General Information
The EFA-Datorn (EFA-Computer) is a DIY kit published in the Swedish electronics book series "Elektronik För Alla" (Electronics for everyone) written by Lars Asplund and Berndt Andersson. The first version was called EFA-4 as it was published in part 4, an extenstion was published in part 8 called EFA-8.
This kit could be compared with an Elf kit but was more targetting 'learning'. For example it had pot meter to slow down the CPU speed (almost to a stop) to allow inspecting in detail what is going on. It also had LEDs not seen on other Elf kits like Clock, TPA, TPB, MWR and MRD as well as data and address bits.
Technical specifications
Clock: 0.0004 to 0.33 MHz
Memory: 128 Bytes RAM (2 or 8 KB for the EFA-8)
Video: None (LEDs)
Sound: None
Keyboard: Toggle switches
Screen shot
Emulated EFA-4 Front Panel
Links
Other information about the EFA-Datorn:
- Elektronik för Alla del 4 with EFA-4 info and documentation however note that all documentation is in Swedish.
Main Features EFA-Datorn Emulator
- Adjustable speed, boosting the speed of the EFA-4 or EFA-8 beyond 0.33 MHz!
- Direct EFA-4 memory access to load and save software from the PC hard disk via intel hex or binary files
- RAM extension of 2 or 8 KB