Editing Macintosh LC 575 (section)

== Technical details ==

=== System ===

{| class="wikitable styled-table" style="width:90%;"
! Sub-system !! Specification
|-
| Processor || Motorola 68LC040, 33 MHz, built-in MMU, no FPU. Socket for an optional coprocessor<ref name="ss-520" />
|-
| Processor upgrade || Socketed; Apple's Macintosh Processor Upgrade fits a PowerPC 601 with a 256 K cache card and re-seats the customer's 68LC040 on the upgrade board<ref name="ss-520" />
|-
| ROM || 1 MB<ref name="ss-520" />
|-
| RAM || 4 MB on board, expandable to 36 MB through a single 72-pin SIMM socket<ref name="ss-520" />
|-
| PRAM || 256 bytes of clock/calendar/parameter memory<ref name="ss-520" />
|-
| VRAM || 512 K on board for 8-bit colour, expandable to 1 MB for 16-bit colour, across two VRAM SIMM slots<ref name="ss-520" />
|-
| Display || 14 in Trinitron with high-contrast glass, 13 in viewable, 0.26 mm aperture grille pitch, 640 x 480 at 70 dpi<ref name="ss-520" />
|-
| Sound || Stereo sound output port and front headphone jack; monaural sound input; records at 11 or 22 kHz, plays back at 22 kHz; two speakers; built-in electret omnidirectional microphone<ref name="ss-520" />
|-
| Storage || Manual-insert 1.4 MB SuperDrive; 3.5 in internal SCSI hard drive of 80, 160, 250 or 320 MB; internal Apple CD 300+ CD-ROM drive<ref name="ss-520" />
|-
| Expansion || One processor-direct slot taking 96-pin or 114-pin cards, plus a communications slot for 50-pin modem and Ethernet cards<ref name="ss-520" />
|-
| Gestalt ID || 92<ref name="everymac-575" />
|}

'''SIMM speed:''' Apple's LC 520/550/575 volume specifies "100 ns or faster" for the DRAM
SIMM.<ref name="ss-520" /> Third-party references commonly quote 80 ns as the requirement.<ref name="everymac-575" /> Faster is
always safe; the two figures do not agree and the discrepancy is noted here rather than resolved.

=== Memory configurations ===

The machine has 4 MB soldered and one SIMM socket, so the total is 4 MB plus whatever is in the
socket, to a maximum of 36 MB.<ref name="ss-520" /> Apple's standard configurations were 5 MB (a 1 MB
SIMM) and 8 MB (a 4 MB SIMM).<ref name="everymac-575" />

=== I/O ports ===

{| class="wikitable styled-table" style="width:90%;"
|+ From Apple's I/O Interfaces specification<ref name="ss-520" />
! Port !! Connector !! Notes
|-
| Serial x 2 || Mini-DIN-8 || RS-232 / RS-422
|-
| SCSI || DB-25 || Up to six external devices
|-
| Apple Desktop Bus || Mini-DIN-4 || Apple's specification for this family lists two ADB ports, a maximum of three ADB devices, and 500 mA maximum current draw (mouse 10 mA, keyboard 25 mA)
|-
| Sound output || 3.5 mm || Stereo; plus a stereo headphone jack on the front bezel
|-
| Sound input || 3.5 mm || Monaural
|}

=== Communications slot ===

Apple describes the communications slot simply as internal expansion for '''50-pin''' modem and Ethernet
cards, and lists it as one of the three features that distinguish the LC 575 from the LC 520 and LC
550.<ref name="ss-520" /> EveryMac records the LC 575 as the first LC-series model to carry one.<ref name="everymac-575" /> No
verified list of compatible cards and their Apple part numbers was found while this page was checked, so
none is given.

=== Electrical, physical and environmental ===

{| class="wikitable styled-table" style="width:80%;"
|+ Apple specification<ref name="ss-520" />
! Item !! Specification
|-
| Line voltage || 100–240 VAC, universal power supply
|-
| Frequency || 47–63 Hz, single phase
|-
| Maximum power || 120 W
|-
| Dimensions || 17.9 in (45.5 cm) H x 13.5 in (34.4 cm) W x 16.5 in (42.0 cm) D
|-
| Weight || 40.5 lb (18.4 kg)
|-
| Operating temperature || 50–104 °F (10–40 °C)
|-
| Storage temperature || −40 to 149 °F (−40 to 65 °C)
|-
| Relative humidity || 20–95 %, non-condensing
|-
| Altitude || 0–10,000 ft operating
|}