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 =====A2000 Motherboard Revisions===== =====A2000 Motherboard Revisions=====
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 ^Revision Number^Board Change^ ^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| |4.0|last 4 layer board, has German part number|
 |4.1|video fix, first 2 layer board released to consumers| |4.1|video fix, first 2 layer board released to consumers|
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 |4.3|new Gary (MOS) chip used, pull-up resistors added to support it| |4.3|new Gary (MOS) chip used, pull-up resistors added to support it|
 |4.4|production improvements (previous modifications now included in layout), cost-reduction| |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; Kickstart 1.3 ROM used| +|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| +|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 used|+|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|
 |6.2|fix to get certain expansion boards to work correctly with 256Kx4 DRAMs and Agnus 8372| |6.2|fix to get certain expansion boards to work correctly with 256Kx4 DRAMs and Agnus 8372|
-|6.3| KS2.04 ROM, Agnus 8375 and SuperDenise 8373 as the new default| +|6.3| KS 2.04 ROM, Agnus 8375, and SuperDenise 8373 as the new default|
  
 +Check out [[http://w8.ca/technical/a-2000.shtml]] for some more details.
  
  
  
  
Last modified: le 2023/09/12 19:15

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