1861 Replacement


cmdrcosmac
 

Hi all,

 I'm planning to build Chuck Yakym's 1861 replacement circuit and would like
to hear the Group's experience and advice.
 
 Would using 74HC rather than LS logic work?

 I would like to use a 28C256 EEPROM for the timing ROM as I can program these
on the Elf. There was apparently  some issue with different types of EPROMS in
this circuit. Has this been explained or resolved?

 Has anyone tried to re-do the timing to generate VGA timing rather than NTSC?

Thanks for your help.
-Chuck

 

Join cosmacelf@groups.io to automatically receive all group messages.