HP Laserjet IIIP, Hewlett Packard, April 1991
Hardware Info By Guru
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The LaserJet IIIP (product# 33481A) was the Resolution Enhancement Technology version of the LaserJet IIP.
Features include...
4 Pages Per Minute.
1MB RAM as Standard. RAM expansions in 1MB or 2MB modules (maximum 2, maximum 5MB).
300DPI Resolution (8" x 7" bitmap graphic with standard RAM, 1 full-page bitmap with additional 1MB RAM)
Built in Fonts (14 Bitmapped Fonts, 8 Scalable Fonts). Many optional font carts were available.
PCL5 Printer Language (Postscript requires an additional 1MB RAM).
Serial and Parallel Interface (optional 10BaseT, JetDirect, LocalTalk)

This is the main controller board. PCB# RH6-3107 33481-80003 REV A
Main components are....
- 32MHz Oscillator
- Toshiba TMP68HC000T-16 CPU. Clock Input 16MHz [32/2]
- Samsung KM44C256 256kB x4-bit CMOS DRAM with Fast-Page Mode (x8 chips, total 1024kB DRAM)
  Specification shows RAM was expandable up to maximum 5MBytes with 2x 2MB RAM Boards.
- Toshiba TC5316200AF-F125 2MB SOP44 mask ROM
- 93C46 SOIC8 EEPROM
- National SD9212AL (PLCC84). HP Part# 1820-6339.
- HP 1TW7-0301 92171 EPG56 (QFP120). Most likely this is the Print Engine, possibly related to Canon's CX Print Engine.
- HP 1TU3-0201 92147 (PLCC28)
- 19.401MHz Crystal, connected to PLCC28 chip on pins 23 and 25.
- Some LS245 Logic Chips.
- ST TL7705 Reset Chip.
- Slot for Font Cartridge.
- Several Connectors.
