Single Chip Sinclair ZX81 Spectrum Computer ATmega1284P.

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Published on ● Video Link: https://www.youtube.com/watch?v=qGBw6TDWFY0


Duration: 14:04
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The start screen appears after switching on. The type of emulation and additional options can be selected here. The selection is made using the numeric keys and is saved in the EEPROM of the microcontroller.

1 ZX81 (no UDG)
2 ZX81 (UDG)
3 ZX81 (CHR $ 128)
4 ZX80 ZX80 emulation
5 Jupiter ACE emulation
6 Spectrum mono ZX Spectrum Emulation

8 Use AVR I / O
9 Normal speed
0 Maximum speed


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==========
=. features =
==========

A normal PS2 computer keyboard is used as the input device, TVs with Scart or BAS input (B / W), VGA monitors or graphic LCDs (320x240, without controller) can be used as output devices.
Universal variant with ATMega1284P, "overclocked" to 24 / 25MHz, hardware can be used (slightly modified)
VGA / LCD / PAL / NTSC adjustable
Variants with 12 / 14.7456MHz and TV / LCD
Variant with 20MHz and VGA / LCD
Z80 and system emulation up to 15K RAM in one microcontroller
Speed ​​adjustable to "original"
#ZX81 text mode, UDG and CHR $ 128, #ZX80_emulation
#ZX_Spectrum and Jupiter ACE emulation (approx. 60% original speed)
Additional ROM on the ZX81 (not with UDG), can be updated via SD card


================
= Requirements: =
================
Atmega1284p
24Mhz Crystal Oscillator
breadBoard
USB/PS2 keyboard
(2x) 3k3 resistor
(1x) 10k resistor
(1x) 510 ohm resistor

===============
= Original video =
===============
https://youtu.be/ruzCx3drurk

=============
= Schematic =
=============
http://www.jcwolfram.de/projekte/avr/ax81b/images/ax81_neu.png
http://www.jcwolfram.de/projekte/avr/ax81b/images/neu_bas.png

==========
= ( Code ) =
==========

http://www.jcwolfram.de/downloads/files/ax81b/ax81b_138-binary.tar.gz


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Tags:
ATmega1284P
Sinclair
ZX81
emulation
Computer
Single Chip
arduino
atmega
Jupiter ACE
ZX80
microcontroller