Macintosh SE FDHD
 | |
| Macintosh SE FDHD | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | All-in-one Personal Computer |
| Released | August 1, 1989 |
| Discontinued | October 15, 1990 |
| Intro price | US$3,700 |
| CPU | Motorola 68000 @ 7.83 MHz |
| Memory | 1 MB RAM (expandable to 4 MB) |
| Storage | 20 MB or 40 MB SCSI hard drive |
| Display | 9" monochrome CRT (512×342 pixels) |
| Sound | Four-voice, 8-bit, 22 kHz sampling; output for an external amplifier |
| Dimensions | 13.6" H × 9.6" W × 10.9" D (34.5 × 24.4 × 27.6 cm) |
| Weight | 17–21 lb (7.7–9.5 kg), depending on drives fitted |
| OS / Firmware | System 3.3 – 7.5.5 |
| Predecessor | Macintosh SE |
| Successor | Macintosh SE/30 |
| Model no. | M5011 |
The Macintosh SE FDHD (FDHD = Floppy Disk High Density) is a compact Macintosh computer released on August 1, 1989.[1] It was the first compact monochrome Macintosh to include a high-density 1.44 MB "SuperDrive" floppy disk drive, replacing the 800K drive found in the original Macintosh SE.
The SE FDHD shares the same chassis and overall design as the standard SE but incorporates the updated disk drive and ROM to support high-density floppy disks.
Hardware Overview
[edit | edit source]Processor and Memory
[edit | edit source]The SE FDHD uses a Motorola 68000 processor running at 7.83 MHz with a 16-bit data path. It ships with 1 MB of RAM and can be expanded to 4 MB using four 30-pin SIMM slots. RAM must be installed in matching pairs.
Storage
[edit | edit source]The system includes a 1.44 MB SuperDrive floppy disk drive that can read and write both 800K and 1.44 MB disks. Internal hard drive options include 20 MB or 40 MB SCSI drives.
Display
[edit | edit source]The built-in 9" monochrome CRT displays a resolution of 512×342 pixels.
Expansion
[edit | edit source]Like the standard SE, the FDHD features an SE PDS (Processor Direct Slot) for expansion cards such as accelerators or Ethernet adapters.
General Maintenance
[edit | edit source]For detailed maintenance practices including cleaning, PRAM battery management, connector corrosion prevention, and voltage adjustments, refer to the dedicated General Maintenance page.
Troubleshooting
[edit | edit source]A comprehensive troubleshooting guide addressing no power, chime but no video, intermittent operation, Sad Mac errors, and floppy drive problems is available on the Troubleshooting page.
Capacitor Replacement Guide
[edit | edit source]Detailed capacitor replacement guidelines can be found on the Capacitor Replacement Guide page.
Apple service data
[edit | edit source]Apple's own figures for the Macintosh SE, which cover the FDHD, from the Service Source volume hosted on this wiki.[2]
| Item | Apple's figure |
|---|---|
| Processor | Motorola 68000 at 7.83 MHz — from a 15.6672 MHz master oscillator, halved. The "8 MHz" usually quoted is a rounding |
| RAM | 1 or 2 MB, expandable to 4 MB |
| ROM | 256K |
| PRAM | 256 bytes; CMOS custom chip with a seven-year lithium battery; replace below 2.8 V |
| Storage | 1.4 MB floppy drive; optional second internal and external floppy; optional 20 or 40 MB hard drive |
| Expansion | Macintosh SE expansion slot, 96-pin Euro-DIN |
| SCSI / ADB / serial | 50-pin internal and DB-25 external SCSI; two ADB connectors; two RS-232/RS-422 serial ports at 230.4 Kbaud, mini DIN-8 |
| Sound | Four-voice, 8-bit digital-to-analogue conversion at a 22 kHz sampling rate |
| Line voltage | 90–140 VAC; 170–270 VAC, 47–63 Hz |
| Maximum power | 100 W |
| Case | 13.6 × 9.6 × 10.9 in. (34.5 × 24.4 × 27.6 cm); 17–21 lb. (7.7–9.5 kg) |
| Adjustments | Yoke and Video only — no voltage adjustment and no rail-tolerance table |
Apple's Upgrades chapter covers the 1.4 MB drive upgrade for an existing 800K machine, and notes that all 1.4 MB floppy drives need the drive shields — a detail easily lost when swapping a drive into an older SE.[2]
The PRAM cell is lithium: Apple warns it "could explode" if handled or discarded improperly, and the right neutraliser for leakage is sodium bicarbonate, not vinegar. Vinegar is correct only on the 4.5 V alkaline packs in the Macintosh 128K, 512K and Plus.
See Also
[edit | edit source]References
[edit | edit source]- ↑ Macintosh SE FDHD Specs, EveryMac.com—link(accessed 2026-02-10)
- ↑ 2.0 2.1 Apple Computer, Macintosh SE, Service Source. Hosted here as Macintosh SE Service Source (File:Macintosh_se.pdf). Specifications, Adjustments and Additional Procedures — Battery Verification chapters.