On Tue, 6 Jun 2000, Nicolas Welte wrote:
> Done. My 128DCR reads 5.02V between pins 2 and 8 of the video port, and
> my 128D has 4.94V. So all 128s should have 5V there. I also tested a
> C64C (E board, ASSY#250469 for Richard), it also has the 5V there. And
> now, surprise! I just grabbed a C64B (#250425, judging from the diode
> fix at the cassette port and the 1 chip clock circuit, I didn't want to
> open the machine) and it also has the 5V supply there. I didn't know
> this before. So, starting from 1984, all C64 and C128 machines have this
> feature. Strange they never mentioned it in a user's manual.
I opened the 128DCR and tested the connection from the inside. It was 5
V. I also tested my C128, several versions of C64, the C16 and Plus4.
I have changed the pinout list to reflect the results. I don't have a
SX64, so had to rely on the schematics.
By the way, is there a "D" version of the C64? There is the original
version, an A, B, B2, C and E. What happened to "D"?
8 7
Commodore 6 Video Connector
3 1
5 4
2
Plus4 C16/C128
CBM-II VIC20 VIC20CR C64 Pin C64A/SX64 C64B/C/E
--------- ------------ ------- ---------- --- ---------- ----------
(R) Luminance +5 V +5 V Monochrome 1 Monochrome Monochrome (Y)
Ground Ground Ground Ground 2 Ground Ground
(B) V. Sync. Audio Audio Audio 3 Audio Audio (W)
(W) Video 50 Ohm Video Video Video 4 Video Video
(Y) H. Sync. Video Video Audio In 5 Audio In Audio In
6 Chroma Chroma (R)
7
8 +5 V
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