1 files changed, 68 insertions, 0 deletions
diff --git a/pc-thing/pc.ts b/pc-thing/pc.ts
new file mode 100644
index 0000000..a007189
--- /dev/null
+++ b/pc-thing/pc.ts
@@ -0,0 +1,68 @@
+import * as lib from "./lib.ts";
+type Registers = [number, number, number, number]
+export class PC {
+    registers: Registers = new Array<number>(4).fill(0) as Registers
+    regNames: string = 'abcd'
+    halted: boolean = false
+    mem = new Array<number>(2**16).fill(0)
+    getSegment: undefined | ((segment: number) => Uint16Array) = undefined;
+    getMem(addr: number): number {
+        if (addr < 0 || addr > 2**16)
+            throw 'invalid address';
+        //TODO - memory mapping
+        return this.mem[addr];
+    }
+    setMem(addr: number, data: number) {
+        if (this.getSegment && addr == 0x7cff) {
+            const segment = this.getSegment(data)
+            for (let i = 0; i < 512; i++) {
+                this.mem[0x7d00 + i] = segment.length > i ? segment[i] : 0;
+            }
+            return;
+        }
+        if (addr >= 0x7d00 && addr <= 0x7fff && this.getSegment) {
+            return;
+        }
+        this.mem[addr] = Math.floor(data) % 2**16
+    }
+    programPointer: number = 0;
+    lib = lib
+    returnFlag = 0;
+    returnStack: number[] = []
+    // the instruction set, in no particular order :3
+    instructions: Record<number, string> = {
+        0:  'mov',
+        1:  'swp',
+        2:  'ld',
+        3:  'str',
+        4:  'add',
+        5:  'sub',
+        6:  'mul',
+        7:  'div',
+        8:  'mod',
+        9:  'shl',
+        10: 'shr',
+        11: 'cmp',
+        12: 'cmr',
+        13: 'and',
+        14: 'or',
+        15: 'xor',
+        16: 'not',
+        17: 'push',
+        18: 'pop',
+        19: 'halt',
+        20: 'sys', // extra
+        21: 'jmp',
+        22: 'jnz',
+        23: 'jz',
+        24: 'jmr',
+        25: 'ret',
+        
+        31: 'end'
+    }
+    constructor(diskSupport = false) {
+        if (diskSupport) {
+            this.mem[0x7cff] = (2**16) - 1
+        }
+    }
+}
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