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{{Infobox computer
{{Infobox computer
| name        = Macintosh LC II
| name        = Macintosh LC II
| image        = [[File:Macintosh LC II.jpg|250px]]
| image        = [[File:Macintosh LC II.jpg|250px|frameless]]
| caption      = Macintosh LC II
| caption      = Macintosh LC II
| manufacturer = Apple Computer, Inc.
| manufacturer = Apple Computer, Inc.
| type        = Personal Computer
| type        = Desktop personal computer
| release_date = March 23, 1992
| release_date = 23 March 1992
| discontinued = March 15, 1993
| discontinued = 15 March 1993
| price        = US$1,699
| price        = US$1,699 (4 MB RAM, 40 MB hard disk)
| cpu          = Motorola 68030 @ 16 MHz
| cpu          = Motorola 68030 at 16 MHz (15.6672 MHz), 16-bit data path
| memory      = 4 MB RAM (expandable to 10 MB)
| fpu          = None; decoding for an optional 68882 on a PDS card
| storage      = 40 MB, 80 MB, or 160 MB SCSI HDD, 1.44 MB SuperDrive
| memory      = 4 MB on the logic board, two 30-pin SIMM slots, 10 MB usable maximum (100 ns)
| display      = 512×384 (8-bit) or 640×480 (8-bit with 512K VRAM)
| rom          = 512 KB, socketed
| sound       = 8-bit stereo input/output
| graphics    = Built in (DB-15), 256 KB or 512 KB VRAM SIMM
| dimensions  = 2.9" H × 12.2" W × 15.3" D
| storage      = 40, 80 or 160 MB internal SCSI hard disk
| weight      = 8.8 lbs (4.0 kg)
| media        = 1.4 MB Apple SuperDrive
| os          = System 6.0.8 – System 7.6.1
| sound        = 8-bit mono input and output
| expansion    = 96-pin processor-direct slot (4 W)
| ports        = ADB, two RS-232/RS-422 serial (mini DIN-8), SCSI (DB-25), video (DB-15), sound in, sound out
| power       = 100–240 V AC auto-configured, 47–63 Hz, 50 W maximum
| dimensions  = 3.0 × 12.2 × 15.0 in (7.7 × 31.0 × 38.2 cm)
| weight      = 8.8 lb (4.0 kg)
| os          = System 6.0.8 or 7.0.1 to Mac OS 7.6.1
| predecessor  = [[Macintosh LC]]
| predecessor  = [[Macintosh LC]]
| successor    = [[Macintosh LC III]]
| successor    = [[Macintosh LC III]]
| codename    = Foster Farms
| model        = M1700 (Gestalt ID 19 under System 7.0.1, 37 under 7.1)
| model        = M1700
}}
}}
The '''Macintosh LC II''' is a personal computer released by Apple on March 23, 1992, as a direct replacement for the original [[Macintosh LC]].<ref>{{cite web |url=https://www.apple-history.com/lc_ii |title=Macintosh LC II |publisher=Apple History |access-date=2026-02-09}}</ref> The LC II upgraded the processor to a Motorola 68030, adding a PMMU (Paged Memory Management Unit) for virtual memory support while maintaining price parity with the original LC's launch price.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_lc/specs/mac_lc_ii.html |title=Apple Macintosh LC II Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>
The '''Macintosh LC II''' is a low-profile desktop Macintosh that Apple introduced on 23 March 1992 to replace the [[Macintosh LC]]. It replaces the LC's 68020 with a 68030 and doubles the memory soldered to the board to 4 MB, but keeps the LC's case, 16-bit data path, 96-pin expansion slot and 10 MB memory limit.<ref name="dn">Apple Computer, ''Macintosh LC II Computer'' Developer Note (1992), [[:File:Macintosh LC II Developer Note.pdf]] (see [[Macintosh LC II Developer Note]]): chapter 1, pp. 2-7 (major features, design differences, compatibility issues, mathematics coprocessor); chapter 2, p. 10 (ROM changes, Gestalt ID).</ref><ref name="ss-lc">Apple Computer, ''Macintosh LC Series/Quadra 605'' Service Source, [[:File:Quadra 605.lc series.pdf]] (see [[Macintosh LC Series/ Quadra 605 Service Source]]): Specifications, PDF pp. 6-17; symptom charts, PDF pp. 20-36; Take Apart, PDF pp. 38-63; Upgrades, PDF pp. 68-86; Battery Verification, PDF pp. 106-107; Exploded View, PDF p. 112.</ref> It was sold as the Performa 400, 405, 410 and 430 in the consumer market.<ref name="wp">{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_LC_II |title=Macintosh LC II |publisher=Wikipedia |access-date=2026-09-30}} Introduced 23 March 1992 at US$1,699 (Apple press release, 23 March 1992), discontinued 15 March 1993; Performa 400 introduced 14 September 1992, Performa 405 and 430 on 12 April 1993, Performa 410 on 18 October 1993; Apple's US$599 LC III logic board upgrade (Apple press release, 9 February 1993).</ref>


