HCM Cần Bán HP 48GX, máy tính dành cho dân kỹ thuật, toán học,... Dòng máy tính cao cấp

Thảo luận trong 'Kĩ thuật số, Máy ảnh, máy quay HCM, Hà Nội' bắt đầu bởi voitoi, 2 Tháng sáu 2010.

  1. voitoi New Member

    HP 48GX, máy tính dành cho dân kỹ thuật, toán học,... Dòng máy tính cao cấp, vẽ đồ thị, có khả năng giao tiếp với PC,...

    pk: máy pin sách HD bao da zin,98%
    LH:0914356394 (huy)
    17a,Đặng Tất,q1

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    Có kèm theo bao da zin.
    Bên ngoài còn khoảng 95%.

    Thông số:


    The HP-48 series' Saturn microprocessor is an 8-bit CPU hardware-wise but acts like a 4-bit processor in that it presents nibble -based data to programs
    and uses a nibble-based addressing system. External logical data fetches are
    transparently converted to 8-bit physical fetches. The processor has a 20-bit
    address bus
    available to code but due to the presence of the high/low nibble selection
    bit, only 19 bits are available externally.

    In both the HP-48S/SX and G/GX series, the _Saturn_ CPU core is integrated as
    part of a more complex integrated circuit (IC) package. These packages have
    codenames inspired by the members of the Lewis and Clark Expedition . The codename
    of the IC is _Clarke_ in the S/SX, after William Clark , and _Yorke_ in the
    G/GX, after Clark's manservant . The previous series of Saturn-based ICs were codenamed
    _Lewis_, after Meriwether Lewis .

    **[ edit ] Common for all models**

    * CPU
    architecture: Saturn

    * Screen resolution: 131×64 pixels

    * Communication Ports: 4-pin RS-232 ( Serial
    port ) or Infrared
    port (not IrDA )

    * Data bus width: 8-bit

    * Maximum 4-bit -cell
    address width: 20 bits (leading to the address space shown next)

    * Logical address
    space : 512 kB

    * Maximum register size: 64 bit (both working and scratch registers)

    * Available expansion card ports on X models: 2

    * Expansion card pins: 40

    **[ edit ] HP-48S/SX specific**

    * CPU clock frequency: 2 MHz

    * Memory clock frequency: 2 MHz

    * CPU codename: Clarke

    * Communication Protocol(s): Serial Transfers: Kermit (protocol) ; Infrared
    Transfers: proprietary

    * On-board ROM : 256 KB

    * On-board RAM : 32 KB

    * Maximum additional memory per expansion card: 128 KB (SX only)

    * ROM versions: A, B, C, D, E, J

    **[ edit ] HP-48G/GX specific**

    * CPU clock frequency: 3.7 to 4 MHz

    * Some claim that the frequency varies according to temperature [1]

    * According to one of the engineers on the design team of the HP48G series
    (Dave Arnett), the yields for 4 MHz CPUs were essentially separated into two parts: the
    ones closest to spec, generally near 3.93-3.94 Mhz , were reserved for the expandable
    models (GX), and those just slightly under spec were used for the non-
    expandable units (G). Eventually the yields improved and the CPUs which
    clocked closer to 4 MHz
    were installed in the non-expandable units as well. The effects of (non-
    extreme) temperatures are almost negligible.[_ citation needed _]

    * Memory clock frequency: 2 MHz

    * CPU codename: Yorke

    * Communication Protocol(s): Serial Transfers: Kermit (protocol) or Xmodem ; Infrared Transfers: proprietary

    * On-board ROM: 512 kB

    * On-board RAM: 32 kB (G) or 128 kB (G /GX)

    * Maximum additional memory for expansion card port 1: 128 kB

    * Maximum additional memory for expansion card port 2: 4 MB (128 kB addressable at any given time
    via bank
    switching )

    * Other communication protocols: XModem

    * ROM versions: K, L, M, P, R

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