---
title: "DEC Opcodes - Reviews, Revenue and Downloads in Slovakia | Apple App Store"
description: "Dec Opcodes – DEC Architecture Reference  Before the microprocessor, there was DEC. The minicomputers built by Digital Equipment Corporation didn't just advance computing - they defined it. Unix was b"
---

# DEC Opcodes — Slovakia
> Reference for DEC computers

![DEC Opcodes App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/5a/4d/71/5a4d7134-5aa5-6e7e-229a-0086b745078a/AppIcon-0-0-1x_U007epad-0-1-sRGB-85-220.png/434x0w.png)

**Developer:** [John Kennedy](https://apptail.io/developer/john-kennedy-Fvrb)
**Category:** Education
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** com.craicdesign.DecOpcodes
**Store:** Apple App Store
**Country:** Slovakia
**Version:** 1.9 (released 2026-07-10)
**Original Release:** 2026-03-13
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/sk/app/app/id6760246055)
**AppTail Page:** [https://apptail.io/app/dec-opcodes-elsA/slovakia](https://apptail.io/app/dec-opcodes-elsA/slovakia)

## DEC Opcodes Description
Dec Opcodes – DEC Architecture Reference

Before the microprocessor, there was DEC. The minicomputers built by Digital Equipment Corporation didn't just advance computing - they defined it. Unix was born on a PDP-7. Spacewar! ran on a PDP-1. The field of Artificial Intelligence was born on the PDP-10. The VAX powered universities and research labs worldwide for a generation.

 DecOpcodes puts the complete instruction sets of these legendary machines in your pocket.

 Five iconic architectures covered: PDP-1 (1960) · PDP-8 (1965) · PDP-10 (1966) · PDP-11 (1970) · VAX (1977)

 For every instruction: 

• Full description of what the instruction does 
• Octal and hex encoding 
• Flags affected 
• Addressing modes, word count, and cycle counts 
• Assembly code examples and implementation notes

But there is a lot more than just dry opcodes: 

• Complete system specifications and register architecture 
• Historical context and cultural impact 
• Archival photographs - front panels, system cabinets, and more 
• Notable installations and the systems they powered 
• Architecture variants  and successors
• Interactive lessons on assembly language and console operations (ideal if you have an emulator)
  
Built for exploration: 

• Search across all systems instantly
• A simple assembler for PDP-1, -8 and -11 code
• Filter by instruction category 
• Sort alphabetically or by category
• Favorite instructions for quick reference

Beautifully designed: 

• System-specific accent colours 
• Five themes including Terminal green and Blinkenlights orange 
• Full Dark Mode support

From the 18-bit simplicity of the PDP-1 to the 32-bit sophistication of the VAX, DecOpcodes is a fascinating and interactive journey through the machines that made modern computing possible.

## DEC Opcodes Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e6/f3/f3/e6f3f352-c852-a185-2faa-7994272a1da2/Simulator_Screenshot_-_iPhone_17_Pro_-_2026-03-08_at_12.58.41.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/35/70/d4/3570d4a9-a491-029c-daa1-96c01d522d47/Simulator_Screenshot_-_iPhone_17_Pro_-_2026-03-08_at_12.58.54.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/37/7e/48/377e482e-5344-f606-4827-6bd4747e06b0/Simulator_Screenshot_-_iPhone_17_Pro_-_2026-03-08_at_12.58.51.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ab/40/e1/ab40e1da-127e-39ad-7840-0efeadfb1d96/Simulator_Screenshot_-_iPhone_17_Pro_-_2026-03-08_at_12.58.49.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/a0/95/1c/a0951c91-b88f-0dfb-79b5-6f8872231cf6/Simulator_Screenshot_-_iPhone_17_Pro_-_2026-03-08_at_12.59.02.png/1242x2688.png)



## DEC Opcodes In-App Purchases
| Item | Price |
|------|-------|
| Buy Me a Coffee | €0.99 |



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## DEC Opcodes Available In
- [United States](https://apptail.io/app/dec-opcodes-elsA/united-states)
- [New Zealand](https://apptail.io/app/dec-opcodes-elsA/new-zealand)
- [Slovakia](https://apptail.io/app/dec-opcodes-elsA/slovakia)

---

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