Mac IIsi - SoG?

[Al Kossow]

On 10/27/15 7:10 PM, Jules Richardson wrote:
> On 10/27/2015 08:36 PM, Al Kossow wrote:
>>
>>
>> On 10/26/15 8:30 PM, Jules Richardson wrote:
>>
>>> I've got a system here which makes encouraging startup noises, but isn't
>>> outputting any video to a VGA screen (adapter cable OK with my other Macs).
>>>
>>
>> The si and cx/ci are old enough that it doesn't support VGA timing.
>
> Hmm, so strapping pin 7 to pin 10 on the video connector isn't enough to kick it into 640x480 mode like it is with various other Apple hardware?
>
> For the 512x384 mode it's certainly not within VGA spec, but I know the system is capable of 640x480, which I'm assuming should be. I'm currently wondering if it's outputting composite sync, though -
> everything I'd seen suggested it was either SoG or separate h/vsync, but maybe that's wrong and it's neither.
>
> cheers
>
> J.
>
>
>

here is a mirror of the tech note that describes the pinouts and sense codes

https://web.archive.org/web/20040222182709/http://developer.apple.com/technotes/hw/hw_30.html

The RBV ASIC in the SI only knows about the original 8 sense codes.