September 16th, 2021, 10:30
September 16th, 2021, 10:37
September 16th, 2021, 11:45
September 16th, 2021, 13:12
September 16th, 2021, 13:44
September 16th, 2021, 13:52
pepe wrote:what's odd in this case is that for example CPRS is changed to CPRO, 0x53 to 0x4F
This is not one bit error, seems like an intentional change. Also, instable bits usually change from 0 to 1, which contradicts in 53 vs 4F
pepe
Offset(h) 00 02 04 06 08 0A 0C 0E
000002C0 FFFF FFFF FFFF FFFF 1617 041D 050F 1002
000002D0 090C 1506 2E18 FFFF 1613 041D 050F 1002
000002E0 090C 1406 2E18 FFFF 1C1E 0529 0414 1602
000002F0 0B12 1909 3222 FFFF 1B1E 0529 0413 1602
00000300 0B12 1A09 3122 FFFF 1C1E 0529 0414 1602
00000310 0B12 1A09 3222 FFFF 1C1E 052A 0414 1602
00000320 0B12 1B0A 3222 FFFF 1C1E 052A 0414 1602
00000330 0B12 1B09 3222 FFFF 1B1E 052A 0413 1602
00000340 0B12 1B09 3122 FFFF 1C1E 052A 0414 1602
00000350 0B12 1B09 3222 FFFF 1C1E 052B 0414 1602
00000360 0B12 1B09 3123 FFFF 1B1D 062B 0414 1602
00000370 0B12 1C09 3223 FFFF 1B1C 052B 0414 1502
00000380 0A10 1C09 3220 FFFF 1B1C 052B 0414 1502
00000390 0A10 1C09 3221 FFFF 1A1C 052A 0413 1302
000003A0 0A10 1C08 3120 7FFF 1A1C 052A 0413 1502
^
000003B0 0A10 1C08 3020 FFFF 1A1C 052A 0413 1502
000003C0 0A10 1D08 3020 7FFF 1A1C 042A 0413 1402
^
000003D0 0A10 1E08 3120 FFFF 1A1B 0529 0413 1402
000003E0 0A10 1D08 3020 FFFF 191B 0529 0412 1402
000003F0 0A0F 1D07 301F FFFF 1C1E 052A 0414 1602
00000400 0B12 1909 3222 FFFF 1C1E 052A 0414 1602
00000410 0B12 1909 3222 FFFF 1C1E 052A 0414 1602
00000420 0B12 1809 3222 FFFF 1B1E 052A 0413 1602
00000430 0B12 1909 3122 FFFF 1C1E 052A 0414 1602
00000440 0B12 1909 3222 FFFF 1C1E 052B 0414 1602
00000450 0B12 1A09 3222 FFFF 1C1E 052A 0414 1602
00000460 0B12 1A09 3222 FFFF 1C1E 052B 0414 1602
00000470 0B12 1A09 3123 FFFF 1B1D 062B 0414 1602
00000480 0B12 1B09 3223 FFFF 1B1C 052B 0414 1502
00000490 0A10 1B09 3220 FFFF 1A1C 052A 0413 1502
000004A0 0A10 1B08 3120 FFFF 1A1C 052A 0413 1502
000004B0 0A10 1B08 3120 FFFF 1A1B 0529 0413 1402
000004C0 0A10 1B08 311F FFFF 1A1B 0529 0413 1402
000004D0 0A10 1908 311F FFFF 1A1B 0529 0413 1402
000004E0 0A10 1908 301F FFFF 1A1B 0529 0413 1402
000004F0 0A10 1B08 301F FFFF 191A 0528 0412 1302
00000500 0A0F 1C07 301E FFFF FFFF FFFF FFFF FFFF
September 16th, 2021, 17:11
September 16th, 2021, 17:23
pepe wrote:if you mean the 7fffs it might not be an error, the large FFFF areas are not having any bit errors. And would it be bit7 several times?
just my 2 cents.
on the other hand, i haven't seen 7FFF at those locations in any of the 7 rom images i checked.
Let's see what the re-reads give...
pepe
September 16th, 2021, 17:37
September 16th, 2021, 17:46
September 16th, 2021, 23:55
September 17th, 2021, 3:33
September 17th, 2021, 3:58
September 17th, 2021, 4:30
Solder the chip onto a donor board and read it from the pcb via terminal from PC3000.
September 17th, 2021, 4:49
September 17th, 2021, 5:26
September 17th, 2021, 9:25
DeVlL wrote:Hi there.
What is the exact model of that rom chip? Above you put that it is from the flash 25 XX40 series. I ask it because it is still applying a wrong reading voltage. If we can know the exact model of the rom chip, we could look at its datasheet and look at its exact voltage.
September 17th, 2021, 9:28
Lardman wrote:Needless to say if you were getting a good read all 3 would be identical. Whilst the cap if fine in all of them there are errors in the rest. How are you physically connecting to the chip - clip or ziff socket?
Solder the chip onto a donor board and read it from the pcb via terminal from PC3000.
September 17th, 2021, 14:30
Comparing files 00061848_DL_RAPM_bad.bin and 00061848_DL_RAPM_BAD_2.BIN
00000E28: 3F 6A
00000EAA: 3F 41
00001660: 7A 3F
0000276A: 3F 6C
00002B5A: 3F 43
00002E44: 3F 7C
000030B2: 3F 43
00003442: 3F 43
00003694: 7C 3F
000036A2: 43 3F
0000373A: 43 3F
000037D2: 3F 43
0000386A: 43 3F
0000399A: 3F 43
00003A32: 3F 43
00003B62: 43 3F
Comparing files 00061848_DL_RAPM_bad.bin and 00061848_DL_RAPM_BAD_3.BIN
00001660: 7A 3F
00002B5A: 3F 43
00002D22: 43 3F
000033AA: 43 3F
000034F7: 54 3F
00003694: 7C 3F
000036A2: 43 3F
0000372C: 7C 3F
0000386A: 43 3F
00003B62: 43 3F
Comparing files 00061848_DL_RAPM_bad_2.bin and 00061848_DL_RAPM_BAD_3.BIN
00000E28: 6A 3F
00000EAA: 41 3F
0000276A: 6C 3F
00002D22: 43 3F
00002E44: 7C 3F
000030B2: 43 3F
000033AA: 43 3F
00003442: 43 3F
000034F7: 54 3F
0000372C: 7C 3F
0000373A: 3F 43
000037D2: 43 3F
0000399A: 43 3F
00003A32: 43 3F
September 17th, 2021, 14:36
00000E28: 3F 6A
00000E28: 6A 3F
00000EAA: 3F 41
00000EAA: 41 3F
00001660: 7A 3F
00001660: 7A 3F
0000276A: 3F 6C
0000276A: 6C 3F
00002B5A: 3F 43
00002B5A: 3F 43
00002D22: 43 3F
00002D22: 43 3F
00002E44: 3F 7C
00002E44: 7C 3F
000030B2: 3F 43
000030B2: 43 3F
000033AA: 43 3F
000033AA: 43 3F
00003442: 3F 43
00003442: 43 3F
000034F7: 54 3F
000034F7: 54 3F
00003694: 7C 3F
00003694: 7C 3F
000036A2: 43 3F
000036A2: 43 3F
0000372C: 7C 3F
0000372C: 7C 3F
0000373A: 3F 43
0000373A: 43 3F
000037D2: 3F 43
000037D2: 43 3F
0000386A: 43 3F
0000386A: 43 3F
0000399A: 3F 43
0000399A: 43 3F
00003A32: 3F 43
00003A32: 43 3F
00003B62: 43 3F
00003B62: 43 3F
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