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| | Secret Weapons of Commodore: The 6509s: The P500, B128/256, B500, 600, 700, BX128/256 |
 | | The B128/600 series are the direct inheritors of the B500, and seem to be identical in all respects except name and memory configuration. |
 | | Unlike the 6510, however, both locations were active (on the 6510, you write to $1, and read from $0, so it's more like just one location in two places); $0 sets the execution bank, and $1 sets the indirection bank (see below). |
 | | Since Commodore owned MOS Technology, they could, and did, make many sorts of weirdly tweaked 6502s. |
| www.floodgap.com /retrobits/ckb/secret/b128.html (2657 words) |
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