Differences

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--- rw:comp:a2000:revisions [2023/09/12 19:22]
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+++ rw:comp:a2000:revisions [2023/09/12 19:25] (current)
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 ^Revision Number^Board Change^
-|3.9|first 2 layer board, dealer demo only|
+|3.9|first 2 layer board, dealer demo only; 256KBx1 memory chips|
 |4.0|last 4 layer board, has German part number|
 |4.1|video fix, first 2 layer board released to consumers|
@@ Line 9: / Line 9: @@
 |4.4|production improvements (previous modifications now included in layout), cost-reduction|
 |4.5|pull-up on U605 (74ALS245) to support certain accelerator cards with the Signetics buffer chip; KS 1.3 ROM  as the new default|
-|5|all brown boards, all from Germany, falls into the 'Holy Grail' territory; if you see one of these buy it at any price; something like (5) of them floating around?|
+|5|all brown boards, all from Germany, falls into the 'Holy Grail' territory; if you see one of these buy it at any price;  supposed to be a 4.5 with the 256KBx4 memory layout of a rev 6 board|
 |6.0|new layout for 1 meg RAM chips; all RAM now CHIP memory|
 |6.1|fix to clean up RAM-retention by adding a reset IC (RAM-retention occasionally caused a guru on power-up though the system would start normally if the left mouse button was pressed); Agnus 8372 (1MB) used|