How to change horizontal geometry

[outrunner]

Hi,

I've been successfully using groovymame with a SCART TV for a few months  but would love to work out how to alter the H geometry so that the image isn't so over scanned on my TV.

I've read through some very complex post on this forum but can't work out exactly what I need to change in mame.ini

So far I've opened arcade osd for 384 x 240 at 60hz and by changing H front porch from 2 (2.033) to 3 (3.002) the image is placed perfectly. I assume the next step is to reflect this in a monitor spec_line?

At the moment my mame.ini has CRT_range0 to 9 all set to Auto, should I replace one of the Autos with a spec line and how do I know what spec to use?

Thanks in advance.

[Calamity]

What monitor preset are you currently using in mame.ini?

[outrunner]

Hi Calamity, I was hoping you'd reply 

The mame.ini has what I assume is the default preset of generic_15

[Calamity]

Hi outrunner,

Try the following, in mame.ini

monitor custom
crt_range0 15625-15750, 49.50-65.00, 3.002, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 192, 288, 448, 576

[outrunner]

Yep that did the trick

Thanks for the support Calamity - think it's about time I made a donation. If it's not too much bother please can you post the link to donate, can't remember where to find it?

[Calamity]

Hi outrunner,

I'm glad that it worked. There are donation links in https://code.google.com/p/groovyarcade/