Pong arcade schematic

[27ace27]

I am using this schematic of the PONG arcade system, http://www.atarihq.com/danb/files/PongSchematic.pdf , but have some questions. do the resistors like the one on the HSYNC board hooking up to +5V have any specific value? there isn't one on any schematic I can find.

[atarifan49]

I am using this schematic of the PONG arcade system, http://www.atarihq.com/danb/files/PongSchematic.pdf , but have some questions. do the resistors like the one on the HSYNC board hooking up to +5V have any specific value? there isn't one on any schematic I can find.

 

Those resistors are pull-up resistors. They are holding the particular inputs at a logic high level. Pull-up resistors usually range in value from 1k ohm to upwards of 10k ohms. You can safely use 2.2k or 2200 ohm (red-red-red-gold - 4band, red-red-black-brown-gold - 5band).

 

Glenn

[27ace27]

I am using this schematic of the PONG arcade system, http://www.atarihq.com/danb/files/PongSchematic.pdf , but have some questions. do the resistors like the one on the HSYNC board hooking up to +5V have any specific value? there isn't one on any schematic I can find.

 

Those resistors are pull-up resistors. They are holding the particular inputs at a logic high level. Pull-up resistors usually range in value from 1k ohm to upwards of 10k ohms. You can safely use 2.2k or 2200 ohm (red-red-red-gold - 4band, red-red-black-brown-gold - 5band).

 

Glenn

 

Thank you very much! that is exactly what I needed.