Differences
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| Both sides previous revisionPrevious revision | Last revisionBoth sides next revision | ||
| documentations:devices:6821 [2018/08/17 09:08] – [MO System PIA] pulkomandy | documentations:devices:6821 [2018/08/17 09:09] – [TO System PIA] pulkomandy | ||
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| Line 66: | Line 66: | ||
| ==== TO " | ==== TO " | ||
| - | === Data port A === | + | === Data port A (E7C8) |
| == PA0: KTEST == | == PA0: KTEST == | ||
| Line 74: | Line 74: | ||
| These bits are wired to printer port D1-D7. Bit 0 is PB0 (this would have been too simple!) | These bits are wired to printer port D1-D7. Bit 0 is PB0 (this would have been too simple!) | ||
| - | === Data port B === | + | === Data port B (E7C9) |
| == PB0-PB1: printer missing bits == | == PB0-PB1: printer missing bits == | ||
| Line 106: | Line 106: | ||
| Seriously, this system is a mess. Use the new banking from the gate array if you can. | Seriously, this system is a mess. Use the new banking from the gate array if you can. | ||
| - | === Control port A === | + | === Control port A (E7CA) |
| == CA1: video incrustation sync == | == CA1: video incrustation sync == | ||
| This is connected to the video incrustation CLRG signal. The only use is detecting that the signal is available from software. This is useful, because switching the video incrustation on without this would crash the machine. | This is connected to the video incrustation CLRG signal. The only use is detecting that the signal is available from software. This is useful, because switching the video incrustation on without this would crash the machine. | ||
| Line 116: | Line 116: | ||
| Triggered when the lightpen sensor detects the screen refresh. | Triggered when the lightpen sensor detects the screen refresh. | ||
| - | === Control port B === | + | === Control port B (E7CB) |
| ==== "Sound and Games" PIA ==== | ==== "Sound and Games" PIA ==== | ||
