played a guitar chord strummed by jazz guitarist Stanley Jordan, and instead of the "Chimes of Doom" arpeggio that played when there was a hardware error at startup, there was the sound of a car crashing and glass breaking. This and the other NuBus-based Power Macintosh models (7100, 8100 and Workgroup Server 9150) were replaced by the Power Macintosh PCI series released in 1995, although the 6100 DOS compatible continued in production until 1996. By this time Apple had already released the anticipated "PC Personality Card" that plugged into one of the PCI slots of the newer Power Macs, featuring a 100 MHz Pentium processor. The 6100 was the slowest Power Macintosh in terms of processor speed upon introduction. Eventually, the 6100 series was able to be upgraded through third-party solutions such as Sonnet Technologies Crescendo G3 NuBus (up to 500 MHz) and G4 NuBus (up to 360 MHz; discontinued) and Newer Technology's MaxPower G3 processor upgrades. Early models had a CD eject button that would stick in. This was rectified on later models with a subtly re-profiled button moulding. Models The original Power Macintosh 6100 is based on the 60 MHz PowerPC 601 processor. The base model was complemented by an AV version, which included an add-on card fitted in its Processor Direct Slot that added audio and visual enhancements such as composite and S-video input/output and full 48 kHz 16-bit DAT-resolution sound processing. A double-speed CD-ROM is included as standard. A series of Performa models based on the 6100/60 were shipped in October 1994, collectively known as the "Performa 6100 series." All Performas included an Apple Multiple Scan 15 Display, an AppleDesign Keyboard, and a suite of pre-installed software including Quicken, MacLinkPlus, American Heritage Dictionary, and Apple's eWorld online service. CD-ROMs included with all Performas included Electronic Arts' 3D World Atlas and a variety of software for children. The Performas vary only in their hard drive size and which of two software bundles are included. Software bundle 1: ClarisWorks, clip art collections, and Now Software's Up-To-Date and Contact. Software bundle 2: Microsoft Works, Mavis Beacon Teaches Typing, Kid Works, Thinkin' Things, The Writing Center, Fractal Dabbler, Spaceway 2000, San Diego Zoo Presents... the Animals!, Wacky Jacks CD Gameshow. Introduced March 14, 1994: Power Macintosh 6100/60 Power Macintosh 6100/60AV Introduced April 25, 1994: Apple Workgroup Server 6150 Introduced November 1, 1994: Macintosh Performa 6110CD: Same specifications as the 6100/60;