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335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547
# Code for the first 2 disk sectors, that all programs in this directory need:
#   - load sectors past the first (using BIOS primitives) since only the first is available by default
#     - if this fails, print 'D' at top-left of screen and halt
#   - initialize a minimal graphics mode
#   - switch to 32-bit mode (giving up access to BIOS primitives)
#   - set up a handler for keyboard events
#   - jump to start of program
#
# To convert to a disk image, first prepare a realistically sized disk image:
#   dd if=/dev/zero of=disk.img count=20160  # 512-byte sectors, so 10MB
# Create initial sectors from this file:
#   ./bootstrap run apps/hex < baremetal/boot.hex > boot.bin
# Translate other sectors into a file called a.img
# Load all sectors into the disk image:
#   cat boot.bin a.img > disk.bin
#   dd if=disk.bin of=disk.img conv=notrunc
# To run:
#   qemu-system-i386 disk.img
# Or:
#   bochs -f apps/boot.bochsrc  # boot.bochsrc loads disk.img
#
# Since we start out in 16-bit mode, we need instructions SubX doesn't
# support.
# This file contains just lowercase hex bytes and comments. Zero
# error-checking. Make liberal use of:
#   - comments documenting expected offsets
#   - size checks on the emitted file (currently: 512 bytes)
#   - xxd to eyeball that offsets contain expected bytes
#
# Programs using this initialization:
#   - can't use any syscalls
#   - can't print text to video memory (past these boot sectors)
#   - must only print raw pixels (256 colors) to video memory (resolution 1024x768)
#   - must store their entry-point at address 0x8800

## 16-bit entry point

# Upon reset, the IBM PC:
#   - loads the first sector (512 bytes)
#     from some bootable image (see the boot sector marker at the end of this file)
#     to the address range [0x7c00, 0x7e00)
#   - starts executing code at address 0x7c00

# offset 00 (address 0x7c00):
  # disable interrupts for this initialization
  fa  # cli

  # initialize segment registers
  # this isn't always needed, but the recommendation is to not make assumptions
  b8 00 00  # ax <- 0
  8e d8  # ds <- ax
  8e d0  # ss <- ax
  8e c0  # es <- ax
  8e e0  # fs <- ax
  8e e8  # gs <- ax

  # We don't read or write the stack before we get to 32-bit mode. No function
  # calls, so we don't need to initialize the stack.

# 0e:
  # load second sector from disk
  b4 02  # ah <- 2  # read sectors from disk
  # dl comes conveniently initialized at boot time with the index of the device being booted
  b5 00  # ch <- 0  # cylinder 0
  b6 00  # dh <- 0  # track 0
  b1 02  # cl <- 2  # second sector, 1-based
  b0 10  # al <- 16  # number of sectors to read; all sectors must be in a single track
  # address to write sectors to = es:bx = 0x7e00, contiguous with boot segment
  bb 00 00  # bx <- 0
  8e c3  # es <- bx
  bb 00 7e  # bx <- 0x7e00
  cd 13  # int 13h, BIOS disk service
  0f 82 8a 00  # jump-if-carry disk-error

# 26:
  # undo the A20 hack: https://en.wikipedia.org/wiki/A20_line
  # this is from https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S
  # seta20.1:
  e4 64  # al <- port 0x64
  a8 02  # set zf if bit 1 (second-least significant) is not set
  75 fa  # if zf not set, goto seta20.1 (-6)

  b0 d1  # al <- 0xd1
  e6 64  # port 0x64 <- al

# 30:
  # seta20.2:
  e4 64  # al <- port 0x64
  a8 02  # set zf if bit 1 (second-least significant) is not set
  75 fa  # if zf not set, goto seta20.2 (-6)

  b0 df  # al <- 0xdf
  e6 64  # port 0x64 <- al

# 3a:
  # adjust video mode
  b4 4f  # ah <- 4f (VBE)
  b0 02  # al <- 02 (set video mode)
  bb 05 41  # bx <- 0x0105 (graphics 1024x768x256
            #               0x4000 bit = configure linear frame buffer in Bochs emulator; hopefully this doesn't hurt anything when running natively)
            # fallback mode: 0x0101 (640x480x256)
  cd 10  # int 10h, Vesa BIOS extensions

# 43:
  # load information for the (hopefully) current video mode
  # mostly just for the address to the linear frame buffer
  b4 4f  # ah <- 4f (VBE)
  b0 01  # al <- 01 (get video mode)
  b9 07 01  # cx <- 0x0107 (mode we requested)
  bf 00 7f  # di <- 0x7f00 (video mode info)
  cd 10

# 4f:
  # switch to 32-bit mode
  0f 01 16  # lgdt 00/mod/indirect 010/subop 110/rm/use-disp16
    a0 7c  # *gdt_descriptor
  0f 20 c0  # eax <- cr0
  66 83 c8 01  # eax <- or 0x1
  0f 22 c0  # cr0 <- eax
  ea e0 7c 08 00  # far jump to initialize_32bit_mode after setting cs to the record at offset 8 in the gdt (gdt_code)

# padding
# 63:
         00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

## GDT: 3 records of 8 bytes each

# 80:
# gdt_start:
# gdt_null:  mandatory null descriptor
  00 00 00 00 00 00 00 00
# gdt_code:  (offset 8 from gdt_start)
  ff ff  # limit[0:16]
  00 00 00  # base[0:24]
  9a  # 1/present 00/privilege 1/descriptor type = 1001b
      # 1/code 0/conforming 1/readable 0/accessed = 1010b
  cf  # 1/granularity 1/32-bit 0/64-bit-segment 0/AVL = 1100b
      # limit[16:20] = 1111b
  00  # base[24:32]
# gdt_data:  (offset 16 from gdt_start)
  ff ff  # limit[0:16]
  00 00 00  # base[0:24]
  92  # 1/present 00/privilege 1/descriptor type = 1001b
      # 0/data 0/conforming 1/readable 0/accessed = 0010b
  cf  # same as gdt_code
  00  # base[24:32]
# gdt_end:

