PowerBook 540
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| PowerBook 540c (Danamania, Wikimedia Commons, CC BY-SA 2.5) | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Notebook computer |
| Released | 16 May 1994 |
| Discontinued | 17 October 1994 (540); 26 August 1995 (540c) |
| Intro price | US$3,160 (540); US$4,840 (540c) |
| CPU | Motorola 68LC040, 66/33 MHz, on a plug-in daughterboard |
| Memory | 4 MB on the daughterboard; one RAM card slot; 36 MB maximum |
| Storage | 1.4 MB SuperDrive; 2.5-inch SCSI hard disk |
| Display | 9.5-inch active-matrix LCD, 640 × 480; greyscale (540) or colour (540c) |
| Sound | — |
| ROM | 2 MB |
| Power | One or two 9.6 V NiMH intelligent batteries; 40 W power adapter |
| Dimensions | 2.25 × 11.5 × 9.65 in (5.7 × 29.2 × 24.5 cm) |
| Weight | 7.3 lb (3.3 kg) with two batteries |
| OS / Firmware | System 7.1.1 to Mac OS 8.1 |
| Successor | PowerBook 5300 |
| Codename | Blackbird |
The PowerBook 540 and PowerBook 540c are the active-matrix models of Apple's PowerBook 500 series, introduced on 16 May 1994 alongside the passive-matrix PowerBook 520 and 520c.[1][2] Both use a Motorola 68LC040 with a 33 MHz bus clock and a 66 MHz internal clock, on a removable daughterboard, a 9.5-inch 640 × 480 active-matrix display, a trackpad, built-in Ethernet and two battery bays for Apple's NiMH "intelligent" batteries.[3] Apple's code name for the series was Blackbird.[4] The 540 was dropped in October 1994; the 540c stayed on sale until August 1995.[1][2]
Apple sold a PowerPC 603e daughterboard as an upgrade for the whole series.[5] The faults owners report most are in the batteries, the power adapters, the display plastics and the displays themselves; see Known problems.
Models
[edit | edit source]| Item | PowerBook 540 | PowerBook 540c |
|---|---|---|
| Display | Active-matrix greyscale, 640 × 480. Apple's Service Source gives 16 grey levels; Apple's specification page says up to 64 greys at the 8-bit setting[5][1] | Active-matrix colour; 640 × 400 at thousands of colours, 640 × 480 at 256 colours[5] |
| Hard disk as shipped | 240 MB[3] | 320 MB; 240-500 MB over the production run[3][2] |
| Batteries supplied | Two[3] | Two[3] |
| Internal modem | Optional; fitted in the 12 MB configuration[3] | Optional; fitted in the 12 MB configuration[3] |
| Introductory price | US$3,160[4] | US$4,840[6] |
The PowerBook 520 and 520c are the same machine with a 50/25 MHz processor and passive-matrix displays; they are covered on PowerBook 520. The 550c, sold only in Japan, has a full 68040 and a larger 10.4-inch display.[7]
Specifications
[edit | edit source]| Item | Specification |
|---|---|
| Processor | Motorola MC68LC040, 66/33 MHz (520 and 520c: 50/25 MHz); no FPU; 32-bit address and data buses |
| RAM | 4 MB on the daughterboard; to 12 MB with Apple's 8 MB card, to 36 MB with third-party cards |
| ROM | 2 MB |
| PRAM | 256 bytes |
| Video RAM | 512K |
| Clock | CMOS custom chip with long-life lithium battery |
| Floppy drive | Internal 15 mm 1.4 MB Apple SuperDrive |
| Hard drive | 2.5-inch SCSI, 160, 240 or 320 MB |
| Ports | HDI-30 SCSI (1.5 MB/s); ADB (200 mA maximum for all devices); RS-422 serial (mini DIN-8); stereo sound in and out; video out, 8-bit, for Macintosh, VGA and SVGA monitors; Apple AAUI Ethernet; power adapter; optional internal modem |
| Expansion | 90-pin processor-direct slot in the left battery bay, for the PCMCIA expansion module (two Type I or II cards, or one Type III) |
| Keyboard | 76 keys (US), 77 keys (ISO), 12 function keys; two tilt positions |
| Pointing device | Solid-state trackpad |
| Sound | Apple sound chip, 16-bit stereo; built-in stereo speakers; electret microphone |