== Model Variants ==
== History ==


The LC II was sold under several Performa brand names for consumer markets:
Apple's launch price was US$1,699 with 4 MB of RAM and a 40 MB hard disk.<ref name="wp" /> Apple's developer note puts its performance slightly above the LC's and notes that the 68030 supports System 7's virtual memory.<ref name="dn" /> The Performa 400 followed on 14 September 1992, the Performa 405 and 430 on 12 April 1993 and the Performa 410 on 18 October 1993.<ref name="wp" /> Apple's service manual for the Performa 400 series lists the 405 and 410 with 80 MB drives and the 430 with 120 MB, and the 410 with a manual-insert floppy drive.<ref name="ss-p400">Apple Computer, ''Macintosh Performa 400 Series'' Service Source, [[:File:Performa 400 series.pdf]] (see [[Macintosh Performa 400 Series Service Source]]), Specifications, PDF pp. 3-15; exploded view, PDF p. 78.</ref> The LC III replaced the LC II in February 1993, and Apple sold an LC III logic board upgrade for it.<ref name="wp" /><ref name="ss-lc" />


* '''Performa 400''' — Base configuration
== Specifications ==
* '''Performa 405''' — With 4 MB RAM and 80 MB hard drive
* '''Performa 410''' — With 4 MB RAM and 80 MB hard drive (different bundle)
* '''Performa 430''' — With 4 MB RAM and 120 MB hard drive


All variants use the same logic board and hardware.
<templatestyles src="Template:StyledTable/styles.css" />
 
{| class="wikitable styled-table" style="width:90%;"
== Architecture and Processor ==
|+ '''Macintosh LC II specifications (Apple)'''<ref name="ss-lc" />
 
! Item !! Figure
The LC II uses a Motorola 68030 processor running at 16 MHz. Despite the upgraded processor, the LC II retains the 16-bit memory bus from the original LC, which limits memory bandwidth.<ref>{{cite web |url=https://lowendmac.com/1992/macintosh-lc-ii/ |title=Macintosh LC II |publisher=Low End Mac |access-date=2026-02-09}}</ref> The 68030 includes an integrated PMMU, enabling System 7's virtual memory feature.
|-
 
| Processor || Motorola 68030 at 16 MHz, 16-bit internal data bus, burst-mode RAM access
The Gestalt ID for the Macintosh LC II is 19 or 37 (depending on ROM version).
|-
 
| DRAM || 4 MB standard, expandable to 10 MB (100 ns or faster SIMMs)
'''Note:''' Although the 68030 supports an FPU, Apple did not include an FPU socket on the LC II logic board as a cost-saving measure.
|-
 
| ROM || 512K
== Memory and Storage ==
|-
 
| VRAM || 256K VRAM SIMM, upgradable to 512K
=== RAM Configuration ===
|-
 
| Floppy drive || 1.4 MB Apple SuperDrive
The LC II shipped with 4 MB of RAM standard, expandable to 10 MB. Memory expansion uses two 30-pin SIMM slots populated in pairs with matching 100ns or faster SIMMs.
|-
 
| Hard drive || 40, 80 or 160 MB
{| class="wikitable"
|-
|+ '''RAM Configurations'''
| Serial || Two RS-232/RS-422 ports, mini DIN-8
|-
| Video || DB-15 port for built-in video
|-
|-
! Configuration !! Slot 1 !! Slot 2
| Sound || Mono input and output ports (mini phono); 8-bit input at 11 or 22 kHz; monophonic 8-bit generator feeding the same signal to both channels
|-
|-
| 4 MB || 2 MB || 2 MB
| Expansion || 96-pin processor-direct slot for 020 or 030 direct-slot cards
|-
|-
| 6 MB || 2 MB + 2 MB soldered || 2 MB
| Power || 100–240 V AC, automatically configured, 47–63 Hz; 50 W maximum, not including the monitor
|-
|-
| 10 MB || 4 MB || 4 MB + 2 MB soldered
| Size and weight || 3.0 × 12.2 × 15.0 in (7.7 × 31.0 × 38.2 cm); 8.8 lb (4.0 kg)
|}
|}


