Brand: SHARP
Category: Office Equipment
Document Type: Manual
Language: EN
Manual for PC-6220
Uploaded: Nov. 21, 2025, 6:55 p.m.
Manual Publish Date: 1990-06-01
Warranty Information
Warranty information is not specified in this manual.
- CPU: 80C286 operating at 6MHz, 7.16MHz, or 12MHz, selectable via software.
- Memory: 1MB standard RAM, expandable up to 3MB with optional RAM cards.
- Storage: 20MB Hard Disk Drive (HDD) standard.
- Display: Black-and-white Triple Super Twist (TST) LCD with backlight, 640x480 resolution, 16 gradations.
- Keyboard: IBM 101/102-like layout with integrated numeric keypad.
- Interfaces: Serial (RS-232C), Parallel (Centronics), PS/2 keyboard.
- Power: Built-in Ni-Cd battery, rechargeable and replaceable; AC adapter.
- Expansion: Slot for internal options (Modem, CRT adapter), 2 slots for RAM cards, Expansion connector for 3.5" FDD or Expansion Unit.
- Power Saving: Three levels of power saving (display, HDD, system timeout) configurable via SETUP.
Troubleshooting and error codes
| Test items | PORT 80h | Beep sound |
| CPU register test | 01h | None |
| RTC RAM read/write test | 02h | 1-1-3 |
| BIOS ROM check sum test | 03h | 1-1-4 |
| System timer (8254) test | 04h | 1-2-1 |
| DMAC initializing test | 05h | 1-2-2 |
| DMA page register test | 06h | 1-2-3 |
| RAM refresh test | 08h | 1-3-1 |
| First 64KB system RAM test start | 09h | None |
| First 64KB RAM plural data lines error | 0Ah | 1-1-1 |
| First 64KB RAM control logic error | 0Bh | 1-3-4 |
| First 64KB RAM address line error | 0Ch | 1-4-1 |
| First 64KB RAM parity test | 0Dh | 1-4-2 |
| First 64KB RAM data line error (BIT0) | 10h | 2-1-1 |
| First 64KB RAM data line error (BIT1) | 11h | 2-1-2 |
| First 64KB RAM data line error (BIT2) | 12h | 2-1-3 |
| First 64KB RAM data line error (BIT3) | 13h | 2-1-4 |
| First 64KB RAM data line error (BIT4) | 14h | 2-2-1 |
| First 64KB RAM data line error (BIT5) | 15h | 2-2-2 |
| First 64KB RAM data line error (BIT6) | 16h | 2-2-3 |
| First 64KB RAM data line error (BIT7) | 17h | 2-2-4 |
| First 64KB RAM data line error (BIT8) | 18h | 2-3-1 |
| First 64KB RAM data line error (BIT9) | 19h | 2-3-2 |
| First 64KB RAM data line error (BITA) | 1Ah | 2-3-3 |
| First 64KB RAM data line error (BITB) | 1Bh | 2-3-4 |
| First 64KB RAM data line error (BITC) | 1Ch | 2-4-1 |
| First 64KB RAM data line error (BITD) | 1Dh | 2-4-2 |
| First 64KB RAM data line error (BITE) | 1Eh | 2-4-3 |
| First 64KB RAM data line error (BITF) | 1Fh | 2-4-4 |
| Slave DMAC register test | 20h | 3-1-1 |
| Master DMAC register test | 21h | 3-1-2 |
| Master interrupt mask register test | 22h | 3-1-3 |
| Slave interrupt mask register test | 23h | 3-1-4 |
| Interrupt vector setting | 25h | None |
| Keyboard controller test | 27h | 3-2-4 |
| RTC RAM power check sum test | 28h | None |
| RTC RAM content validation test | 29h | None |
| Display memory (VRAM) test | 2Bh | 3-3-4 |
| Display initialization test | 2Ch | 3-4-1 |
| Display line signal test | 2Dh | 3-4-2 |
| Display ROM searching | 2Eh | None |
| Display test complete | 30h | None |
| Monochrome display allowed to use | 31h | None |
| Color display (40 columns) allowed to use | 32h | None |
| Color display (80 columns) allowed to use | 33h | None |