Thelen Posted March 10, 2003 Share Posted March 10, 2003 what is used on a atari 7800 for a chip enable signal for an 7800 cartridge rom ? Thelen Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted March 10, 2003 Share Posted March 10, 2003 The CE line is active high, in order to use EPROM's you'd need to invert it. Quote Link to comment Share on other sites More sharing options...
+Mitch Posted March 10, 2003 Share Posted March 10, 2003 The CE line is active high, in order to use EPROM's you'd need to invert it. Actually this is only true for the 16/32k EPROMS. The 64/128K EPROMS don't need an inverter. Mitch Quote Link to comment Share on other sites More sharing options...
Thelen Posted March 10, 2003 Author Share Posted March 10, 2003 so is it A12 on the cartridge port ? or is that only in 2600 mode ? Thanks, Thelen Quote Link to comment Share on other sites More sharing options...
Thelen Posted March 10, 2003 Author Share Posted March 10, 2003 I have found out already : A14 OR a15 high means that CE is active.... Thanks, Thelen Quote Link to comment Share on other sites More sharing options...
DanBoris Posted March 10, 2003 Share Posted March 10, 2003 The 7800 doesn't actually have a chip select line that goes to the cartridge. All the address lines are brought out to the cart and it's up to the cart to decode them and enable the ROM in the appropriate address range. Dan Quote Link to comment Share on other sites More sharing options...
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