=== Video RAM ===
== Hardware ==
 
=== Differences from the LC ===
 
Apple's developer note lists the changes from the LC: a 68030 in place of the 68020; 4 MB soldered to the board where the LC has 2 MB (both reach 10 MB); no second internal floppy connector, and no support for extra internal or external floppy drives; a microphone kit without the phono adapter plug; and a slightly modified case.<ref name="dn" /> The ROM adds support for the 68030's memory management unit and virtual memory, and supports 4 MB on the board plus up to 6 MB of expansion RAM.<ref name="dn" /> Recap-a-Mac's photographed logic board is marked 820-0327, copyright 1991, "Macintosh LC II".<ref name="ram">{{cite web |url=https://recapamac.com.au/macintosh-lcii/ |title=Macintosh LC II (Performa 400) |publisher=Recap-a-Mac |access-date=2026-09-30}} Annotated photograph of logic board 820-0327, hosted here as [[:File:Mac LC II Recap Guide.jpg]]; 17 electrolytics; notes that the board was designed so an FPU could be fitted but Apple left the socket off to save cost.</ref>
 
=== Memory ===
 
The two 30-pin SIMM slots take 100 ns or faster SIMMs. EveryMac notes that the SIMMs must be installed as an equal pair.<ref name="everymac">{{cite web |url=https://everymac.com/systems/apple/mac_lc/specs/mac_lc_ii.html |title=Apple Macintosh LC II Specs |publisher=EveryMac |access-date=2026-09-30}} Model M1700; order numbers M1701LL/A, M1723LL/A, M1707LL/A, M1387LL/A and M1720LL/A (education, floppy only); SIMMs as an equal pair; Gestalt ID 19 under System 7.0.1, 37 under 7.1; battery 3.6 V lithium; System 6.0.8 or 7.0.1 to 7.6.1.</ref> With two 4 MB SIMMs the machine holds 12 MB but addresses only 10 MB; Apple documents this as a limit, not a fault.<ref name="ss-lc" />


The LC II includes 256 KB of VRAM standard, expandable to 512 KB:
=== Video ===


* 256 KB VRAM: 640×480 at 4-bit (16 colors)
The VRAM is on a SIMM. With 256 KB the LC II drives 512 × 384 in monochrome or 8-bit colour on the 12-inch RGB monitor and 640 × 480 in monochrome or 4-bit colour on the 13-inch RGB monitor. A 512 KB SIMM adds 16-bit colour on the 12-inch monitor and 8-bit colour on the 13-inch.<ref name="dn" />
* 512 KB VRAM: 640×480 at 8-bit (256 colors)


=== Storage Systems ===
=== Floating-point unit ===


Storage options included:
The LC II has no FPU and no socket for one on the logic board. The V8 gate array decodes a 68882 on an expansion card, and the FPU select signal is on the processor-direct slot.<ref name="dn" /> Recap-a-Mac notes that the board was laid out so that an FPU could be fitted and shows a board with a PLCC socket added.<ref name="ram" />
* 40 MB, 80 MB, or 160 MB internal SCSI hard drive
* 1.44 MB SuperDrive (reads/writes 400K, 800K, and 1.44 MB disks)


== Input/Output and Expansion ==
=== Expansion slot ===


=== Port Configuration ===
The 96-pin processor-direct slot is physically and electrically the same as the LC's 68020 Direct Slot, and Apple limits a card to 4 W (800 mA at +5 V). On the LC II the FC3 signal is always high, so cards are always addressed in 32-bit mode.<ref name="dn" />


* 1× Apple Desktop Bus (ADB) port
=== Battery, power supply and capacitors ===
* 1× External SCSI (DB-25)
* 1× Audio input (3.5mm stereo minijack)
* 1× Audio output (3.5mm stereo minijack)
* 2× Serial ports (Mini DIN-8)
* 1× Video output (DA-15)


=== Expansion ===
The PRAM battery is Apple part 742-0011, a lithium cell; Apple's test is to replace it below 3.0 V.<ref name="ss-lc" /> The power supply is the part shared by the whole LC family, 661-1733.<ref name="ss-lc" /> The logic board has seventeen surface-mount electrolytic capacitors.<ref name="ram" /> See [[Macintosh LC II General Maintenance]] and [[Macintosh LC II Capacitor Replacement Guide]].


