Differences
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mg_notes:iie_card:iie_startup_resources [2018/01/24 18:01] 66.249.66.158 ↷ Links adapted because of a move operation |
mg_notes:iie_card:iie_startup_resources [2018/02/08 13:00] (current) M.G. [Monx] |
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| ===== CNxx ===== | ===== CNxx ===== | ||
| - | These appear to be the slot-mapped firmware. The ones with only 256 bytes have relocatable firmware. The ones that are 1792 (256*7) bytes have 7 copies of the firmware, each specific to the slot they are installed in. These are not obfuscated. | + | These are the slot-mapped firmware. The ones with only 256 bytes have relocatable firmware. The ones that are 1792 (256*7) bytes have 7 copies of the firmware, each specific to the slot they are installed in. These are not obfuscated. |
| <code> | <code> | ||
| Line 38: | Line 38: | ||
| ===== C8xx ===== | ===== C8xx ===== | ||
| - | These appear to be the C8 Firmware for the various cards. They are not obfuscated. | + | These are the C8 Firmware for the various cards. They are not obfuscated. |
| <code> | <code> | ||
| Line 55: | Line 55: | ||
| ===== Monx ===== | ===== Monx ===== | ||
| - | These have simple XOR obfuscation with the key "DoubleX". | + | These have simple XOR obfuscation with the key "DoubleX" (a reference to the card's code name, "Double Exposure"). |
| After de-obfuscating there is a header that tells the IIe application where to put the firmware within the Card's memory. | After de-obfuscating there is a header that tells the IIe application where to put the firmware within the Card's memory. | ||
| Line 148: | Line 148: | ||
| Conclusion: | Conclusion: | ||
| + | |||
| + | **Memory Map of the "ROM" portion of the 256K Card RAM** | ||
| ^ Bank ^ Load Address Range ^ | ^ Bank ^ Load Address Range ^ | ||
| Line 153: | Line 155: | ||
| | D1 | $4000-$7FFF | | | D1 | $4000-$7FFF | | ||
| | D2 | $8000-$BFFF | | | D2 | $8000-$BFFF | | ||
| - | | ? | $C000-$FFFF | | + | | Slot ROM, probably | $C000-$FFFF | |