system. Apple IIe compatibility Tandy wanted to compete in the education, school and home markets dominated by the Apple IIe. In 1987, the company partnered with Diamond and through Radio Shack sold the Diamond Trackstar 128 series Apple IIe compatibility board for $399, and offered free installation in their Tandy 1000 series. This peripheral is similar to the Apple IIe Card sold later for certain Macintosh models; it is a fully functional Apple IIe clone with 128KB RAM and 6502 CPU and double high-resolution graphics, which allows Tandy 1000 computers to run software written for the Apple IIe and IIc platform. It was also marketed to home users and businesses interested in having both MS-DOS and Apple II compatibility. The board has a pass-through RGB cable and floppy drive cable, and requires an open 10-inch 8-bit ISA slot, and uses a boot disk to boot into Apple mode. The boot disk has both DOS and Apple software and is copy-protected. Compatibility is fairly good and allows Tandy 1000 owners to run most Apple II software on their Tandy 1000 machine for less than the cost of owning separate IBM PC and Apple II systems. Many Tandy 1000s sold to schools came with the Diamond Trackstar 128 installed, and home owners also purchased this for compatibility with both DOS and Apple II software. System specifications Full-size desktop systems Compact and all-in-one systems Selected models Tandy 1000 The original Tandy 1000 is a large computer almost the size of the , though with a plastic case over an aluminium lower chassis to reduce weight. It came standard with one internal 5.25" double-density floppy disk drive, with an additional exposed internal bay usable for the installation of a second 5.25" disk drive (available as a kit from Radio Shack). The floppy drives use jumpers to select the drive number instead of the IBM cable twist. The standard memory is , with the computer accepting up to of total memory with the addition of expansion cards. MS-DOS 2.11, DeskMate 1.0, and a keyboard with the same layout as the Tandy 2000's are included with the computer. Like the PCjr, the Tandy 1000 motherboard does not supply DMA, but unlike that system, it can have DMA added with a memory expansion board. While the Tandy 1000 has three XT-compatible expansion slots, early Tandy memory upgrade boards take up two of the slots to get to