On some m68k-based Texas Instruments graphing calculators, high memory addresses that go beyond the physical memory can be used to access the physical memory (the address space folds itself over the physical memory). This range of addresses is called ghost space, because it mirrors the actual physical space.
For TI-89 programmers, ghost space starts from address 0x40000, and it is widely used to circumvent some of the protections introduced with the HW2 (hardware version 2) release of the calculator. This became a compatibility issue with the release of HW3 (the Ti-89 Titanium), where it is disabled, and patching the ROM (HW3Patch) becomes necessary.
Famous quotes containing the words ghost and/or space:
“Man was Cadaver’s masker, the harnessing mantle,
Windily master of man was the rotten fathom,
My ghost in his metal neptune
Forged in man’s mineral.
This was the god of beginning in the intricate seawhirl,
And my images roared and rose on heaven’s hill.”
—Dylan Thomas (1914–1953)
“The within, all that inner space one never sees, the brain and the heart and other caverns where thought and feeling dance their sabbath.”
—Samuel Beckett (1906–1989)