Apple 12/600PS manual Controller

Controller

mAMD Am29030 25-MHz microprocessor

m8 MB of ROM (including 39 Type 1 fonts)

m12 MB of RAM (expandable to 40 MB)

m128 KB parameter SRAM

mSCSI interface for internal/external hard disk(s)

mLocalTalk interface

mHigh-speed parallel interface (IEEE P1284 ECP, bidirectional)

mEthernet interface with three protocols: EtherTalk

Novell NetWare IPX (PSERVER or RPRINTER) TCP/IP (BSD lpd)

mExternal Ethernet transceivers available for: Thin Coaxial

Twisted Pair (10Base-T)

Thick Coaxial (IEEE 802.3 AUI)

mTwo-position communication configuration switch

mAll ports/protocols simultaneously active

mColor-rendering acceleration

mData compression/decompression system

mForgery tracking system

mAdobe PostScript Level 2 (version 2014)

Theory of operation

Here is an abbreviated summary of how the printer operates:

mController sends a compressed page to the video ASIC (application-specific integrated circuit), which decompresses the page at once and sends it to the laser circuitry in the engine.

mThe laser, on a scan-line-by-scan-line basis, pulses color by color and paints each successive layer of the image on the photoconductor drum. The color order is magenta-cyan-yellow-black. Laser light hits the photoconductor on all the dots where toner should appear.

258 Appendix A