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Electronics Fun archive
Category : Altera DE1 dev. board

AGAT-7. Rev.0 summary and start of Rev.A design.

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Published on: 01/05/2013

I’m about to finalise my Rev.0 of the modern replica of the retro-computer “AGAT-7”. The next step will be Rev.A design with fixed mistakes, improvements and some new ideas. In this post I’m going to summarise the Rev.0 experience and share with you with some ideas for Rev.A. At the moment the Rev.0 computer starts[…]

Agat-7. Rev.0. Floppy-drives emulators.

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Published on: 17/08/2012

At the moment I’ve completed the schematics and I’ve started to work on PCB layout. There are going to be some changes caused by discovered mistakes or better layout. So, please, treat it as a draft on this stage. Please, let me know if you notice any mistakes. Today we will have a look at[…]

Agat-7. What has been already done.

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Published on: 08/05/2012

In this post I’m going to show what has been done in the project. First of all, an extension board for DE1, that contains a socket for 6502 CPU, was made. I used a toner transfer method to make a PCB. The board connects straight to GPIO0 header on DE1 board: CPU doesn’t require all[…]

Agat-7. Project concept.

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Published on: 11/04/2012

Lets discuss the concept of the replica of Agat-7 computer. This version is not final and can be (and most likely will be) adjusted. As usual, all your ideas are welcome! CPU. A Bulgarian 6502 clone CM630 will be used as CPU in the project. But it can be changed to any other 6502 clone[…]

Agat-7. Introduction.

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Published on: 02/04/2012

After the trial project of the “UT-88′ computer, lets start with a much more serious project. We will design and build another Soviet computer – AGAT-7. In this case the DE1 board will be used only for prototyping – the computer will be built on its own board. So, lets see what this computer was.[…]

UT-88. Using OS CP/M. Part 2/2.

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Published on: 31/03/2012

In this post we will check some programs for CP/M and learn how to load your own programs on “RAM-disk”. External command POWER is intended to work with files in a RAM and the “RAM-disk”. It allows to view files, edit them, rename or erase them, as well as to view and edit data in[…]

UT-88. Using OS CP/M. Part 1/2.

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Published on: 28/03/2012

Finally we reached the most exciting part – we will launch CP/M operation system on “UT-88”. This system was initially developed in 1975 by Gary Kildall of Digital Research, Inc. for Intel 8080 based computers. “UT-88” is based on the Soviet analog of this processor (KR580VM80A), so it was possible to adapt it for this[…]

UT-88. MONITOR-F for full configuration

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Published on: 26/03/2012

In the previous post we learned how to launch the computer in full configuration. Lets see how it works and what commands MONITOR-F has. As you remember, Monitor-F can be launched from address F800H using the command 7 F800. MONITOR-F setups stack pointer, initialise some constants and variables in memory and makes keyboard initialisation. After that[…]

UT-88. Running in full configuration.

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Published on: 25/03/2012

I hope you enjoyed to play with minimal configuration of the computer. Now lets see how it can be launched in full configuration. “UT-88” computer supposed to be build step by step, starting with minimal configuration and then adding additional blocks to extend its functionality. That’s why it is a bit complicated to use. After[…]

UT-88. How to use the minimal configuration with MONITOR-0.

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Published on: 19/03/2012

In the previous post we learned how to launch the computer in the minimal configuration. Now lets see how it works in details. MONITOR-0 which is responsible for the computer work in the minimal configuration is allocated in the ROM in the range 0000H-03FFH. To launch it we just need to reset the computer by “RESET” button (KEY[0][…]

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