| Batteries | One or two NiMH batteries, up to 3.5 hours each; recharge 2 hours shut down or asleep, 4 hours while running |
| Power adapter | 110-240 V AC, 50-60 Hz, 40 W |
| Size | 2.25 in (5.7 cm) high, 11.5 in (29.2 cm) wide, 9.65 in (24.5 cm) deep |
| Weight | 7.3 lb (3.3 kg) with two batteries (540 and 540c); 6.4 lb (2.9 kg) with one battery (520 and 520c) |
| Internal modem | 19.2 kbit/s data, 14.4 kbit/s fax |
Apple's own figures differ between documents. The developer note gives the batteries as 9.6 V 1.9 Ah, the weight as 6.3 lb with one battery and 7 lb with two, and the size as 11.3 × 9.5 × 2.3 in.[3] The specification pages give 7.1 lb for the 540 and 7.3 lb for the 540c.[1][2]
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Hardware
[edit | edit source]Logic boards
[edit | edit source]The main electronics are on two boards. The daughterboard carries the 68LC040, the 4 MB of self-refreshing DRAM, the 2 MB ROM, the RAM card connector and Apple's Pratt memory controller, which translates the 68040 bus into the 68030-style bus of the motherboard.[3] The motherboard carries the Whitney peripheral IC (VIA, SWIM II floppy controller, interrupts, clocks and power control), the Combo IC (serial and SCSI), the Singer sound codec, the Keystone and Ariel external video ICs, a Chips and Technologies 65220 display controller and the Power Manager, a 68HC05 microcontroller with its own RAM and ROM that handles sleep, power switching, keyboard scanning, display brightness and battery charging.[3] Apple lists two motherboards, 661-0054 (Rev A) and 661-0108 (Rev B), and a fuse, 922-1116, on the motherboard.[5]
The daughterboard plugs into the motherboard below the RAM card connector. Apple removes it with an IC extractor bent out to a wide grip, pulling on the notches at each end, and warns against prising it up with a screwdriver.[5] One owner found that a 540c which only spun its hard disk had been left with the daughterboard unplugged.[8]
Memory
[edit | edit source]The RAM card for the 500 series is not interchangeable with cards for earlier PowerBooks. Apple's own card was 8 MB, and the exploded view lists the RAM card as 661-0058; third-party cards took the total to 36 MB.[3][5] The card and its connector are keyed. Apple warns that a card forced in the wrong way can damage the daughterboard, and that pressure on the card's components when pressing it home can ruin it; press only above the connector.[5]
Display
[edit | edit source]All four displays are lit by a cold-cathode fluorescent lamp driven from an inverter board in the display housing.[3] Apple sold a 540c display assembly as an upgrade for the 520, 520c and 540, fitted as a complete display assembly.[5] Owners have swapped 540c displays into 520c machines the same way.[8]
The 540's greyscale panel is a Hosiden active-matrix display. MacDat lists the PowerBook 540 among the machines whose Hosiden greyscale panels develop "tunnel vision", a dark vignette that grows from the corners as the panel warms up.[9]
Batteries and expansion bay
[edit | edit source]Each bay takes a PowerBook Intelligent Battery, a 9.6 V 1.9 Ah NiMH pack with a processor inside that reports its charge to the Power Manager.[3] The left bay also holds the 90-pin processor-direct slot used by the PCMCIA expansion module.[3][5] The module went through three revisions. Apple's notes on its PowerPC card say Rev. A and B modules do not work with the upgraded processor, and owners of those were offered a free Rev. C module.[5]
A separate backup battery under the top case keeps the PRAM and power management data while the main batteries are out; the computer recharges it.[5] See PowerBook 540 General Maintenance.
