ID | Pin tied to |
---|---|
0 | 0v |
1 | +5v |
2 | Hsync |
3 | Indeterminate |
ID | Bits |
---|---|
ID0 | 0,1 |
ID1 | 2,3 |
ID2 | 4,5 |
ID3 | 6,7 |
The monitor connector has 4 ID pins (0 to 3). The connections of the 4 ID pins are reported in a bitfield. Each ID pin uses two bits each.
For example the portable module recognises that 1,1,1,1 occur when no lead is connected, and sets mode 27, type 5, sync 0.
If the service is unclaimed RISC OS recognises the following values:
ID0 | ID1 | ID2 | ID31 | Type | Sync | Mode |
---|---|---|---|---|---|---|
H | +5v | +5v | n/a | 0 – TV | Composite | 12 |
+5v | +5v | H | n/a | 1 – Multisync | Composite | 27 |
+5v | 0v | +5v | n/a | 3 – Mono VGA | Separate | 27 |
0v | +5v | +5v | n/a | 3 – Colour VGA | Separate | 27 |
0v | +5v | 0v | n/a | 4 – SVGA | Separate | 27 |
1 Value of ID3 is not used
If even this fails, RISC OS assumes type 0 – TV standard.