The LC II features a single LC Processor Direct Slot (LC PDS), compatible with the same expansion cards as the original LC.
== Known faults and service notes ==


== General Maintenance ==
* An eight-tone error chord at startup points to the SIMMs; a four-tone chord on the LC II points to the hard disk or floppy drive, found by disconnecting each and rebooting.<ref name="ss-lc" />
* A machine that shuts down or restarts intermittently may be in thermal shutdown: check that the vents on the back and top of the case are clear; it should recover after 30 to 40 minutes.<ref name="ss-lc" />
* If the fan is replaced, it must go in logo side down; Apple warns that otherwise it may damage the computer.<ref name="ss-lc" />
* After fitting an upgrade board or top cover, check that the sound-out and sound-in plugs are in the right ports; Apple warns that the wrong port can damage the computer or the equipment.<ref name="ss-lc" />


For detailed maintenance practices including cleaning, PRAM battery management, and connector care, refer to the dedicated [[Macintosh LC II General Maintenance]] page.
Symptom tables are on [[Macintosh LC II Troubleshooting]].


== Troubleshooting ==
== Upgrades ==


A comprehensive troubleshooting guide addressing common issues with the Macintosh LC II is available on the [[Macintosh LC II Troubleshooting]] page.
Apple's service manual gives three board upgrades: the LC II upgrade kit (for an LC), the LC III upgrade, which on an LC II uses only the kit's LC III logic board, fan and top cover, and the LC 475 logic board upgrade.<ref name="ss-lc" />


== Capacitor Replacement ==
== Documentation ==


The Macintosh LC II logic board contains 17 surface-mount electrolytic capacitors that commonly fail due to age. Detailed replacement guidelines can be found on the [[Macintosh LC II Capacitor Replacement Guide]] page.
* ''Macintosh LC Series/Quadra 605'' Service Source: [[Macintosh LC Series/ Quadra 605 Service Source]]
* ''Macintosh Performa 400 Series'' Service Source: [[Macintosh Performa 400 Series Service Source]]
* ''Macintosh LC II Computer'' Developer Note: [[Macintosh LC II Developer Note]]


== Technical Details ==
<pdf width="800" height="500">File:Quadra 605.lc series.pdf</pdf>


{| class="wikitable" style="width:70%; text-align:center;"
== Related pages ==
|+ '''Macintosh LC II Technical Specifications'''
* [[Macintosh LC II General Maintenance]]
|-
* [[Macintosh LC II Troubleshooting]]
! Component !! Specification
* [[Macintosh LC II Capacitor Replacement Guide]]
|-
* [[Macintosh LC]]
| '''CPU''' || Motorola 68030 @ 16 MHz
* [[Macintosh LC III]]
|-
* [[Macintosh Performa 400]]
| '''FPU''' || None (no socket provided)
|-
| '''PMMU''' || Integrated in 68030
|-
| '''Data Bus''' || 32-bit (16-bit memory controller)
|-
| '''System Bus''' || 16 MHz
|-
| '''ROM''' || 512 KB
|-
| '''RAM''' || 4 MB (max 10 MB)
|-
| '''VRAM''' || 256 KB (max 512 KB)
|}


== References ==
== References ==
<references />
<references />


{{Navbox-AppleVintage|state=collapsed}}
[[Category:Apple Vintage Computers]]
[[Category:Apple Vintage Computers]]

