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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> | ||
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===== 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> | ||
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===== 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. | ||
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Conclusion: | Conclusion: | ||
+ | |||
+ | **Memory Map of the "ROM" portion of the 256K Card RAM** | ||
^ Bank ^ Load Address Range ^ | ^ Bank ^ Load Address Range ^ | ||
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| D1 | $4000-$7FFF | | | D1 | $4000-$7FFF | | ||
| D2 | $8000-$BFFF | | | D2 | $8000-$BFFF | | ||
- | | ? | $C000-$FFFF | | + | | Slot ROM, probably | $C000-$FFFF | |