PowerPC upgrade
[edit | edit source]Apple's Macintosh PowerBook Processor Card Upgrade replaces the daughterboard with one carrying a 100 MHz PowerPC 603e, and needs System 7.5.2 or later.[5] Apple's specification for an upgraded machine gives 8 MB on the card, 40 MB maximum, a 4 MB ROM and Mac OS 7.5.2 to 8.0.[10] Newer Technology also made 117, 167 and 183 MHz cards.[7]
Known problems
[edit | edit source]- The plastics are brittle. Owners report the bottom of the display housing splitting where the back cover joins the bezel, the cover between the display and the keyboard coming loose, and the dark hinge (clutch) covers breaking when they are removed without squeezing them.[11] See PowerBook 540 General Maintenance.
- Old batteries leak. One owner found a 540c battery module whose leakage had eaten the plastic between its contacts.[12]
- The power adapters fail. MacDat found leaking capacitors in 500-series adapters and some that still would not work after a recap.[13]
- Greyscale 540 panels develop tunnel vision, and old panels of all four types suffer from "vinegar syndrome", the breakdown of the polariser adhesive.[9][14] One owner rebuilt the display of a corroded 540c by replacing its polariser.[15]
Fault-finding is on PowerBook 540 Troubleshooting and capacitor values on PowerBook 540 Capacitor Replacement Guide.
Maintenance and repair
[edit | edit source]These pages cover the whole 500 series (520, 520c, 540 and 540c):
- PowerBook 540 General Maintenance
- PowerBook 540 Troubleshooting
- PowerBook 540 Capacitor Replacement Guide
Documentation
[edit | edit source]- PowerBook 500 Series Service Source: Apple's service manual for the 520, 520c, 540 and 540c.
- PowerBook 520 and 540 Developer Note: Apple's hardware description for developers.
- PowerBook 520, 520c, 540 and 540c Getting Started: the owner's manual.
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Related pages
[edit | edit source]References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 Apple, "Macintosh PowerBook 540: Technical Specifications" (retrieved 2026-10-02). 68LC040 at 66/33 MHz, no FPU; 4 MB on board, one PB5xx RAM slot, 4-36 MB, 70 ns; 512K VRAM; 40 W, 100-240 V; battery type PB500 NiMH; introduced 5/16/1994, discontinued 10/17/1994; 7.1 lb; 2.3 × 11.5 × 9.7 in; Gestalt ID 72; ROM 2 MB; original system 7.1.1 with the PowerBook 500 Series Enabler; Mac OS 7.1.1 to 8.1; minimum internal hard disk 240 MB; note that at the 8-bit setting the 540's LCD shows up to 64 greys.
- ↑ 2.0 2.1 2.2 2.3 Apple, "Macintosh PowerBook 540c: Technical Specifications" (retrieved 2026-10-02). Introduced 5/16/1994, discontinued 8/26/1995; 7.3 lb; internal LCD 640 × 400 at 16 bits and 640 × 480 at 8 bits; minimum internal hard disk 240-500 MB; otherwise as the 540.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 Apple Computer, Developer Note: PowerBook 520 and 520c and PowerBook 540 and 540c Computers (Developer Press, May 1994), hosted here as File:PowerBook 520 and 540 Developer Note (1994).pdf (see PowerBook 520 and 540 Developer Note). PDF page numbers (printed page plus 14): features and configurations, chapter 1 (pp. 15-19); Pratt, Whitney, Combo, Singer, Keystone and Ariel ICs and the 68HC05 Power Manager, chapter 2 (pp. 24-28); trackpad (p. 36); Ethernet port (p. 44).