Latest revision as of 16:06, 30 September 2026

Macintosh LC II
Macintosh LC II
Specifications
ManufacturerApple Computer, Inc.
TypeDesktop personal computer
Released23 March 1992
Discontinued15 March 1993
Intro priceUS$1,699 (4 MB RAM, 40 MB hard disk)
CPUMotorola 68030 at 16 MHz (15.6672 MHz), 16-bit data path
Memory4 MB on the logic board, two 30-pin SIMM slots, 10 MB usable maximum (100 ns)
Storage40, 80 or 160 MB internal SCSI hard disk
Display—
Sound8-bit mono input and output
GraphicsBuilt in (DB-15), 256 KB or 512 KB VRAM SIMM
ROM512 KB, socketed
FPU / coprocessorNone; decoding for an optional 68882 on a PDS card
Media1.4 MB Apple SuperDrive
Ports / interfaceADB, two RS-232/RS-422 serial (mini DIN-8), SCSI (DB-25), video (DB-15), sound in, sound out
Expansion96-pin processor-direct slot (4 W)
Power100–240 V AC auto-configured, 47–63 Hz, 50 W maximum
Dimensions3.0 × 12.2 × 15.0 in (7.7 × 31.0 × 38.2 cm)
Weight8.8 lb (4.0 kg)
OS / FirmwareSystem 6.0.8 or 7.0.1 to Mac OS 7.6.1
PredecessorMacintosh LC
SuccessorMacintosh LC III
Model no.M1700 (Gestalt ID 19 under System 7.0.1, 37 under 7.1)

The Macintosh LC II is a low-profile desktop Macintosh that Apple introduced on 23 March 1992 to replace the Macintosh LC. It replaces the LC's 68020 with a 68030 and doubles the memory soldered to the board to 4 MB, but keeps the LC's case, 16-bit data path, 96-pin expansion slot and 10 MB memory limit.[1][2] It was sold as the Performa 400, 405, 410 and 430 in the consumer market.[3]

History

[edit | edit source]

Apple's launch price was US$1,699 with 4 MB of RAM and a 40 MB hard disk.[3] Apple's developer note puts its performance slightly above the LC's and notes that the 68030 supports System 7's virtual memory.[1] The Performa 400 followed on 14 September 1992, the Performa 405 and 430 on 12 April 1993 and the Performa 410 on 18 October 1993.[3] Apple's service manual for the Performa 400 series lists the 405 and 410 with 80 MB drives and the 430 with 120 MB, and the 410 with a manual-insert floppy drive.[4] The LC III replaced the LC II in February 1993, and Apple sold an LC III logic board upgrade for it.[3][2]

Specifications

[edit | edit source]
Macintosh LC II specifications (Apple)[2]
Item Figure
Processor Motorola 68030 at 16 MHz, 16-bit internal data bus, burst-mode RAM access
DRAM 4 MB standard, expandable to 10 MB (100 ns or faster SIMMs)
ROM 512K
VRAM 256K VRAM SIMM, upgradable to 512K
Floppy drive 1.4 MB Apple SuperDrive
Hard drive 40, 80 or 160 MB
Serial Two RS-232/RS-422 ports, mini DIN-8
Video DB-15 port for built-in video
Sound Mono input and output ports (mini phono); 8-bit input at 11 or 22 kHz; monophonic 8-bit generator feeding the same signal to both channels
Expansion 96-pin processor-direct slot for 020 or 030 direct-slot cards
Power 100–240 V AC, automatically configured, 47–63 Hz; 50 W maximum, not including the monitor
Size and weight 3.0 × 12.2 × 15.0 in (7.7 × 31.0 × 38.2 cm); 8.8 lb (4.0 kg)

Hardware

[edit | edit source]

Differences from the LC

[edit | edit source]

Apple's developer note lists the changes from the LC: a 68030 in place of the 68020; 4 MB soldered to the board where the LC has 2 MB (both reach 10 MB); no second internal floppy connector, and no support for extra internal or external floppy drives; a microphone kit without the phono adapter plug; and a slightly modified case.[1] The ROM adds support for the 68030's memory management unit and virtual memory, and supports 4 MB on the board plus up to 6 MB of expansion RAM.[1] Recap-a-Mac's photographed logic board is marked 820-0327, copyright 1991, "Macintosh LC II".[5]

Memory

[edit | edit source]

The two 30-pin SIMM slots take 100 ns or faster SIMMs. EveryMac notes that the SIMMs must be installed as an equal pair.[6] With two 4 MB SIMMs the machine holds 12 MB but addresses only 10 MB; Apple documents this as a limit, not a fault.[2]

Video

[edit | edit source]

The VRAM is on a SIMM. With 256 KB the LC II drives 512 × 384 in monochrome or 8-bit colour on the 12-inch RGB monitor and 640 × 480 in monochrome or 4-bit colour on the 13-inch RGB monitor. A 512 KB SIMM adds 16-bit colour on the 12-inch monitor and 8-bit colour on the 13-inch.[1]

