summaryrefslogtreecommitdiffstats
path: root/converter/ibm4704_usb
diff options
context:
space:
mode:
Diffstat (limited to 'converter/ibm4704_usb')
-rw-r--r--converter/ibm4704_usb/config.h4
-rw-r--r--converter/ibm4704_usb/ibm4704.txt6
2 files changed, 5 insertions, 5 deletions
diff --git a/converter/ibm4704_usb/config.h b/converter/ibm4704_usb/config.h
index 4f267b3b7a..d9d8d39bc0 100644
--- a/converter/ibm4704_usb/config.h
+++ b/converter/ibm4704_usb/config.h
@@ -51,8 +51,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#define IBM4704_DATA_DDR DDRD
#define IBM4704_DATA_BIT 0
-/* Pin interrupt on rising edge */
-#define IBM4704_INT_INIT() do { EICRA |= ((1<<ISC11)|(0<<ISC10)); } while (0)
+/* Pin interrupt on rising edge of clock */
+#define IBM4704_INT_INIT() do { EICRA |= ((1<<ISC11)|(1<<ISC10)); } while (0)
#define IBM4704_INT_ON() do { EIMSK |= (1<<INT1); } while (0)
#define IBM4704_INT_OFF() do { EIMSK &= ~(1<<INT1); } while (0)
#define IBM4704_INT_VECT INT1_vect
diff --git a/converter/ibm4704_usb/ibm4704.txt b/converter/ibm4704_usb/ibm4704.txt
index 9c4895d922..50d8c98b08 100644
--- a/converter/ibm4704_usb/ibm4704.txt
+++ b/converter/ibm4704_usb/ibm4704.txt
@@ -57,15 +57,15 @@ Keyboard to Host
----------------
Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part.
- ____ __ __ __ __ __ __ __ __ __ ________
- Clock \____/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
+ ____ __ __ __ __ __ __ __ __ __ _______
+ Clock \_____/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
____ ____ ____ ____ ____ ____ ____ ____ ____ ____
Data ____/ X____X____X____X____X____X____X____X____X____X________
Start 0 1 2 3 4 5 6 7 P Stop
Start bit: can be long as 300-350us.
Inhibit: Pull Data line down to inhibit keyboard to send.
-Timing: Host reads bit while Clock is hi.
+Timing: Host reads bit while Clock is hi.(rising edge)
Stop bit: Keyboard pulls down Data line to lo after 9th clock.