Commodore Amiga A1000 - Device I.D.

Device I.D.
This interface supports a method of establishing the type of disk(s)
attached. The I.D. sequence is as follows.
1. Drive MTRXD- low.
2. Drive SELxB- low
3. Drive SELxB- high.
4. Drive MTRXD- high.
5. Drive SELxB- low
6. Drive SELxB- high.
7. Drive SELxB- low
8. Read and save state of RDY.
9. Drive SELxB- high.
Repeat steps 6 to 9, 15 times more.
Convert the 16 values of RDY- into a 16-bit word. The most significant
bit is the first value and so on. This 16-bit quantity is the device I.D.
The following I.D.s are defined:
0000 0000 0000 0000 Reserved
1111 1111 1111 1111 Amiga standard 3.25
1010 1010 1010 1010 Reserved
0101 0101 0101 0101 48 TPI double-density, double-sided
1000 0000 0000 0000 Reserved
0111 1111 1111 1111 Reserved
0000 1111 xxxx xxxx Available for users
1111 0000 xxxx xxxx Extension reserved
xxxx 0000 0000 0000 Reserved
xxxx 1111 1111 1111 Reserved
0011 0011 0011 0011 Reserved
1100 1100 1100 1100 Reserved
- Appendix I 357 –