Editing Macintosh Performa 275

{{Infobox computer
| name         = Macintosh Performa 275
| image        = [[File:Macintosh Color Classic II.jpg]]
| caption      = Macintosh Performa 275
| manufacturer = Apple Computer, Inc.
| type         = All-in-One Personal Computer
| release_date = October 1, 1993
| discontinued = November 1, 1995
| price        = 
| cpu          = Motorola 68030 @ 33 MHz
| memory       = 4 MB RAM (expandable to 36 MB)
| storage      = 80 MB or 160 MB SCSI hard drive, 1.44 MB floppy drive
| display      = 10" Sony Trinitron color CRT (512×384 pixels)
| sound        = Stereo 8-bit
| dimensions   = 14.5" H × 9.9" W × 12.6" D (36.8 cm × 25.1 cm × 32 cm)
| weight       = 22.5 lbs (10.2 kg)
| os           = System 7.1 – Mac OS 7.6.1
| predecessor  = [[Macintosh Performa 250|Performa 250]]
| successor    = 
| codename     = 
| model        = M1600
}}

The '''Macintosh Performa 275''' is a consumer-oriented compact Macintosh computer introduced by Apple Computer on October 1, 1993.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_performa/specs/mac_performa_275.html |title=Macintosh Performa 275 Specs |publisher=EveryMac.com |access-date=2026-02-10}}</ref> It is a rebranded version of the [[Macintosh Color Classic II]], sold in Asia through consumer retail channels as part of Apple's Performa line. Both models were exclusively available outside the United States.

== Relationship to Color Classic II ==

The Performa 275 shares the same logic board, case design, and specifications as the [[Macintosh Color Classic II]]. The Color Classic II was sold in Japan, Canada, and Europe, while the Performa 275 was marketed in Asian markets.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_classic/specs/mac_colorclassic_ii.html |title=Macintosh Color Classic II Specs |publisher=EveryMac.com |access-date=2026-02-10}}</ref>

The Color Classic II represents a significant upgrade over the original Color Classic, featuring a faster 33 MHz processor with a full 32-bit data path and support for substantially more RAM.

== Architecture and Processor ==

The Performa 275 uses the Motorola 68030 processor running at 33 MHz with a 32-bit data bus—a significant improvement over the 16-bit data path of the original Color Classic. The system bus operates at 33 MHz.

An LC PDS (Processor Direct Slot) provides expansion capability, compatible with LC-series expansion cards. An optional 68882 FPU could be installed.

=== Memory ===

* '''Standard RAM:''' 4 MB soldered on logic board
* '''Maximum RAM:''' 36 MB (4 MB onboard + 32 MB via single 72-pin SIMM)
* '''RAM Type:''' 72-pin SIMM, 80 ns or faster
* '''RAM Slots:''' 1
* '''ROM:''' 1 MB

The switch to 72-pin SIMMs and a single slot simplified RAM upgrades while allowing much greater expansion than the original Color Classic.

=== Video Memory ===

* '''Standard VRAM:''' 256 KB
* '''Maximum VRAM:''' 512 KB (with optional 256 KB VRAM SIMM)

=== Storage ===

* '''Floppy Drive:''' 1.44 MB SuperDrive (auto-inject)
* '''Hard Drive:''' 80 MB or 160 MB internal SCSI
* '''SCSI Interface:''' Internal and external SCSI ports

== Display ==

The Performa 275 includes a built-in 10" Sony Trinitron color CRT display with a resolution of 512×384 pixels. With the standard 256 KB VRAM, the display supports 256 colors; expanding to 512 KB enables 32,768 colors.

== Input/Output ==

* '''Keyboard Port:''' ADB (Apple Desktop Bus)
* '''Mouse Port:''' ADB
* '''Serial Ports:''' 2× Mini DIN-8 (printer and modem)
* '''SCSI Port:''' DB-25 external SCSI
* '''Audio:''' Stereo speakers, 3.5mm headphone jack, microphone input
* '''Expansion:''' LC PDS slot

== General Maintenance ==

For detailed maintenance practices including cleaning, PRAM battery management, connector corrosion prevention, and voltage adjustments, refer to the dedicated [[Macintosh Color Classic II General Maintenance]] page.

== Capacitor Replacement Guide ==

Detailed capacitor replacement guidelines for both analog and logic boards can be found on the [[Macintosh Color Classic II Capacitor Replacement Guide]] page.

== Troubleshooting ==

A comprehensive troubleshooting guide addressing no power, chime but no video, intermittent operation, Sad Mac errors, and floppy drive problems is available on the [[Macintosh Color Classic II Troubleshooting]] page.

== Retrobrite ==

To address plastic yellowing, detailed instructions can be found on the [[Retrobrite]] page.

== Technical Details ==

<templatestyles src="Template:StyledTable/styles.css" />

=== System Architecture at a Glance ===

{| class="wikitable styled-table" style="width:90%; text-align:center;"
! Sub-system !! Specification
|-
| '''CPU''' || Motorola 68030 @ 33 MHz
|-
| '''Bus width''' || 32-bit data • 32-bit address
|-
| '''ROM''' || 1 MB
|-
| '''RAM''' || 4 MB (expandable to 36 MB)
|-
| '''VRAM''' || 256 KB (expandable to 512 KB)
|-
| '''Video''' || 512 × 384 color (256 or 32,768 colors)
|-
| '''Sound''' || 8-bit stereo
|-
| '''Disks''' || 1.44 MB 3.5" floppy, 80/160 MB SCSI HDD
|-
| '''Ports''' || ADB × 2, Serial × 2, SCSI, LC PDS
|}

== References ==

<references />

== See Also ==

* [[Macintosh Color Classic II]]
* [[Macintosh Color Classic II General Maintenance]]
* [[Macintosh Color Classic II Troubleshooting]]
* [[Macintosh Color Classic II Capacitor Replacement Guide]]
* [[Macintosh Performa 250|Performa 250]]

[[Category:Apple Vintage Computers]]
[[Category:Compact Macintosh]]