# padding
# 98:
                        00 00 00 00 00 00 00 00

# a0:
# gdt_descriptor:
  17 00  # final index of gdt = gdt_end - gdt_start - 1
  80 7c 00 00  # start = gdt_start

# padding
# a5:
                  00 00 00 00 00 00 00 00 00 00

# b0:
# disk_error:
  # print 'D' to top-left of screen to indicate disk error
  # *0xb8000 <- 0x0f44
  # bx <- 0xb800
  bb 00 b8
  # ds <- bx
  8e db  # 11b/mod 011b/reg/ds 011b/rm/bx
  # al <- 'D'
  b0 44
  # 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 fb ff  # loop forever

# padding
# c1:
   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

## 32-bit code from this point (still some instructions not in SubX)

# e0:
# initialize_32bit_mode:
  66 b8 10 00  # ax <- offset 16 from gdt_start
  8e d8  # ds <- ax
  8e d0  # ss <- ax
  8e c0  # es <- ax
  8e e0  # fs <- ax
  8e e8  # gs <- ax

  # load interrupt handlers
  0f 01 1d  # lidt 00/mod/indirect 011/subop 101/rm32/use-disp32
    f8 7d 00 00  # *idt_descriptor

  # enable keyboard IRQ
  b0 fd  # al <- 0xfd  # enable just IRQ1
  e6 21  # port 0x21 <- al

  # initialization is done; enable interrupts
  fb
  e9 01 0b 00 00  # jump to 0x8800

# padding
# ff:
                                             00

# 100:
# null interrupt handler:
  cf  # iret

# padding
# 101:
   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# 110:
# keyboard interrupt handler:
  # prologue
  fa  # disable interrupts
  60  # push all registers to stack
  # acknowledge interrupt
  b0 20  # al <- 0x20
  e6 20  # port 0x20 <- al
  # TODO: perhaps we should check keyboard status
  # read keycode into eax
  31 c0  # eax <- xor eax;  11/direct 000/r32/eax 000/rm32/eax
  e4 60  # al <- port 0x60
  # eax <- *(keyboard normal map + eax)
  8a  # copy m8 at rm32 to r8
    80  # 10/*+disp32 000/r8/al 000/rm32/eax
    00 80 00 00  # disp32
  # store eax in 'keyboard buffer'
  89  # copy r32 to rm32
    05  # 00/indirect 000/r32/eax 101/rm32/use-disp32
    30 7d 00 00  # disp32
  # epilogue
  61  # pop all registers
  fb  # enable interrupts
  cf  # iret

# padding
# 129:
                           00 00 00 00 00 00 00

# 130:
# keyboard buffer
00 00 00 00

# padding
# 134:
            00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

# 1f8:
# idt_descriptor:
  ff 00  # idt_end - idt_start - 1
  00 7e 00 00  # start = idt_start

# 1fe:
# final 2 bytes of boot sector
55 aa

## sector 2
# loaded by load_disk, not automatically on boot

# offset 200 (address 0x7e00): interrupt descriptor table
# 32 entries * 8 bytes each = 256 bytes (0x100)
# idt_start:

00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

# entry 8: clock
  00 7d  # target[0:16] = null interrupt handler
  08 00  # segment selector (gdt_code)
  00  # unused
  8e  # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate
  00 00  # target[16:32]

# entry 9: keyboard
  10 7d  # target[0:16] = keyboard interrupt handler
  08 00  # segment selector (gdt_code)
  00  # unused
  8e  # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate
  00 00  # target[16:32]

00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
# idt_end:

# offset 300 (address 0x7f00):
# video mode info:
  00 00  # attributes
  00  # winA
  00  # winB
# 304
  00 00  # granularity
  00 00  # winsize
# 308
  00 00  # segmentA
  00 00  # segmentB
# 30c
  00 00 00 00  # realFctPtr (who knows)
# 310
  00 00  # pitch
  00 00  # Xres
# 314
  00 00  # Yres
  00 00  # Wchar Ychar
# 318
  00  # planes
  00  # bpp
  00  # banks
  00  # memory_model
# 31c
  00  # bank_size
  00  # image_pages
  00  # reserved
# 31f
  00 00  # red_mask red_position
  00 00  # green_mask green_position
  00 00  # blue_mask blue_position
  00 00  # rsv_mask rsv_position
  00  # directcolor_attributes
# 328
  00 00 00 00  # physbase <== linear frame buffer

# 32c
# reserved for video mode info
                                    00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# offset 400 (address 0x8000):
# keyboard normal map:
00
#  es
   1b
#     |<--- digits -------------->| -  =  bs
      31 32 33 34 35 36 37 38 39 30 2d 3d 08
# offset 40f
#  tb q  w  e  r  t  y  u  i  o  p  [  ]
   09 71 77 65 72 74 79 75 69 6f 70 5b 5d
# offset 41c
#                                         enter
                                          0a 00
# offset 41e
#     a  s  d  f  g  h  j  k  l  ;  '  `     \
      61 73 64 66 67 68 6a 6b 6c 3b 27 60 00 5c
# offset 42c
#     z  x  c  v  b  n  m  ,  .  /
      7a 78 63 76 62 6e 6d 2c 2e 2f
# offset 436
                  00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# 500:
# keyboard shift map:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# 600:
# keyboard ctrl map:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# padding (there might be more keyboard tables)
# 700:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# 800:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
# a00:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
# offset c00 (address 0x8800)

# vim:ft=subx