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Difference between revisions of "User:Green Sprite"

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|Program counter which keeps track of the memory address for the next instruction.
 
|Program counter which keeps track of the memory address for the next instruction.
 
|}
 
|}
−
 
+
==Instructions==
 +
{|class="wikitable"
 +
|-
 +
|0x0
 +
|Halt.
 +
|-
 +
|0x1
 +
|Load memory address to A.
 +
|-
 +
|0x2
 +
|Copy A to B.
 +
|-
 +
|0x3
 +
|Copy A to C.
 +
|-
 +
|0x4
 +
|Copy A to PC if C is not 0.
 +
|-
 +
|0x5
 +
|Store A to memory address.
 +
|-
 +
|0x6
 +
|\---
 +
|-
 +
|0x7
 +
|\---
 +
|-
 +
|0x8
 +
|Add A + B. Write result to A.
 +
|-
 +
|0x9
 +
|Increment 1 to A.
 +
|-
 +
|0xA
 +
|Subtract A - B. Write result to A.
 +
|-
 +
|0xB
 +
|Decrement 1 from A.
 +
|-
 +
|0xC
 +
|Shift A left by given amount.
 +
|-
 +
|0xD
 +
|Shift A right by given amount.
 +
|-
 +
|0xE
 +
|Bitwise A and B. Write result to A.
 +
|-
 +
|0xF
 +
|Bitwise not A. Write result to A.
 +
|}
 
==Memory Cell==
 
==Memory Cell==
 
===Single bit cell===
 
===Single bit cell===

Revision as of 04:54, 6 June 2021

Dwarftel Core d1

The Dwarftel Core d1 is a dwarven computer that uses primarily toggle-based mechanical logic. It is a simple processor that can add, subtract, binary shift, perform bitwise 'and' and 'not'. The processor also has 16 bytes of memory which it can write and read to. The program is kept on the memory.

Registers

A Main register, input of arithmetic operators and where the results are written.
B Secondary register, most operations that need two inputs will use this register.
C Conditional register, involved in low-level if statements.
PC Program counter which keeps track of the memory address for the next instruction.

Instructions

0x0 Halt.
0x1 Load memory address to A.
0x2 Copy A to B.
0x3 Copy A to C.
0x4 Copy A to PC if C is not 0.
0x5 Store A to memory address.
0x6 \---
0x7 \---
0x8 Add A + B. Write result to A.
0x9 Increment 1 to A.
0xA Subtract A - B. Write result to A.
0xB Decrement 1 from A.
0xC Shift A left by given amount.
0xD Shift A right by given amount.
0xE Bitwise A and B. Write result to A.
0xF Bitwise not A. Write result to A.

Memory Cell

Single bit cell

Design for single bit memory cell found here

Byte cell

Design for byte:

O═╦╦══╦╦══╦╦══╦╗
╥☼╚╝╥☼╚╝╥☼╚╝╥☼╚╝
║O╥☼║O╥☼║O╥☼║O╥☼
╨☼║O╨☼║O╨☼║O╨☼║O
╔╗╨☼╔╗╨☼╔╗╨☼╔╗╨☼
╚╩══╩╩══╩╩══╩╩═O

The byte cell is made up of eight individual single bit memory cells. The diagram shows only the track layer, the minecart and roller/furniture layers can be derived from the diagram above and the single bit design.

Memory write

Multiple byte cells are created close together to create the actual memory. A register for writing to memory, consisting of a byte cell is created. The pressure plate in each bit of the register connects to the ☼ northern gear and the ☼ sourthern gear assembly of the respective bit of all bytes in memory. The southern gear assembly is inverted. On a layer above, power is provided to all of the gears assemblies of each byte. A binary decoder selects a byte to activate in the layer above. Writing works by letting power flow first only to the byte being written to, and then the individual bits being turned on or off. To minimize the number of linkages in the reading of memory, the pressure plate being activated corresponds to a 0, and the pressure plate being lifted (unactivated) corresponds to a 1.

Memory read

The following diagram has multiple z-levels, click the diagram and press < or > to go up and down.

                 
                 
                 
 ║☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
 ☼☼═☼═☼═☼═☼═☼═☼═☼
 ║               
 ║☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
 ☼☼═☼═☼═☼═☼═☼═☼═☼
 ║               
 ║☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
 ☼☼═☼═☼═☼═☼═☼═☼═☼
 ║               
 ║☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
 ☼☼═☼═☼═☼═☼═☼═☼═☼
 .               
 .           Z=1 
 .               
 ║☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
 ☼☼═☼═☼═☼═☼═☼═☼═☼
OO  OO  OO  OO   
^■☼ ^■☼ ^■☼ ^■☼  
╚╝║ ╚╝║ ╚╝║ ╚╝║  
  ☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
  ║ ║ ║ ║ ║ ║ ║ ║
  ║ ║ ║ ║ ║ ║ ║ ║
  ☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
  ║ ║ ║ ║ ║ ║ ║ ║
  ║ ║ ║ ║ ║ ║ ║ ║
  ☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
  ║ ║ ║ ║ ║ ║ ║ ║
  ║ ║ ║ ║ ║ ║ ║ ║
  ☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
  ║ ║ ║ ║ ║ ║ ║ ║
  .              
  .          Z=0 
  .              
  ☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼
  OO║ OO║ OO║ OO║
  ^■☼ ^■☼ ^■☼ ^■☼
  ╚╝  ╚╝  ╚╝  ╚╝ 

In the design, each row of red gear assemblies ☼ are linked to the row of pressure plates in a byte. The purple gear assemblies ☼ are normally inverted and decide which byte to read. A binary decoder selects which purple gear assembly to engage. Reading works by first letting power flow through a single purple gear assembly corresponding to one byte and then through the red gear assemblies that are engaged. The lower z level (0) carries the power to a power to signal converter.

Binary Decoder

I will be using Jong's design for a binary decoder. Binary decoders allow for memory addressing and selecting operations from an opcode.

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