Integrator Timing

kokovec
Cinematronic

Posts: 556

Integrator Timing Feb 28, 2014 14:25:02 GMT -5

Quote

Post by kokovec on Feb 28, 2014 14:25:02 GMT -5

Just throwing this out there...
I've been looking a little deeper into the Vectrex CRT drive circuitry and was wondering if anyone has figured out the integrator RAMP timing.
It seems that the Vectrex BIOS functions use a VIA timer to cycle the integrators and I was wondering if anyone has done the math to figure out the RAMP on/off timing.

jfmateos Space War(ped) Getting in love with Mine Storm Posts: 208	Integrator Timing Feb 28, 2014 14:51:00 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jfmateos on Feb 28, 2014 14:51:00 GMT -5 Probably Pavel: vectex.itherm.cz/ You may ask him

kokovec Cinematronic Posts: 556	Integrator Timing Mar 1, 2014 2:03:46 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by kokovec on Mar 1, 2014 2:03:46 GMT -5 I decided to break out my logic analyzer and I'm getting RAMP at ~28Us.

jfmateos Space War(ped) Getting in love with Mine Storm Posts: 208	Integrator Timing Mar 1, 2014 3:03:57 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jfmateos on Mar 1, 2014 3:03:57 GMT -5 Nice kokovec... may I ask why are you interested in that value? Just curiousity.

jfmateos Space War(ped) Getting in love with Mine Storm Posts: 208	Integrator Timing Mar 1, 2014 3:41:46 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jfmateos on Mar 1, 2014 3:41:46 GMT -5 I am dreaming with a color vectrex... and you?

kokovec Cinematronic Posts: 556	Integrator Timing Mar 1, 2014 4:39:18 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by kokovec on Mar 1, 2014 4:39:18 GMT -5 Sorry, it was actually 16 Us. Had my probe on the wrong pin. I'm working on something and am trying to get the timing for all the control lines. I'll talk about it some more if I actually get it to work.

Post by kokovec on Feb 28, 2014 14:25:02 GMT -5

Post by jfmateos on Feb 28, 2014 14:51:00 GMT -5

Post by kokovec on Mar 1, 2014 2:03:46 GMT -5

Post by jfmateos on Mar 1, 2014 3:03:57 GMT -5

Post by jfmateos on Mar 1, 2014 3:41:46 GMT -5

Post by kokovec on Mar 1, 2014 4:39:18 GMT -5