Monitor Lead IDs (changes)
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Programmer's Reference Manuals
» Part 16 – Service Calls
» Service_MonitorLeadTranslation
» Monitor Lead IDs
Monitor Lead IDs
| ID | Pin tied to |
|---|---|
| 0 | 0v |
| 1 | +5v |
| 2 | Hsync |
| 3 | Indeterminate |
The monitor lead ID is an 8-bit value which is split into four 2-bit fields.
| Bits | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
|---|---|---|---|---|---|---|---|---|---|
| ID0 | Field | ID2 | ID1 | ID0 | |||||
| ID1 | 2,3 | ||||||||
| ID2 | 4,5 | ||||||||
| ID3 | 6,7 | ||||||||
The subfields correspond to the 4 ID pins that are present in the monitor lead. The value of each field indicates what that pin is connected to.
| Value | Pin tied to |
|---|---|
| 0 | 0v |
| 1 | +5v |
| 2 | Hsync |
| 3 | Indeterminate |
Notes
The monitor version connector has 4 ID pins (0 to 3). The connections of the 4 portable ID module pins used are reported in a the bitfield. A4 Each recognises ID that pin 1,1,1,1 uses occurs two when bits no each. lead is connected, and sets mode 27, type 5, sync 0.
For If example the portable module recognises that 1,1,1,1 occur when no lead is connected, and sets mode 27, type 5, sync 0.Service_MonitorLeadTranslation is unclaimed RISC OS recognises the following values:
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.
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