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Forum Index : Microcontroller and PC projects : this still correct picomite vga out  from the manual

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tenij000
Newbie

Joined: 30/05/2025
Location: Netherlands
Posts: 27
Posted: 01:02pm 31 May 2025
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if use a 7 pin header then i can connect it like shield right if use this from the manual dont use the red x pins 4,9,11,12,15

21 | 270Ω |1
20 | 390Ω |2
19 | 820Ω conect to 2 between the 390Ω resistor and the 2 pin
18 | 270Ω |3
gnd|      connect to pins 5,6,7,8,10
17 |      connect to pin 14
16 |      connect to pin 13      



https://ibb.co/5Wv3h5QZ
Edited 2025-05-31 23:09 by tenij000
 
phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 2601
Posted: 01:17pm 31 May 2025
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Yes that looks right.
 
Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 7844
Posted: 01:24pm 31 May 2025
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Proper VGA cable has individual screened cores for the colour signals, so as a minimum you have three GND conductors. What you can get away with depends on the connections at both ends and the cable length.

If at all possible I would try to fit a standard VGA connector. It leaves your options open for any leads then.

I can assure you though that a RJ45 8-pin connector works well for VGA. In fact, you can get VGA-RJ45 adapters ready made. There is a sort of standard connection:

RJ45           VGA
1  -  OR/WH  - Red gnd
2  -  OR     - Red
3  -  GN/WH  - Blue gnd
4  -  BU     - Green
5  -  BU/WH  - Green gnd
6  -  GN     - Blue
7  -  BN/WH  - HSYNC
8  -  BN     - VSYNC

VGA over CAT5 works remarkably well and I've run it over 5m or so.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
dddns
Guru

Joined: 20/09/2024
Location: Germany
Posts: 485
Posted: 02:31pm 31 May 2025
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If you connect it like this it is the default and it will give you immediately a picture . With OPTION VGA PINS you can have a individual setup.
If you use the default it will not be shown with OPTION LIST
 
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