Floating-point unit

[edit | edit source]

The LC II has no FPU and no socket for one on the logic board. The V8 gate array decodes a 68882 on an expansion card, and the FPU select signal is on the processor-direct slot.[1] Recap-a-Mac notes that the board was laid out so that an FPU could be fitted and shows a board with a PLCC socket added.[5]

Expansion slot

[edit | edit source]

The 96-pin processor-direct slot is physically and electrically the same as the LC's 68020 Direct Slot, and Apple limits a card to 4 W (800 mA at +5 V). On the LC II the FC3 signal is always high, so cards are always addressed in 32-bit mode.[1]

Battery, power supply and capacitors

[edit | edit source]

The PRAM battery is Apple part 742-0011, a lithium cell; Apple's test is to replace it below 3.0 V.[2] The power supply is the part shared by the whole LC family, 661-1733.[2] The logic board has seventeen surface-mount electrolytic capacitors.[5] See Macintosh LC II General Maintenance and Macintosh LC II Capacitor Replacement Guide.

Known faults and service notes

[edit | edit source]
  • An eight-tone error chord at startup points to the SIMMs; a four-tone chord on the LC II points to the hard disk or floppy drive, found by disconnecting each and rebooting.[2]
  • A machine that shuts down or restarts intermittently may be in thermal shutdown: check that the vents on the back and top of the case are clear; it should recover after 30 to 40 minutes.[2]
  • If the fan is replaced, it must go in logo side down; Apple warns that otherwise it may damage the computer.[2]
  • After fitting an upgrade board or top cover, check that the sound-out and sound-in plugs are in the right ports; Apple warns that the wrong port can damage the computer or the equipment.[2]

Symptom tables are on Macintosh LC II Troubleshooting.

Upgrades

[edit | edit source]

Apple's service manual gives three board upgrades: the LC II upgrade kit (for an LC), the LC III upgrade, which on an LC II uses only the kit's LC III logic board, fan and top cover, and the LC 475 logic board upgrade.[2]

Documentation

[edit | edit source]

[edit | edit source]

References

[edit | edit source]
  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Apple Computer, Macintosh LC II Computer Developer Note (1992), File:Macintosh LC II Developer Note.pdf (see Macintosh LC II Developer Note): chapter 1, pp. 2-7 (major features, design differences, compatibility issues, mathematics coprocessor); chapter 2, p. 10 (ROM changes, Gestalt ID).
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Apple Computer, Macintosh LC Series/Quadra 605 Service Source, File:Quadra 605.lc series.pdf (see Macintosh LC Series/ Quadra 605 Service Source): Specifications, PDF pp. 6-17; symptom charts, PDF pp. 20-36; Take Apart, PDF pp. 38-63; Upgrades, PDF pp. 68-86; Battery Verification, PDF pp. 106-107; Exploded View, PDF p. 112.
  3. ↑ 3.0 3.1 3.2 3.3 Macintosh LC II, Wikipedia—link(accessed 2026-09-30) Introduced 23 March 1992 at US$1,699 (Apple press release, 23 March 1992), discontinued 15 March 1993; Performa 400 introduced 14 September 1992, Performa 405 and 430 on 12 April 1993, Performa 410 on 18 October 1993; Apple's US$599 LC III logic board upgrade (Apple press release, 9 February 1993).
  4. ↑ Apple Computer, Macintosh Performa 400 Series Service Source, File:Performa 400 series.pdf (see Macintosh Performa 400 Series Service Source), Specifications, PDF pp. 3-15; exploded view, PDF p. 78.
  5. ↑ 5.0 5.1 5.2 Macintosh LC II (Performa 400), Recap-a-Mac—link(accessed 2026-09-30) Annotated photograph of logic board 820-0327, hosted here as File:Mac LC II Recap Guide.jpg; 17 electrolytics; notes that the board was designed so an FPU could be fitted but Apple left the socket off to save cost.
  6. ↑ Apple Macintosh LC II Specs, EveryMac—link(accessed 2026-09-30) Model M1700; order numbers M1701LL/A, M1723LL/A, M1707LL/A, M1387LL/A and M1720LL/A (education, floppy only); SIMMs as an equal pair; Gestalt ID 19 under System 7.0.1, 37 under 7.1; battery 3.6 V lithium; System 6.0.8 or 7.0.1 to 7.6.1.


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