AOX DoubleTime 16 - Info needed
- Thread starter asapreta
- Start date
Sorry, I thought yesterday I answered your post with the picture I took while cleaning it up. But here it is.
The only info I have are these:
DoubleTime-16™ Accelerator Features: • easy installation • math coprocessor support
• 16 MHz 68000 chip
• twice the speed of an SE
• 100 % compatible
• port for large screen monitor
So the pinout would be nice to know how to attach a external large screen monitor.
The only info I have are these:
DoubleTime-16™ Accelerator Features: • easy installation • math coprocessor support
• 16 MHz 68000 chip
• twice the speed of an SE
• 100 % compatible
• port for large screen monitor
So the pinout would be nice to know how to attach a external large screen monitor.
The photo isn't hi-res enough to read the labels on some of the chips, but those might be VRAM chips to the right of the 68000. However I'm not sure whether the rest of the circuitry to drive an external display exists on this board. In particular there's no sign of another crystal or oscillator, which means it's an open question whether there's any pixel clock source.
It's possible that either H201 or H202 is designed to connect to some expansion board that provides the rest of the video circuitry. If you have a scope you might probe some of those pins to see if you can find any evidence of a sync and video signal. It will certainly be TTL level so would need level shifting for a modern display at minimum.
It's possible that either H201 or H202 is designed to connect to some expansion board that provides the rest of the video circuitry. If you have a scope you might probe some of those pins to see if you can find any evidence of a sync and video signal. It will certainly be TTL level so would need level shifting for a modern display at minimum.
It's possible that the 12 pin H202 header could be for video - I've seen it before - but it seems like the card alone isn't capable of it. MacWorld didn't make any mention of it in their review, and neither did InfoWorld in their brief mentions of it.
Users on an old forum mentioned a video connection, but that was as far as it went.
Additionally they mentioned a software version (v2.32), as well as issues using the card with System 7 (possibly not related to the software version I mentioned prior).
Users on an old forum mentioned a video connection, but that was as far as it went.
Additionally they mentioned a software version (v2.32), as well as issues using the card with System 7 (possibly not related to the software version I mentioned prior).
Aox DoubleTime-16
are extremely rare, as the card often required an additional proprietary expansion board or specific cabling to utilize its video output.
However, community research on similar vintage Macintosh SE accelerators (like those from Mobius, which shared designs with Aox) suggests that these external monitor ports typically carried monochrome TTL-level signals.
Estimated Video Pinout
If your card uses a standard 15-pin (DB-15) Macintosh-style video connector, the signals typically follow the Apple monochrome standard:
Technical Considerations
are extremely rare, as the card often required an additional proprietary expansion board or specific cabling to utilize its video output.
However, community research on similar vintage Macintosh SE accelerators (like those from Mobius, which shared designs with Aox) suggests that these external monitor ports typically carried monochrome TTL-level signals.
Estimated Video Pinout
If your card uses a standard 15-pin (DB-15) Macintosh-style video connector, the signals typically follow the Apple monochrome standard:
| Pin | Signal | Description |
|---|---|---|
| 1 | Ground (Shield) | Chassis ground |
| 2 | RED | (Unused or tied to monochrome signal) |
| 3 | C-SYNC / H-SYNC | Combined or Horizontal Sync |
| 4 | MON-ID 1 | Monitor ID bit 0 |
| 5 | GREEN | Main monochrome video signal |
| 7 | MON-ID 2 | Monitor ID bit 1 |
| 9 | BLUE | (Unused or tied to monochrome signal) |
| 11 | Ground | Logic ground |
| 12 | V-SYNC | Vertical Sync signal |
| 15 | C-SYNC | Alternate Composite Sync location |
Technical Considerations
- Signal Type: The output is almost certainly TTL level, meaning it cannot be connected directly to a modern VGA or HDMI monitor without a level shifter or a specialized converter like the RGBtoHDMI.
- Internal Headers: If you are looking at headers on the board itself (often labeled H201 or H202), these are usually raw taps for Sync and Video signals intended for an optional daughterboard.
- Software: Most of these cards require a specific control panel or extension (like the Mobius Display driver) to activate the external video port.
