MINTAKA CLOVERWHEEL star topology router and the MINTAKA | |
GREENBANK radio tranceiver! | |
by Abigail van der Polder, STUDIO MINTAKA | |
extracanonical: | |
actually by Melissa | |
@0xabad1dea / abadidea on freenode & reddit |
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