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Infos about Puxing PX888K .img file from Chirp for manual "tweaking" :
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Memories partial infos :
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------------------------
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Stored on 16 bytes (00 to FF).
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The bytes 00 to 03 contains the RX frequency.
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The bytes 04 to 07 contains the TX frequency
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The bytes 08 to 09 contains the CTSS/DCS code for RX
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The bytes 0A to AB contains the CTSS/DCS code for TX
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For CTSS or DCS code, if the first digit is 8, its DCS, else it's CTSS.
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The bytes 0C and OD contains C8 00 (don't know (yet) why but they have to).
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So the last memory is at offset 0x7F0 (2032d (16 x (128 - 1)) (128 - 1 because
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first memory i s at offset 0)). And the 13 will be a 0xC0 (16 x (13 - 1)) = 192d.
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Example : F RX F TX C R C T Exist ?
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Offset 0xC0 (mem 13) 44 60 81 25 44 60 43 75 82 43 11 88 C8 00 FF FF
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F RX F TX C R (DCS) C T (CTCSS)
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446.08125 446.04375 243 118.8
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If T RX is different from F RX, it is seen as offset in Chirp.
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Memories names infos :
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----------------------
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Stored on 6 bytes (00 to FF).
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The first is at the offset 0x800
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The second is at the offset 0x808
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The nexts are at the offsets 0x810 / 0x818, 0x820 / 0x828 and so on with a multiple
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of 16 up to the last. The 2 last are at offset 0xBF0 / 0xBF8.
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800h = 2048d 2048 16 x ((128/2 - 1) = 1008 2048 + 1008 = 3056 3056d = BF0h
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Example : C H - 1 3 C H - 1 4
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Offset 0x900 (mem 13/14) 50 4D 52 2D 31 33 FF FF 50 4D 52 2D 31 34 FF FF
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Memory used/defined partial infos :
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-----------------------------------
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Important : If not set correcly, the memories are not seen in Chirp
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Stored twice at offsets 0xC20 and 0xC30. Why twice i don't know.
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They are calculated with the "powers of 2" (1, 2, 4, 8, 16, 32, 64, 128...) and they
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are the sum of "2 powers of 0 to 7" for 8 memories for each byte up to 128 memories
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(8 x 16 = 128). I wanted 32 mems, from 1 to 16 and from 21 to 36. Here are my details :
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1 (mem 1++) 1 (mem 9) 1 (mem 17) 1 (mem 25) 1 (mem 33)
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2 | 2 | 2 2 | 2 |
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4 | 4 | 4 4 | 4 |
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8 | 8 | 8 8 | 8 (mem 36--)
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16 | 16 | 16 (mem 21++) 16 | 16
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32 | 32 | 32 | 32 | 32
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64 | 64 | 64 | 64 | 64
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128 (mem 8) 128 (mem 16--) 128 (mem 24) 128 (mem 32) 128 (mem 40)
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1+2+...+64+128 1+2+...+64+128 16+32+64+128 1+2+...+64+128 1+2+4+8
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255 / FF 255 / FF 240 / F0 255 / FF 15 / 0F
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So for me, the datas to write at offsets 0xC20 and 0xC30 are : FF FF F0 FF 0F
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I hope it's clear and i hope this can help ! ;-)
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Ti'R.
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