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-===============================================================
-== BT8XXGPIO driver ==
-== ==
-== A driver for a selfmade cheap BT8xx based PCI GPIO-card ==
-== ==
-== For advanced documentation, see ==
-== http://www.bu3sch.de/btgpio.php ==
-===============================================================
-
-
-A generic digital 24-port PCI GPIO card can be built out of an ordinary
-Brooktree bt848, bt849, bt878 or bt879 based analog TV tuner card. The
-Brooktree chip is used in old analog Hauppauge WinTV PCI cards. You can easily
-find them used for low prices on the net.
-
-The bt8xx chip does have 24 digital GPIO ports.
-These ports are accessible via 24 pins on the SMD chip package.
-
-
-==============================================
-== How to physically access the GPIO pins ==
-==============================================
-
-The are several ways to access these pins. One might unsolder the whole chip
-and put it on a custom PCI board, or one might only unsolder each individual
-GPIO pin and solder that to some tiny wire. As the chip package really is tiny
-there are some advanced soldering skills needed in any case.
-
-The physical pinouts are drawn in the following ASCII art.
-The GPIO pins are marked with G00-G23
-
- G G G G G G G G G G G G G G G G G G
- 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
- 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
- | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
- ---------------------------------------------------------------------------
- --| ^ ^ |--
- --| pin 86 pin 67 |--
- --| |--
- --| pin 61 > |-- G18
- --| |-- G19
- --| |-- G20
- --| |-- G21
- --| |-- G22
- --| pin 56 > |-- G23
- --| |--
- --| Brooktree 878/879 |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| |--
- --| O |--
- --| |--
- ---------------------------------------------------------------------------
- | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
- ^
- This is pin 1
-