Electronics > Repair
What more i can do?
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squadchannel:
can mount it with imdisk. :box:

squadchannel:
two EPROMs are just system drives; the CGROM is a character ROM.
so assuming there are no other ROMs, I would consider TORNADO a chipset designed to run only the boot sector of the EPROMs.

yep, no BIOS or anything.

found BIOS in $70000...?

 ;D
fzabkar:
KDX.SYS is the 64KiB BIOS (0x70000 - 0x7FFFF). Its 8-bit checksum is 0x00.


--- Code: ---end of EPROM = end of KDX.SYS, so KDX.SYS is the BIOS.

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

0007FE70  FC 2E AD AB 0C 80 AB E2 F8 C3 16 42 49 4F 53 20  ü..«.€«âøÃ.BIOS
0007FE80  CA DE B0 BC DE AE DD 20 4B 44 58 2E 31 2E 33 34  ÊÞ°¼Þ®Ý KDX.1.34  <-- WACOM KDX.1.34 BIOS
0007FE90  41 1C 43 6F 70 79 72 69 67 68 74 20 31 39 39 33  A.Copyright 1993
0007FEA0  2C A5 A5 2C 39 37 20 57 41 43 4F 4D 20 20 17 2B  ,¥¥,97 WACOM  .+
0007FEB0  20 4D 45 4D 4F 52 59 20 28 30 30 30 30 30 2D 31   MEMORY (00000-1
0007FEC0  46 46 46 46 29 20 0E 2B 20 56 52 41 4D 20 4D 45  FFFF) .+ VRAM ME
0007FED0  4D 4F 52 59 20 1A 2B 20 45 58 54 45 4E 44 45 44  MORY .+ EXTENDED
0007FEE0  20 4D 45 4D 4F 52 59 20 30 30 30 30 30 4B 42 20   MEMORY 00000KB
0007FEF0  10 2B 20 49 4E 49 54 49 41 4C 49 5A 45 20 4F 4B  .+ INITIALIZE OK
0007FF00  21 79 04 0F 00 05 37 05 39 05 46 05 60 05 47 05  !y....7.9.F.`.G.
0007FF10  23 05 39 05 2F 04 2C 04 22 04 6A 04 5E 04 3B 04  #.9./.,.".j.^.;.
0007FF20  73 01 23 79 04 10 00 05 61 05 62 05 6A 05 39 05  s.#y....a.b.j.9.
0007FF30  24 05 43 05 41 04 4E 26 62 2D 46 04 2C 29 54 20  $.C.A.N&b-F.,)T
0007FF40  35 04 47 04 39 01 23 20 5B 42 38 45 4E 44 5D 00  5.G.9.# [B8END].
0007FF50  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FF60  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FF70  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FF80  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FF90  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FFA0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FFB0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FFC0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FFD0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FFE0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0007FFF0  E9 0D F8 00 00 00 00 00 00 00 00 00 00 00 DC C8  é.ø...........ÜÈ  <-- Intel 80486 boots from here
--- End code ---

The file system has an unusual sector size of 1024 bytes with 1 sector per cluster.

FAT boot sector


--- Code: --- LBA:0                  block: 0

 OEM identifier   "(.9SFIHC       "
 Bytes per Sector  1024
 Sectors per Clust 1
 Reserved Sectors  1
 Number of FATs    2
 Root Dir Entries  192
 Total Sectors     512
 Media Descriptor  hE
 Sectors per FAT   2
 Sectors per Track 8
 Number of Heads   2
 Hidden Sectors    0
 Total Sectors     0
 (0x00800080)      00000000h
 Tot. NTFS Sectors 562997198454784
 MFT Cluster       10376293541461622784
 MFT Mirr Cluster  2314937383425933312
 Clusters per FILE 538976288           (0 bytes)
 Clusters per INDX 1297307987          (0 bytes)
 Serial Num (hex)  534F4453-53202020h
 Checksum          6F4E5359h
 Boot Sign (0xAA55)0000h
--- End code ---

