PC 20-III | 302564

PC 20-III | 302564

  • Mainboard revision: 6.2B
  • CPU: Intel 8088-1 running at 4.77MHz (Standard), 7.16Mhz (Turbo), or 9.54MHz (Double)
  • Optional 8087 math co-processor
  • RAM: 640KB
  • ROM: 32KB Phoenix self-configuring BIOS Version 4.40
  • Chipset: Faraday FE2010A single chip controller IC
  • Clock: Battery-backed Real Time Clock (RTC) maintains the date and time while the system is powered off
  • Floppy Drives:
  • additional 16bit VGA card Trident TVGA9000C
  • Sound: On-board piezoelectric beeper
  • Ports:
    • 9-pin d-sub bus mouse port compatible with Commodore Amiga 1352 mouse (MOS 5720)
    • 25-pin d-sub RS-232 serial port (Western Digital WD8250-PL)
    • 25-pin d-sub 8-bit Centronics parallel port (Paradise PPC1)
    • DIN-5 IBM PC XT-compatible keyboard port
    • 9-pin d-sub RGBI/Monochrome video port
    • RCA composite video port
  • Video: Onboard Paradise PVC4
    • MDA Monochrome Text
    • Hercules Monochrome Graphics
    • CGA Color Text and Graphics
    • Plantronics Colorplus Graphics
    • Alpha132 Monochrome Text
  • 3x 8-bit ISA slots for expansion
  • 75 watt power supply
  • work performed:
    • battery removed, minimal leakage, all neutralized and cleaned
    • FDDs disassembled, cleaned and lubricated
    • whole machine completely dismantled and cleaned
    • main PCB, PSU, FDD and VGA card recapped with Rubycon brand 105° type
    • missing PSU casing screw replaced
    • original Tandon HDD (on Tandon “Business Card” controller) had main bearing stuck, jump started it mechanically and made a backup of all the data, HDD and controller replaced
    • HDD led cable soldered to HDD
    • Case HDD led replaced (someone melted the holder and cut the legs too short)
    • all six missing case screws replaced
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