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Address Map (PC-8801)
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Memory Map
Range | Name | Function |
---|---|---|
0x8000-0x800F | Interrupt Jump Pointer Table |
0x8000-0x8001: / INT7 (RS-232C Ch1 in RS-232C BASIC) 0x8002-0x8003: INT6 (vertical blank) 0x8004-0x8005: INT5 (system clock) 0x8006-0x8007: INT4 / INT3 (user defined) 0x8008-0x8009: INT3 / INT4 (user defined) 0x800A-0x800B: INT2 / INT5 general-purpose I / O port 0x800C-0x800D: INT1 / INT1 (for floppy) 0x800E-0x800F: INT0 / INT2 (for floppy) |
0xFF39-0xFF3A | Memory Integrity Test Result | PC-8000 series machines have a program called "Monitor" which can test memory integrity. If the test fails, the results are reported here.
0x0FF39-0x0FF3A: Address of the failure (Big Endian) 0x0FF3B: data written at the moment of failure 0x0FF3C: data read at the moment of failure |
Port Writes
Port | Name | Function |
---|---|---|
0x10 | Tab key status | bit 1 set if tab key down; else clear |
0xA | Printer data | |
0x30 | ||
0x31 | PC-8001 Emulator |
Bit8 - background color Bit7 - background color Bit6 - background color Bit5 - Resolution: 320 × 200 if set, else 640 × 200 Bit4 - Screen drawing: draw if set, else do not draw Bit3 - Color: monochrome if set, else indexed color Bit2 - Memory mapping: map 0x7FFF to RAM if set, else ROM Bit1 - Expansion ROM select: map 0x6000-07FFF ROM to N80/N-BASIC if set, else to extended ROM. Set by default. |
0x34 | ||
0x35 | ||
0x52 | Background Color | Sets the background color of the screen. The color is an RGB composite.
|
0x53 | ||
0x54 | Toggle Background/Foreground color components | Toggles background and foreground color components on and off
|
0x55-0x5B | Palette Write | Writes to the palette. The index written to is the difference between the port number and 0x54.
|
0x5C-0x5F | ||
0x5F | Bank Select | Map 0x8000-0xBFFF to a page in ROM |
0xE8-0xE9 | Japanese Kanji ROM Address | 0xE8 (low)
0xE9 (high) |
0xEA-0xEB | Chinese Kanji ROM Address | 0xE8 (low)
0xF4 (high) |
0xF4-0xFB | Floppy Disk DMA (Direct Memory Access system) |
8 inch disk
5 inch disk
|