There's some additional info on the Basis 108 on the German VzEkC forum, user j.s.com is working on a Basis 108 emulator

Quote
The Basis has slots 2-7 for expansion cards. Slot 1 is part of the mainboard, as is the C100-C1FF ROM. This ROM contains the drivers for the serial and parallel interfaces, which are addressed as slot 1 and 9. The monitor up until AppleSoft and a DOS patcher make PR#9 work. [...] it's just 256 bytes which are completely listed on four pages in the manual [...]. Every Basis 108 has this ROM inside, even without any expansion cards installed, even the cut-down version which only had a 2K monitor ROM".

Quote
"This is the "Slot 1" ROM from the Basis 108 as a hexdump, typed in from the manual."

Code
C100: 20 62 C1 90 28 48 21 48 48 A5 39 C9 C1 D0 15 68

C110: A9 14 85 38 20 62 C1 A9 08 2C 99 C0 F0 FB AD 98

C120: C0 49 80 60 A9 29 85 36 68 20 62 C1 38 6E F8 04

C130: EE F9 07 A5 24 CD F9 07 90 08 A9 A0 20 A3 C1 4C

C140: 30 C1 20 A0 C1 C9 0D D0 0D 20 83 C1 2C 79 06 10

C150: 05 A9 8A 20 A3 C1 2C 79 06 AD 78 04 50 41 4C F0

C160: FD 00 8D 78 04 AD F9 05 49 A5 CD 79 06 F0 19 A9

C170: 9E 8D F9 06 A9 0B 8D 79 07 A9 C0 8D 79 06 49 A5

C180: 8D F9 05 A9 00 8D F9 07 AD 79 07 CD 9A C0 F0 03

C190: 8D 9A C0 AD F9 06 CD 9B C0 F0 03 8D 9B C0 18 60

C1A0: AD 78 04 49 80 2C F8 04 10 0D 48 A9 10 2C 99 C0

C1B0: F0 FB 68 8D 98 C0 60 2C C1 C1 30 FB 8D 90 C0 60

C1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

C1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

C1E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

C1F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


Quote
"I have completely decoded the BasRam card. It functions like the Apple memory card (or for example the AE RamFactor card), but there are two important differences:


1. There is no 256 Byte I/O ROM and no 2 K firmware ROM, but instead 256 Bytes of I/O RAM

2. There is no autoincrement when reading or writing data.


This gets the Basis 108 RamDisk software running. It's not clear at this point, if the 256 bytes of I/O RAM are part of the normal 256K of the card.".

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