Macintosh Performa 450
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| Macintosh Performa 400; the Performa 450 uses the same case. Photo: Akbkuku, Wikimedia Commons, CC BY 4.0 | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Desktop personal computer |
| Released | April 12, 1993 |
| Discontinued | November 1, 1993 (EveryMac) |
| Intro price | US$1,800 (EveryMac) |
| CPU | Motorola 68030 at 25 MHz; PLCC socket for a 68882 FPU |
| Memory | 4 MB on board, one 72-pin SIMM socket, 36 MB maximum |
| Storage | 80 or 120 MB SCSI hard drive; 1.4 MB SuperDrive |
| Display | External; 512 KB VRAM on board, 768 KB with a VRAM SIMM |
| Sound | 8-bit mono |
| ROM | 1 MB |
| Dimensions | 7.7 × 31.0 × 38.2 cm (3.0 × 12.2 × 15.0 in) |
| Weight | 4.0 kg (8.8 lb) |
| OS / Firmware | System 7.1P2 – Mac OS 7.6.1 |
| Model no. | M1254 |
The Macintosh Performa 450 is a desktop Macintosh sold by Apple through consumer retail shops. It is the Macintosh LC III under a Performa name.[1] Against the Performa 430 it has a 25 MHz processor on a 32-bit bus, a single 72-pin SIMM socket for up to 36 MB, 1 MB of ROM, a coprocessor socket and a 114-pin expansion slot.[2] Low End Mac records that the 450 was replaced by the Performa 460 in October 1993.[1]
Apple gives the introduction date as April 12, 1993, with System 7.1P2 and System Enabler 308 as the original system software.[3] EveryMac gives a US price of US$1,800, discontinuation on November 1, 1993, order number M1698LL/A and model number M1254.[4]
Specifications
[edit | edit source]| Item | Figure |
|---|---|
| Processor | Motorola 68030 at 25 MHz; 32-bit data bus; coprocessor socket |
| RAM | 4 MB on board; one 72-pin SIMM socket for 1, 2, 4, 8, 16 or 32 MB SIMMs of 80 ns or faster; 36 MB maximum |
| ROM | 1 MB |
| VRAM | 512 KB on the board; one VRAM SIMM socket takes a 256K SIMM for 768 KB |
| Floppy drive | Apple SuperDrive, 1.4 MB (auto-inject) |
| Hard drive at introduction | 80 or 120 MB SCSI |
| Ports | One ADB, two serial (printer and modem, mini DIN-8), SCSI DB-25, DB-15 video, sound in and out |
| Expansion | One 114-pin processor-direct slot for 020/030 cards |
| Electrical | 100–240 VAC, automatically configured; 30 W maximum (Service Source); 50 W (technical specifications) |
| Size and weight | 3.0 × 12.2 × 15.0 in (7.7 × 31.0 × 38.2 cm); 8.8 lb (4.0 kg) |
Sources: Apple's technical specifications, the Performa 400 Series Service Source, pp. 3–15, and the Macintosh LC III Developer Note, p. 2.[3][2][5]
The coprocessor socket is a PLCC socket for a 68882; no FPU is fitted as standard.[5] With the on-board 512 KB of VRAM the machine shows 256 colours at 640 × 480 and 832 × 624; with 768 KB it shows thousands. A 512K VRAM SIMM fits the socket, but only 256K of it is used.[3] The processor-direct slot has a power budget of 4 W.[5]
The PRAM battery is a 3.6 V lithium cell, Apple part 742-0011; Apple says to replace it below 3.0 V. The power supply is part 661-1733, shared with the whole LC family.[3][2]
Known faults
[edit | edit source]- Leaking surface-mount electrolytic capacitors on the logic board and in the power supply. The LC III board list is on Macintosh LC III Capacitor Replacement Guide.
- C22 on the LC III logic board, the 47 µF capacitor on the −5 V rail, is printed and fitted the wrong way round at the factory. Serial-port faults after a recap point there.[6]
- A flat PRAM battery: Apple's charts for this family put "Check batteries" first for "No video" and in the no-power entries.[2]
See Macintosh Performa 450 Troubleshooting and Macintosh LC III Troubleshooting.
Service documentation
[edit | edit source]Apple covers the Performa 450 in the Macintosh Performa 400 Series Service Source, and the same board under its LC III name in the Macintosh LC Series/Quadra 605 Service Source. The Macintosh LC III Developer Note describes the hardware.[2][5]
Related pages
[edit | edit source]- Macintosh LC III
- Macintosh Performa 450 Troubleshooting
- Macintosh LC III General Maintenance
- Macintosh LC III Capacitor Replacement Guide
- Macintosh Performa 460
References
[edit | edit source]- ↑ 1.0 1.1 Low End Mac, "Apple's Performa Line, 1992 to 1997".
- ↑ 2.0 2.1 2.2 2.3 2.4 Apple Computer, Service Source: Macintosh Performa 400 Series (1995), File:Performa 400 series.pdf; see Macintosh Performa 400 Series Service Source. Page numbers are PDF pages.
- ↑ 3.0 3.1 3.2 3.3 Apple, "Macintosh Performa 450: Technical Specifications".
- ↑ EveryMac, "Macintosh Performa 450 Specs".
- ↑ 5.0 5.1 5.2 5.3 Apple Computer, Macintosh LC III Developer Note (1993), p. 2, File:Macintosh LC III Developer Note.pdf; see Macintosh LC III Developer Note.
- ↑ Doug Brown, "The capacitor that Apple soldered incorrectly at the factory", 26 November 2024.