Differences
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| documentations:devices:6821 [2015/03/01 17:52] – [Sound and Games PIA] pulkomandy | documentations:devices:6821 [2018/08/17 09:08] – [MO System PIA] pulkomandy | ||
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| Line 43: | Line 43: | ||
| ===== Uses ===== | ===== Uses ===== | ||
| ==== MO " | ==== MO " | ||
| - | === data port A === | + | === data port A (A7C0) |
| * bit 0: /FORME - Switch the screen RAM mapping between pixel and attribute RAMs | * bit 0: /FORME - Switch the screen RAM mapping between pixel and attribute RAMs | ||
| * bits 1-4: border color (R,G,B,P) | * bits 1-4: border color (R,G,B,P) | ||
| Line 52: | Line 52: | ||
| Bit 7 is low when no tape drive is plugged, and high when there is one. The monitor loading and saving code checks for this to detect the tape drive. | Bit 7 is low when no tape drive is plugged, and high when there is one. The monitor loading and saving code checks for this to detect the tape drive. | ||
| - | === data port B === | + | === data port B (A7C1) |
| * bit 0: sound output | * bit 0: sound output | ||
| * bits 1-3: keyboard column to scan | * bits 1-3: keyboard column to scan | ||
| Line 58: | Line 58: | ||
| * bit 7: state of key selected by the column and line | * bit 7: state of key selected by the column and line | ||
| - | === Control ports === | + | === Control ports (A7C2, A7C3) === |
| * CA1: lightpen interrupt (IRQA is wired to 6809 FIRQ) | * CA1: lightpen interrupt (IRQA is wired to 6809 FIRQ) | ||
| * CA2: tape drive motor control (output) | * CA2: tape drive motor control (output) | ||
| Line 120: | Line 120: | ||
| Available as an expansion for the TO7, TO7/70, TO9 and MO5, this is built-in for the other machines. | Available as an expansion for the TO7, TO7/70, TO9 and MO5, this is built-in for the other machines. | ||
| + | |||
| + | < | ||
| === Data port A === | === Data port A === | ||
| Line 131: | Line 133: | ||
| |PA6| | |Left | | |PA6| | |Left | | ||
| |PA7| | |Right| | |PA7| | |Right| | ||
| + | |||
| + | < | ||
| === Data port B === | === Data port B === | ||
| Line 143: | Line 147: | ||
| |PB6|Joy0 button 1 |YA | | | |PB6|Joy0 button 1 |YA | | | ||
| |PB7|Joy1 button 1 | | | | |PB7|Joy1 button 1 | | | | ||
| + | |||
| + | </ | ||
| === Control ports === | === Control ports === | ||
