Editing Macintosh LC 575 (section)

=== 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.