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Epson 4S manual

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Table of contents for the manual

  • Page 1

    Epson EL 4S/33+ EL 4S/33+ Components Memory - The following diagrams illustrate the outside of the EL 4S/33+ system. dskettec#fe reeetbutton / KIB I I I CoMl cow I - VGA power inlet AC outlet MOUSE PAIGUEL Computer Specifications CPU and Memory 32-bit CPU Cyrix® or Texas Instruments® 486SLC, 33 MHz microprocessor with 16-bit data bus System spe[...]

  • Page 2

    Epson EL 4S/33+ Keyboard Mouse Game port Option slots Speaker Mass storage Diskette drives Hard disk drives Other devices Keyboard PS/2 compatible keyboard interface built into main system board; 6-pin, mini DIN connector; Num Lock setting selectable through SETUP PS/2 compatible mouse interface built into main system board; 6-pin mini DIN connecto[...]

  • Page 3

    Epson EL 4S/33+ Major Subassemblies System Board Components 12/93 Epson EL 4S/33+ - 3[...]

  • Page 4

    Epson EL 4S/33+ System board components and connectors Jumper Settings Use J10 with the built-in VGA adapter only. When J10 is ON, 1024 x 768 mode is interlaced and 800 x 600 mode refreshes at 56Hz. When J1O is OFF, 1024 x 768 is non-interlaced and refresh at 60Hz; 800 x 600 refreshes at 72Hz. (VG 460 x 480 refreshes at 60 Hz regardless of the J10 [...]

  • Page 5

    Epson EL 4S/33+ Hard disk drive types Video Memory The computer comes with 256KB of video memory. You can increase the video memory to 512KB or 1024KB by installing 20-pin, 70ns or 80ns, 44256 DIP (Dual Inline Package) chips. For the memory to work properly, you must install one chip in each socket. Video memory chip configuration * Standard video [...]

  • Page 6

    Epson EL 4S/33+ Drive Option Information Standard diskette drive specifications DMA Assignments Level DMA0 DMA1 DMA3 DMA6 DMA7 Assigned device Reserved (8-bit) Reserved (8-bit) FDD controller (8-bit) Reserved (8-bit) Cascade for DMA controller 1 Reserved (16-bit) Reserved (16-bit) Reserved (16-bit) Hardware Interrupts IRQ no. Function lRQ0 Timer ou[...]

  • Page 7

    Epson EL 4S/33+ System Memory Map System l/O Address Map 000FFFFFFh 000FF0000h 000FE0000h 00100000h 000F0000h 000C8000h 000C0000h 000A0000h System BIOS ROM: 64KB Dupliated from 0F0000h Reserved for system board: 64KB Duplicated from 0E0000h Extended memory System BlOS ROM: 64KB Default Shadow RAM duplicated at FF0000h Unused or l/O expansion ROM 16[...]

  • Page 8

    Connector Pin Assignments Parallel port connector pin assignments (CN3) *Active low logic Serial port connector pin assignments (CN4 and CN5) VGA port connector pin assignments (CN2) Power supply connector pin assignments (CN8) Diskette drive connector pin assignments (J42)* Hard disk drive connector pin assignments (J38) *Active low logic Epson EL[...]

  • Page 9

    Epson EL 4S/33+ Option card riser hard connector pin assignments (S1) (continued) *Active low logic *Active low logic SIMM sockets (RAM1, RAM2, RAM3, RAM4) Use only 30-pin, 8-bit or 9-bit, fast-page mode SIMMs (preferably tin-plated) that operate at an access speed of 70ns (nanoseconds) or faster. SIMMs must operate at the same speed. Installation/[...]

  • Page 10

    Epson EL 4S/33+ Software Problems When installing a copy-protected software package, first try the installation at high speed. If this does not work properly, select low speed by pressing the Ctrl and Alt keys and the - key on the numeric keypad simultaneously. Try loading the program at low speed and then switching to high speed, if possible. When[...]