- ↑ 4.0 4.1 Low End Mac, "PowerBook 540" (retrieved 2026-10-02). Code name Blackbird; introduced 16 May 1994 at US$3,160, discontinued 17 October 1994; power supply M1893 or M1910. Secondary source.
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 Apple Computer, PowerBook 500 Series Service Source (180 pp., this copy last modified July 2002), hosted here as File:PowerBook 500 Series Service Source.pdf (see PowerBook 500 Series Service Source). PDF page numbers: General Information p. 3; Rear Panel p. 8; screw matrix pp. 9-10; Battery Information pp. 14-16; Specifications pp. 19-30; symptom charts pp. 33-60; startup flowchart pp. 61-62; Take Apart pp. 64-153; Upgrades pp. 155-171; Additional Procedures pp. 173-178; Exploded View p. 180.
- ↑ Low End Mac, "PowerBook 540c" (retrieved 2026-10-02). Introduced 16 May 1994 at US$4,840, discontinued 26 August 1995; 320 MB or 500 MB hard drive. Secondary source.
- ↑ 7.0 7.1 Wikipedia, "PowerBook 500 series" (revision 1376591653, retrieved 2026-10-02). History: introduction of the 540c on 16 May 1994, the August 1995 changes to the range, the Japan-only 550c, Newer Technology's PowerPC upgrades and the PCMCIA module revisions. Used for history only.
- ↑ 8.0 8.1 TinkerDifferent forum thread "PowerBook 540c screen in a 520c?", eric, This Does Not Compute and others, January 2022 to May 2024. A 540c display fitted to a 520c; a dead 540c whose CPU card had been left unseated. Community experience.
- ↑ 9.0 9.1 MacDat Knowledge Base, "LCD Tunnel Vision" (retrieved 2026-10-02). Affects Hosiden TFT panels, mainly greyscale ones: Macintosh Portable, PowerBook 170, 180, Duo 250, Duo 280 and 540; usual remedy of baking the panel at 100 °C for a few hours and its limits. Secondary source.
- ↑ Apple, "Macintosh PowerBook 500 with PowerPC: Technical Specifications" (retrieved 2026-10-02). 603e at 100 MHz; 8 MB on board, 8-40 MB; ROM 4 MB; original system 7.5.2 with the PowerBook 5300/2300/190 Enabler; Mac OS 7.5.2 to 8.0; introduced 8/26/1995; Gestalt ID 126.
- ↑ TinkerDifferent forum thread "Powerbook 540C with powerPC, What now?", lsi-aigisx86, clay and others, September 2026. Community experience: brittle display and hinge-cover plastics; clay recalls few capacitors on the main board and inverter capacitors that can leak, with no leakage in his two 540s; parts inside an AC adapter that shattered like glass when it was opened.
- ↑ TinkerDifferent forum thread "Proper handling of laptop batteries in vintage machines", wottle, Androda and starlite, August-September 2022. A leaking PowerBook 540c battery module; storing NiCd and NiMH packs out of the machine. Community experience.
- ↑ MacDat Capacitor Reference Library, "PowerBook 500 Series AC Adapter" (retrieved 2026-10-02). C1, C2 100 µF 200 V; C308A, C308B 330 µF 25 V; C14A, C14B 100 µF 25 V; C802 47 µF 25 V; opening the brittle case; adapters that failed after a recap. Photograph by Fizzbinn. Secondary source.
- ↑ MacDat Knowledge Base, "LCD Vinegar Syndrome" (retrieved 2026-10-02). PVA polariser adhesive breaking down into acetic acid; symptoms on active and passive matrix panels; replacing the film (ordinary polariser for active matrix, FSTN film with a retarder layer for passive matrix). Secondary source.
- ↑ TinkerDifferent forum thread "Fixing Vinegar Syndrome on a PB 540c", TheBasement, techknight and others, November-December 2023. Replacing the polariser on a 540c display; applicator fluid for laying new film. Community experience.