Upgrading Memory of Older Models
Many older LaserJets and other HP printers (including LaserJet 4+, 4MV, 4MP, 4P, 5, 5M, 5MP, 5N, 5P, 5se, 5Si MOPIER, 5Si, 5Si NX, 6MP, 6P, 6Pse, 6Pxi, C3100A; DesignJet 330, 350C, 700, 750C, 750C Plus; DeskJet: 1600C, 1600CM, 1600CN; and PaintJet XL300) used proprietary 72-pin HP SIMMs for memory expansion. These are essentially industry-standard 72-bit SIMMs with non-standard Presence Detect (PD) connections. One can often adapt a standard 72-pin SIMM of appropriate capacity to support HP PD by soldering wires to pads, a simple task. HP printers of this type specify that RAM not faster than 70ns be used; this is probably due to a limitation of the PD decoding, and faster RAM can actually be used so long as the PD encoding indicates a speed of 70ns or slower. All printers will work with FPM (Fast Page Mode) memory; many, but not all, will work with EDO memory.
Even older models, such as the LaserJet II, IID, III, IIID, and 4/4M (i.e. not 4 Plus), used proprietary memory expansion boards. For example, the II and IID models used a roughly 4" square memory expansion board populated with DIP DRAM chips and a two-row header connector (with pins on standard 0.1" centers).
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Famous quotes containing the words memory, older and/or models:
“That you’re wavin’ from the backroads by the rivers of my memory ever smilin’
Ever gentle on my mind.”
—John Hartford (b.1937)
“... my mother ... piled up her hair and went out to teach in a one-room school, mountain children little and big alike. The first day, some fathers came along to see if she could whip their children, some who were older than she. She told the children that she did intend to whip them if they became unruly and refused to learn, and invited the fathers to stay if they liked and she’d be able to whip them too. Having been thus tried out, she was a great success with them after that.”
—Eudora Welty (b. 1909)
“... your problem is your role models were models.”
—Jane Wagner (b. 1935)