diff options
Diffstat (limited to 'baremetal/bos/print-mem-real-mode.hex')
| -rw-r--r-- | baremetal/bos/print-mem-real-mode.hex | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/baremetal/bos/print-mem-real-mode.hex b/baremetal/bos/print-mem-real-mode.hex deleted file mode 100644 index 3610308c..00000000 --- a/baremetal/bos/print-mem-real-mode.hex +++ /dev/null @@ -1,67 +0,0 @@ -# Experiment: write to video RAM from 16-bit real mode. And it works. -# -# To convert to a disk image: -# ./bootstrap run apps/hex < baremetal/bos/print-mem-real-mode.hex > boot.bin -# To run: -# qemu-system-i386 boot.bin -# Or: -# bochs # reads bochsrc, which loads boot.bin - -# - figure 4.1 of https://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf in protected mode -# edx <- 0xb8000 -# al <- 'H' -# ah <- 0x0f # white on black -# *edx <- ax - -# - translating to real mode -# bx <- 0xb800 -bb 00 b8 -# ds <- bx -8e db # 11b/mod 011b/reg/ds 011b/rm/bx -# al <- 'H' -b0 48 -# ah <- 0x0f # white on black -b4 0f -# bx <- 0 -bb 00 00 -# *ds:bx <- ax -89 07 # 00b/mod/indirect 000b/reg/ax 111b/rm/bx - -e9 fd ff # loop forever - -# padding to 512 bytes - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 - -55 aa # final 2 bytes: boot sector marker - -# vim:ft=subx |