Commodore 6567/6569 video chip luminance levels

All units are in mV.

All measurements were made on the same computer (2nd revision board
with 300ns DRAMs) with the same oscilloscope (40MHz analog, using
2µs/div), measured from the luminance output on the video connector
without any other load connected to it.  The measurements were
performed in one session by Marko Mäkelä on 19th of December 1996.

The black level was only measured when the screen was all black.  The
black level at start and end of line changes when the colour changes.

Here's how the luminance signal looks on the oscilloscope:

              .  burst (2 pixels white at the very left of screen)

               ------- colour intensity level (depends on the colour)



---     ------    black level
   -----          hsync

The hsync takes 5 cycles on all chips I measured.  Likewise, the black
period at end of line is 3 cycles long, and it's 6 cycles at beginning
of a new line, right after the hsync.

At the beginning of hsync, there's a negative peak, because the signal
comes down from the black level.  On the two 6567 chips I measured,
the sync signal was so noisy that this peak fitted in the noise interval.

I don't know if burst is the right term for that white strip at the very
left of the screen.  Maybe it's just the end-of-hsync signal.

Chips measured:

MOS / 6569R1 / 0783, KOREA AM047708, ceramic
MOS / 6569R3 / 3483, KOREA AM322148, ceramic
MOS / 6569R4 / 0786, PHILIPPINES / I H065810 / HC-30, plastic
MOS / 6569R5 / 0989 15, HONG KONG / HH102129 / HC-30, plastic
MOS / 6567R5 6A / 4282, 360136, ceramic
MOS / 6567R8 / 2084, HONG KONG / HH172103, plastic

	6569R1	6569R3	6569R4	6569R5	6567R5 6A	6567R8
Sync	75-175	68-144	80-120	80-124  20-160		64-136
-typ.		110	96	100	96		100
-peak		52	60	58	--		--
Burst	1460	1280	1160	1210	1210		1580

Luminances, 6569R1

Colour		Voltage (ripple range)
0		630 (590-680)
2,6,9,11	900 (860-960)
4,5,8,10,12,14	1260 (1200-1320)
3,7,13,15	1560 (1500-1620)
1		1850 (indistinguishable)

Luminances, 6569R3
Colour		Voltage (ripple range)
0		700 (680-720)
6,9		1020 (990-1030)
2,11		1090 (1070-1110)
4,8		1180 (1160-1200)
12,14		1300 (1280-1320)
5,10		1340 (1320-1360)
3,15		1480 (1460-1500)
7,13		1620 (1600-1640)
1		1850 (indistinguishable)

Luminances, 6569R4
Colour		Voltage (ripple range)
0		500 (480-520)
6,9		760 (740-780)
2,11		840 (820-860)
4,8		920 (900-940)
12,14		1050 (1030-1070)
5,10		1100 (1080-1120)
3,15		1300 (1280-1320)
7,13		1500 (1480-1520)
1		1875 (indistinguishable)

Luminances, 6569R5
Colour		Voltage (ripple range)
0		540 (520-560)
6,9		810 (790-830)
2,11		900 (880-920)
4,8		980 (960-1000)
12,14		1110 (1090-1130)
5,10		1150 (1130-1170)
3,15		1340 (1320-1360)
7,13		1520 (1500-1540)
1		1850 (indistinguishable)

Luminances, 6567R5 6A
Colour		Voltage (ripple range)
0		560 (495-640)
2,6,9,11	840 (780-920)
4,5,8,10,12,14	1180 (1100-1240)
3,7,13,15	1500 (1440-1600)
1		1825 (1775-1900)

Luminances, 6567R8
Colour		Voltage (ripple range)
0		590 (570-630)
6,9		860 (840-880)
2,11		950 (920-980)
4,8		1030 (1010-1050)
12,14		1160 (1140-1200)
5,10		1210 (1190-1230)
3,15		1380 (1360-1400)
7,13		1560 (1540-1580)
1		1825 (indistinguishable)