Dropcheck Posted March 17 Author Share Posted March 17 (edited) 1 hour ago, kheller2 said: Bumping an old thread. Was there a final consensus on this ? I'm asking for two reasons: 1) The new 1090 boards that are being made (would it be a benefit to it to have these lines) 2) The 800XL prototypes and working samples DID have +5 on pin 47/48 as do all 600XLs. Edited March 17 by Dropcheck previous post answered better Quote Link to comment Share on other sites More sharing options...
foft Posted March 18 Share Posted March 18 So where does it get RD4 and RD5 from on the XL? Quote Link to comment Share on other sites More sharing options...
Rybags Posted March 18 Share Posted March 18 It would have to be patched in from the incoming line from the normal cart port I'd think. The cartridge decides whether this signal is active or not (usually hardwired) - the computer only uses that signal as part of memory select logic. Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted March 18 Share Posted March 18 5 hours ago, foft said: So where does it get RD4 and RD5 from on the XL? RD4 and RD5 are not needed for the XL. They are needed with the XE. With the XE, RD4, RD5, PORTB bit 0, PORTB bit 1, and PORTB bit 7, and some address lines (A15 through A11) are all needed so a PLD can determine if the EXTENB line is low or high and re-create it. Quote Link to comment Share on other sites More sharing options...
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