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Erick
2022-02-12 01:48:29 +01:00
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@@ -11,7 +11,7 @@ The LC-3 specifies a word size of 16 bits for its registers and uses a 16-bit ad
Instructions are 16 bits wide and have 4-bit opcodes. The instruction set defines instructions for fifteen of the sixteen possible opcodes, though some instructions have more than one mode of operation. Individual instructions' execution is regulated by a state machine implemented with a control ROM and microsequencing unit. Instructions are 16 bits wide and have 4-bit opcodes. The instruction set defines instructions for fifteen of the sixteen possible opcodes, though some instructions have more than one mode of operation. Individual instructions' execution is regulated by a state machine implemented with a control ROM and microsequencing unit.
### Hardware ### Hardware
TYVM is a very barebone VM that has: TyVM is a very barebone VM that has:
- 128kb memory - 128kb memory
- 16 opcodes - 16 opcodes
- 10 registers - 10 registers
@@ -23,7 +23,7 @@ It has 2^16(=65,536) individual memory locations
uint16_t memory[UINT16_MAX]; uint16_t memory[UINT16_MAX];
``` ```
#### Registers #### Registers
TYVM has n.10 16-bit registers. TyVM has n.10 16-bit registers.
- 8 general purpose registers - 8 general purpose registers
- 1 program counter (PC) - 1 program counter (PC)
- 1 conditional register (COND) - 1 conditional register (COND)
@@ -45,7 +45,7 @@ enum {
uint16_t registers[RG_COUNT]; uint16_t registers[RG_COUNT];
``` ```
#### Instruction set #### Instruction set
TYVM has n.16 16-bit opcodes, that instructs the machine to do some simple calculation: TyVM has n.16 16-bit opcodes, that instructs the machine to do some simple calculation:
```c ```c
enum { // [name, 8-bit value] enum { // [name, 8-bit value]
OP_BR = 0, // branch, 0000 OP_BR = 0, // branch, 0000
@@ -75,7 +75,7 @@ enum { // [name, 8-bit value]
- [50] Goto 10; - [50] Goto 10;
### Build ### Build
On file "preprocessor.c" define the OS where you want to run TYVM. Comment out the following line if you want to build for Windows, otherwise it will build for Unix: On file "preprocessor.c" define the OS where you want to run TyVM. Comment out the following line if you want to build for Windows, otherwise it will build for Unix:
``` ```
#define __UNIX #define __UNIX
``` ```
@@ -94,7 +94,7 @@ make
./tyvm <*.asm> ./tyvm <*.asm>
``` ```
Below is a hello-world program for `TYVM`, the assembled program can be found in `asm/` directory Below is a hello-world program for `TyVM`, the assembled program can be found in `asm/` directory
```shell ```shell
.ORIG x3000 .ORIG x3000
LEA R0, HENLO_WORLD LEA R0, HENLO_WORLD