Original PC Hardware Reference

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CD: 14 Original PC Hardware Reference well as the desire to minimize power consumption, none of the RAM in the Convertible is parity checked. At the back of each system unit is an extendable bus interface. This 72-pin connector enables you to attach the following options to the base unit: a printer, a serial or parallel adapter, and a CRT display adapter. Each feature is powered from the system unit. The CRT display adapter operates only when the system is powered from a standard AC adapter. A separate CRT display or a television set attached through the CRT display adapter requires a separate AC power source. Each system unit includes a detachable LCD. When the computer is not mobile, the LCD screen can be replaced by an external monitor. When the LCD is latched in the closed position, it forms the cover for the keyboard and floppy disk drives. Because the LCD is attached with a quick-disconnect connector, you can remove it easily to place the 5140 system unit below an optional IBM 5144 PC Convertible monochrome or IBM 5145 PC Convertible color display. During the life of the Convertible, IBM offered three different LCD displays. The first display was a standard LCD, which suffered from problems with contrast and readability. Because of complaints, IBM changed the LCD to a super-twisted-type LCD display, which had much greater contrast. Finally, the third LCD display added a fluorescent backlight to the super-twisted LCD display, which not only offered greater contrast, but also made the unit usable in low-light situations. The PC Convertible system unit has these standard features: ■ Complementary Metal-Oxide Semiconductor (CMOS) 80C88 4.77 MHz microprocessor ■ Two 32KB CMOS ROMs containing these items: POST (Power-On Self Test) of system components BIOS (basic input/output system) support BASIC language interpreter ■ 256KB CMOS Static RAM (expandable to 512KB) ■ Two 3 1/2-inch, 720KB (formatted) floppy drives ■ An 80-column×25-line detachable LCD panel (graphics modes: 640×200 resolution and 320×200 resolution) ■ LCD controller ■ 16K RAM display buffer ■ 8KB LCD font RAM ■ Adapter for optional printer (#4010) ■ Professional keyboard (78 keys) ■ AC adapter ■ Battery pack The system-unit options for the 5140 are shown in this list: ■ 128KB Static RAM memory card (#4005) ■ Printer (#4010)
■ Serial/parallel adapter (#4015) ■ CRT display adapter (#4020) ■ Internal modem (#4025) ■ Printer cable (#4055) ■ Battery charger (#4060) ■ Automobile power adapter (#4065) An Introduction to the PC Convertible (5140) CD: 15 The following two optional displays were available for the PC Convertible: ■ IBM 5144 PC Convertible Monochrome Display Model 1 ■ IBM 5145 PC Convertible Color Display Model 1 PC Convertible Specifications and Highlights This section lists some technical specifications for the IBM 5140 PC Convertible system. The weights of the unit and options are listed because weight is an important consideration when you carry a laptop system. Figure 4 shows the PC Convertible motherboard components and layout. Modem connector Floppy disk drive A: connector DMA controller ROM I/O Channel RAM connector Figure 4 The PC Convertible motherboard. LCD connector Interrupt controller, keyboard controller, audio controller, system clock, and I/O controller Processor Keyboard connector Floppy disk, printer interfaces, and system timer Power connector Real-time clock Disk drive B: connector Speaker connector LCD controller LCD controller RAM
Page 1 and 2: This is the Current C-Head at the B
Page 3 and 4: An Introduction to the PC (5150) CD
Page 5 and 6: Option adapters Figure 1 The IBM PC
Page 7 and 8: An Introduction to the PC (5150) CD
Page 9 and 10: Read-only memory { 64K to 256K read
Page 11 and 12: Expansion Slots Total adapter slots
Page 13: An Introduction to the PC Convertib
Page 17 and 18: An Introduction to the PC Convertib
Page 19 and 20: An Introduction to the XT (5160) CD
Page 25 and 26: Disk Storage An Introduction to the
Page 27 and 28: Switch Block 1 (PC and XT) Switch 5
Page 29 and 30: An Introduction to the Portable PC
Page 31 and 32: Disk Storage Internal disk and tape
Page 33 and 34: IBM also offered only three differe
Page 35 and 36: Power switch Power supply selector
Page 37 and 38: An Introduction to the AT CD: 37 Th
Page 39 and 40: An Introduction to the AT CD: 39 AT
Page 41 and 42: An Introduction to the AT CD: 41 Ty
Page 43 and 44: Table 10—Drive Types An Introduct
Page 45 and 46: Memory An Introduction to the AT CD
Page 47 and 48: Variable capacitor clock trimmer RO
Page 49 and 50: An Introduction to the XT Model 286
Page 51 and 52: ■ 1.2MB floppy drive ■ 20MB har
Page 53 and 54: Disk Storage An Introduction to the
Page 55: CMOS RAM/RTC 8259 Interrupt control

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