I ran "-dC000:0 FFFF" to get some overview here:
C000-C7FF looks to be my 32k Video bios (starts with 55 AA 40, shows string "VGA Coompatible BIOS")
C800-C81F indeed has something to do with the extra UDMA (starts with 55 AA 01, shows string "HIGHPOINT", no FF's)
C820-CFFF is empty (all FF)
So could it be that the HIGHPOINT UDMA jumps to somewhere else for its payload ?
I suppose that the tuny ROM module at C8000 is just HighPoint initialisation and its real BIOS is elsewhere. Enclosed is the entire contents of this ROM that Erwin sent me. The rest are FFs.
Lucho
C000:8000 55 AA 01 E9 6E 1C 48 69 | 67 68 50 6F 69 6E 74 20 U...n.HighPoint
C000:8010 49 44 45 20 33 36 36 20 | 80 04 F4 17 00 00 74 18 IDE 366 ......t.
C000:8020 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8030 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8040 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8050 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8060 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8070 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8080 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:8090 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:80A0 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 ................
C000:80B0 00 00 00 00 00 00 00 00 | 80 FC C2 0F 84 19 00 60 ...............`
C000:80C0 1E 8B EC 8E 5E 14 BE 74 | 18 38 14 74 20 83 C6 44 ....^..t.8.t ..D
C000:80D0 3B 36 21 08 72 F3 1F 61 | 83 C4 04 EA 00 00 00 00 ;6!.r..a........
C000:80E0 1F 61 CB 80 C1 04 EB 2A | B9 03 00 EB 25 80 FC 0C .a.....*....%...
C000:80F0 74 F6 80 FC 47 74 F1 8A | CC 83 E1 3F 80 E9 02 72 t...Gt.....?...r
C000:8100 DF 80 F9 02 77 DA F6 44 | 02 06 74 D7 F7 C3 01 00 ....w..D..t.....
C000:8110 75 D1 06 8B F9 D1 E7 FF | B5 03 08 8A 4C 38 51 8B u...........L8Q.
C000:8120 EC 80 66 20 FE 81 4E 20 | 00 02 F6 C4 40 75 26 8A ..f ..N [EMAIL
PROTECTED]&.
C000:8130 44 2C F6 E6 8B 7E 14 8B | CF 83 E7 3F 03 F8 4F 8B D,...~.....?..O.
C000:8140 C1 86 C4 C0 EC 06 F7 64 | 06 03 F8 83 D2 00 8A 66 .......d.......f
C000:8150 16 8C C1 EB 1A 8E 46 06 | 8B 7E 0A 26 8A 65 02 26 ......F..~.&.e.&
C000:8160 8B 5D 04 26 8B 4D 06 26 | 8B 55 0A 26 8B 7D 08 0E .].&.M.&.U.&.}..
C000:8170 1F 80 7E 02 70 0F 85 02 | 00 B4 01 88 26 06 00 66 ..~.p.......&..f
C000:8180 25 00 FF 00 00 66 D1 E0 | 89 3E 0C 00 89 16 0E 00 %....f...>......
C000:8190 89 1E 00 04 89 0E 02 04 | A3 04 04 C7 06 06 04 00 ................
C000:81A0 80 80 7E 03 00 0F 84 8F | 00 BA 40 00 8E C2 26 F6 [EMAIL PROTECTED]&.
C000:81B0 06 7B 00 20 75 2D A3 3C | 00 8B C1 C1 E9 0C C1 E0 .{. u-.<........
C000:81C0 04 03 C3 83 D1 00 A3 38 | 00 89 0E 3A 00 C7 06 3E .......8...:...>
C000:81D0 00 00 80 EB 5B 8A 46 17 | C0 E0 04 32 E4 89 46 02 ....[.F....2..F.
C000:81E0 EB 56 90 89 0E 30 00 66 | A3 28 00 89 1E 2C 00 C7 .V...0.f.(...,..
C000:81F0 06 2E 00 00 00 C7 06 34 | 00 10 00 C7 06 32 00 00 .......4.....2..
