README
¶
GoVM 
Specification
- 16-Bit address space (from
0x0000to0xFFFF) - 8 registers
- Operation registers (AX, BX, CX, DX)
- Pointer registers (CP, SP)
- Flag registers (ZF, CF)
- Interrupt pointers (IX)
- On-Off interrupt
- Keyboard interrupt
- Stack overflow interrupt
- Big endian memory layout
- All standard operations supported
- Virtual console display (80x24 character grid, 16 colors)
Memory layout
0 - F
| Address | Description | Name |
|---|---|---|
0 |
code pointer | CP |
2 |
stack pointer | SP |
4 |
zero flag | ZF |
6 |
carry flag | CF |
8 |
register | AX |
A |
register | BX |
C |
register | CX |
E |
register | DX |
10 - FF
| Address | Description | Name |
|---|---|---|
10 |
interrupt value | IX |
12 |
ir state | IT |
14 |
ir keyboard | IK |
16 |
ir stack overflow | IS |
100 - FFF
| Address | Description | Name |
|---|---|---|
100 |
stack base | SB |
| ... | stack | - |
FFF |
stack max | - |
1000 - 1FFFF
The memory layout of this region differs from mode to mode. The graphics mode is stored in 1FFE.
The only available mode at this time is the terminal mode (80x24).
In this mode the region (1000 - 1EFF) stores character and color data.
The first byte maps the color (first half foreground, second half background). You can choose between 8 different colors.
The second byte must be a UTF-8 encoded character.
License
Copyright 2016 Lennart Espe. All rights reserved.
Use of this source code is governed by a MIT-style license that can be found in the LICENSE.md file.
Documentation
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