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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 | + | |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| | + | |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| KS 2.04 ROM, Agnus 8375, and SuperDenise 8373 as the new default| | ||
| + | Check out [[http:// | ||
Last modified: le 2023/09/12 19:05