Differences

This shows you the differences between two versions of the page.

--- io [2021/08/26 19:16] – created pulkomandy
+++ io [2021/08/26 20:10] – pulkomandy
@@ Line 19: / Line 19: @@
 ===== Other =====
-  * IOA11: ?
+  * IOA11: Only a pull down resitor?
-  * IOA12: ?
+  * IOA12: Only a test point on the motherboard?
+====== Port B ======
+===== ROM and cartridge =====
+  * IOB0: extra address bit for the cartridge port, access second half of ROM
+  * IOB1: Set to 0 to enable cartridge ROM
+  * IOB2: Set to 0 to enable internal ROM
+===== Power control =====
+  * IOB3: Labelled "RESTART", not used?
+  * IOB4: "A/D", related to the ADC?
+  * IOB5: Voltage detect (ADC measurement of battery level or power supply)
+  * IOB6: Pulled to ground by the ON button
+  * IOB7: Pulled to ground by the OFF button
+====== Port C ======
+===== Configuration =====
+^Language^IOC3^IOC2^IOC1^IOC0^
+|Italian | 0  | 0  | 1  | 0  |
+|Chinese | 0  | 1  | 1  | 1  |
+|Polish  | 1  | 0  | 0  | 0  |
+|Dutch   | 1  | 0  | 0  | 1  |
+|German  | 1  | 0  | 1  | 1  |
+|Spanish | 1  | 1  | 0  | 0  |
+|French  | 1  | 1  | 0  | 1  |
+|UK English| 1| 1  | 1  | 0  |
+|US English| 1| 1  | 1  | 1  |
+IOC4: if 1: show logo animation at boot
+===== Power control =====
+  * IOC6: audio output enablw
+  * IOC7: Power control
+===== Controllers =====
+  * IOC8: Controller A request to send
+  * IOC9: Controller B request to send
+  * IOC10: Controller A clear to send
+  * IOC12: Controller B clear to send
+  * IOC13: UART Rx (from controller)
+  * IOC14: UART Tx (to controller)
+  * IOC15: Controller power?