A minimal piece of code required to boot to a command line interface on a Commodore Amiga.
Format
A data frame with two columns. The first column
contains the assembled code (as raw data). The
second column contains the corresponding Motorola 68000
(the main CPU of the original Commodore Amiga) assembly
syntax.
Details
The first two blocks (amigaDisk) are special and are
called the boot block. This block should contain information on the
type of disk and possibly some executable code that will be run
at boot time. This data.frame contains some minimal executable
code that will start the Amiga command line interface. On Amiga OS
\>=2.0 the screen will stay black unless a startup-sequence file is
present on the disk.
The original code is from Thomas Kessler as published by Laurent Clévy (http://lclevy.free.fr/adflib/adf_info.html).
Examples
data("boot.block.code")
## To create a basic boot block for a DD disk:
bblock <- new("amigaBlock", data =
c(as.raw(c(0x44, 0x4F, 0x53, 0x00, 0xE3, 0x3D, 0x0E, 0x73,
0x00, 0x00, 0x03, 0x70)), unlist(boot.block.code$assembled),
raw(419))
)
## The raw data preceding the executable code are
## a label, flags and a checksum.