30 Nov
2007
30 Nov
'07
4:27 p.m.
On Wed, 28 Nov 2007, Jim Leonard wrote:
..."There ain't such thing as NTSC or PAL timings"... only video timings
and optionally a color carrier of some kind.
Correct. There are certainly 525-line PAL standards. And it wouldn't
suprise me if there wasn't a 625-line colour system using NTSC-lke encoding.
And PAL does not imply a 4.43MHz colur subcarrier either. There are PAL
standards with 35...MHz carriers.
Does
anybody know which ones and could they do PAL or just NTSC?
All models except the A4000 (and maybe the A3000, but I'm not sure) were made
in NTSC or PAL specific versions, with a different color generator and
crystal to match. The A4000 had a jumper on the motherboard that selected
either NTSC or PAL timings. The only model that could output a NTSC or PAL signal
was the Amiga 1000.
Early European models did NTSC, newer ones (like mine) did PAL. With the
appearance of the 500/2000 in spring 1987 Commodore removed the color
generator from the machines so they only output a monochrome BAS (VBS)
instead of an FBAS (CVBS) signal. No color, no NTSC nor PAL, i.e. signals
without color carrier are neither NTSC nor PAL.
Unfortunately, people tend to use 'NTSC' to mean 'RS170 video timings'
(which might be reasonable, did RS-170 come from the National Television
Standards Committee?) and 'PAL' to mean System B/G/I timings. No I don't
like it either (I tend to say 'US' or 'European' video, which while not
precise is at least not technically wrong).
-tony