[Coco] Accessing Vsync & Hsync interrups from Nitros9

[L. Curtis Boyle]

Yes, it’s a special driver that Bruce Isted wrote decades ago, that replace AGIDR, FTDD, NIL, etc. with one driver. It handles /nil, handles allocating memory outside of a process’ workspace, handles VIRQ signalling based on timing, etc. Should be part of the standard Nitros9 distribution.

L. Curtis Boyle
curtisboyle at sasktel.net



> On Apr 11, 2020, at 1:33 AM, Walter Zambotti <zambotti at iinet.net.au> wrote:
> 
> VRN ?
> 
> On 2020-04-11 15:31, L. Curtis Boyle wrote:
>> You can try using the functionality in VRN (and /nil), as it used VIRQ timers based on VSync. The Sierra games and Flight Sim II use it. I don’t think anything uses HSync currently - it would be a lot of overhead for multi-tasking.
>> 
>> L. Curtis Boyle
>> curtisboyle at sasktel.net
>> 
>> 
>> 
>>> On Apr 11, 2020, at 1:13 AM, Walter Zambotti <zambotti at iinet.net.au> wrote:
>>> 
>>> So I am in need of Vsync synchronization in my application.
>>> 
>>> Is it possible to register for this interrupt in Nitros09 in a user land
>>> application?
>>> 
>>> Either asm or C.
>>> 
>>> Walter
>>> 
>>> 
>>> 
>>> -- 
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>>> 
>> 
> 
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