Root directory


--- Code: --- LBA:10                 block: 10

    name  ext       size   cluster attrs    modified            created                accessed
-------------------------------------------------------------------------------------------------
 IO       SYS      32576         2 RHS--A-- 1997-04-07 01:31:00 0000-00-00 00:00:00.00 0000-00-00
 MSDOS    SYS      29248        34 RHS--A-- 1988-03-14 03:21:00 0000-00-00 00:00:00.00 0000-00-00
 COMMAND  COM      24931        63 -----A-- 1991-09-11 02:00:00 0000-00-00 00:00:00.00 0000-00-00
 KDX      SYS      65536       439 RHS--A-- 1997-04-07 01:34:00 0000-00-00 00:00:00.00 0000-00-00
 KDX4SysR OM           0         0 ---V---- 1997-04-07 01:34:00 0000-00-00 00:00:00.00 0000-00-00
 AUTOEXEC BAT        189        88 -----A-- 1997-04-07 01:34:00 1996-11-20 12:15:44.47 1996-11-20
 CONFIG   SYS         80        89 -----A-- 1997-04-07 01:34:00 0000-00-00 00:00:00.00 1996-11-20
 CHKTP    COM         58        90 -----A-- 1995-12-19 01:00:00 0000-00-00 00:00:00.00 0000-00-00
 CHMSW    EXE       9536        91 -----A-- 1995-12-11 01:45:00 0000-00-00 00:00:00.00 0000-00-00
 DATETIME EXE      12282       101 -----A-- 1992-12-08 01:20:00 0000-00-00 00:00:00.00 0000-00-00
 FDFMT    EXE      14125       113 -----A-- 1994-10-24 01:02:50 0000-00-00 00:00:00.00 0000-00-00
 FMCOPYA  EXE      36102       127 -----A-- 1996-08-08 04:30:00 0000-00-00 00:00:00.00 0000-00-00
 FORMAT   EXE      16318       162 -----A-- 1993-09-07 02:10:50 0000-00-00 00:00:00.00 0000-00-00
 HFORMAT  EXE      25506       178 -----A-- 1994-06-21 02:15:50 0000-00-00 00:00:00.00 0000-00-00
 KBEMU2   EXE      16371       203 -----A-- 1995-12-08 03:00:00 0000-00-00 00:00:00.00 0000-00-00
 KMENU    EXE      40952       219 -----A-- 1993-02-17 01:59:58 0000-00-00 00:00:00.00 0000-00-00

 LBA:11                 block: 11

 KMENU    KMN       1119       259 -----A-- 1995-12-14 01:00:00 0000-00-00 00:00:00.00 0000-00-00
 KXCOPY   EXE      20230       261 -----A-- 1995-04-03 01:30:24 0000-00-00 00:00:00.00 0000-00-00
 PCFMT    EXE      14299       281 -----A-- 1995-12-22 01:00:00 0000-00-00 00:00:00.00 0000-00-00
 PCFORMAT BAT        377       295 -----A-- 1995-12-21 01:00:00 0000-00-00 00:00:00.00 0000-00-00
 RSLINK   EXE      24774       296 -----A-- 1996-08-08 02:31:00 0000-00-00 00:00:00.00 0000-00-00
 SIO2DRV  COM       3451       321 -----A-- 1995-08-31 02:00:00 0000-00-00 00:00:00.00 0000-00-00
 SPEED    EXE       7976       325 -----A-- 1993-02-23 01:40:00 0000-00-00 00:00:00.00 0000-00-00
 SYMDEB   EXE      26533       333 -----A-- 1985-10-16 04:00:00 0000-00-00 00:00:00.00 0000-00-00
 TPCAL    EXE      37510       359 -----A-- 1995-12-13 01:11:00 0000-00-00 00:00:00.00 0000-00-00
 TPMOUSE  EXE      10901       396 -----A-- 1995-12-01 03:00:00 0000-00-00 00:00:00.00 0000-00-00
 TPSYS    EXE      10300       407 -----A-- 1995-12-18 02:01:00 0000-00-00 00:00:00.00 0000-00-00
 ASING    EXE       5040       418 RH---A-- 1993-03-08 01:01:00 0000-00-00 00:00:00.00 0000-00-00
 ÕSING    EXE       5040       401 -------- 1993-03-08 01:01:00 0000-00-00 00:00:00.00 0000-00-00
 ÕP       300>         0         0 ----D--- 1995-07-31 19:10:18 0000-00-00 00:00:00.00 0000-00-00
                       0         0 -------- 0000-00-00 00:00:00 0000-00-00 00:00:00.00 0000-00-00
                       0         0 -------- 0000-00-00 00:00:00 0000-00-00 00:00:00.00 0000-00-00
--- End code ---
fzabkar:
Arrggh! A Moonie!


--- Code: ---Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00002820  05 74 05 7C 05 00 0D 0A 33 6D 6F 64 65 20 46 44  .t.|....3mode FD
00002830  2D 42 49 4F 53 20 4B 44 58 34 2E 31 2E 33 34 20  -BIOS KDX4.1.34
00002840  66 6F 72 20 46 44 43 33 37 43 36 36 31 20 28 D3  for FDC37C661 (Ó
00002850  B0 C0 4F 46 46 29 20 62 79 20 57 41 43 4F 4D 20  °ÀOFF) by WACOM
00002860  31 39 39 37 2E 30 34 20 20 52 65 76 2E 53 75 6E  1997.04  Rev.Sun
00002870  26 4D 6F 6F 6E 0D 0A 00 00 00 00 00 00 00 00 00  &Moon...........
--- End code ---

The FDC37C661 device is a 2.88MB Super I/O Floppy Disk Controller with a parallel port, 2 x serial ports and an IDE interface.

https://theretroweb.com/chip/documentation/fdc37c661-6419cedba3e3f070037826.pdf (datasheet)
222Lab_Test222:
Did it (EPROMS DATAs) says or shows anything regarding where the issues are?  :scared:
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