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New video...CPU is adding numbers from 1 to 10 and from 1 to 22
6 days ago • 0 commentsSo, a very important step is finished...the system now is able to add numbers controlled by a program. The following video shows some details:
and in the following short the relay CPU is adding the numbers from 1 to 22 in 6 seconds:
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Finished a little module...
05/25/2024 at 11:14 • 0 commentsHere you see the module for the "MOP X" command...perform a mathematical operation (selected by some bits of the opcode) with a constant stored in the adress after the command and store the result in the accu register. This module is put into the command bus of the control board.
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Finished the 8 bit ALU board
05/23/2024 at 15:53 • 0 commentsSo, the first step to a complete 16 bit ALU is a 8 bit ALU...and I finished the 8 bit ALU board (together with a 16 bit Accu register and a 16 bit result register):
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Finished the ALU result register
05/15/2024 at 19:08 • 0 commentsSo, here you see the complete ALU result register. It is a 16 bit register. The board with the 17 black relays is the storage board, 16 relays to store the 16 bits (the relays are holding themself active when switched on), one relay to switch off VCC to clear all 16 storage relays. The two other boards are used as an input enable board from the ALU or as an output enable board to the databus...
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Finished the first part of the ALU result register
05/11/2024 at 19:41 • 0 commentsSo, the following little module is able to store a 16 bit value...and will be used as the ALU result register. Two little boards will be next, one as input enable into this register, one as output enable from this register to the data bus.
You see 17 relays for 16 bit...thats because one relay is used to switch out the 24V to clear the register, this is done by a "Clear" input signal.
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Finished the first of 3 plates...
05/06/2024 at 14:14 • 0 commentsSo, what you see here is the complete adress-module of the relay CPU...the first of three plates is now complete:
This module is able to hold a 10 bit program-counter, add +1 if necessary, read/write the program-counter to/from the databus, load a adress from the databus into a adress-register and write the program-counter or the adress-register into an adressbus-register...which is connected to the adressbus.
In the following picture you see the interface:
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Finished a new register...
05/05/2024 at 19:57 • 0 commentsThe following picture shows a new 10 bit register for the adress-module. This register holds the adress if a command wants to access the memory, for example LDA M(X),,,Load the accu with the value stored in adress X. This new register holds the adress, a multiplexer is then switching between the program counter or this new register to copy one of them to the adressbus-register. Thats the way the memory is accessed.
The register was finished in one day and is tested...so the next days I will integrate it into the adress-module.
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Tested a 8 bit ALU
05/01/2024 at 15:34 • 0 commentsSo, I connected the first 8 ALU boards to implement a 8-bit ALU and tested it. The Shift Left/Right, AND, OR and NOT commands worked perfect. And in the following two pictures you see the calculation of 0x7F + 0x21 = 0xA0 (or: 127 + 33 = 160).
The first picture shows 0x7F + 0x20 = 0x9F (1001 1111, you see the red LEDs).
The second picture shows you 0x7F + 0x21 = 0xA0 (1010 0000).
How fast the calculation realy is will be shown in a video, I plan to finish the 16 bit ALU and measure (and documend) the calculation speed of the 16 bit ALU. I need the calculation time to be able to choose a clock timing for clock 1 of the relay system.
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Finished the first 8 1-bit ALU boards
04/22/2024 at 04:36 • 0 commentsThe first 8 ALU boards are finished, during the next days I will mount them together to a 8-bit ALU and test it. Two 8-bit ALUs are then mounted together to the 16-bit ALU used in the system.
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Build and tested the first ALU bit...
04/14/2024 at 08:11 • 0 commentsSo, the first ALU board is build and tested...and it is working! Now I will start building the remaining 15 boards.