ZXEVO 1010 ZX-Spectrum compatible computer

Hobby computer ZX Evolution is Spectrum-compatible, but has some extension and use modern peripheries 10x10cm 2-layer PCB variant by Eugene Lozovoy UzixLS, of original project ZX Evolution project of NedoPC.

Tech specs:

• Fully compatible with ZX Evolution revC
• SD/microSD card slot
• PS/2 keyboard and mouse ports
• VGA video output
• VDAC2
• TSFM (mono output) powered by 2xYMF288
• NeoGS
• SounDrive (4-channel stereo covox)
• MIDI onboard synthesizer and output for external synthesizer
• WiFi (ZiFi)
• RTC
• Tape input via 3.5 jack
• 1xDB-9 port for Sega-compatible joysticks
• USB Type C power supply
• Board optimized for G738 and G706 cases

Changelog

Main PCB

• Rev.A – first release
• Rev.A1:
  • enlarged ACEX’s footprint
  • fixed IO led always on in baseconf – added C92 and D7
  • changed R66 from 390Ω to 2.2kΩ to reduce power led bightness
  • changed R52 and R58 from 27kΩ to 18kΩ for better VDAC2 mixing volume
  • slightly moved U18
  • some minor changes

Top PCB

• Rev.A – first release
• Rev.A1:
  • added 51Ω R1 and R3 on DAC and MP3 clock signals to fix signal integrity issues
  • changed U9 from SN74LXC8T245PWR (which is unsuitable) to 74LVC245APW
  • changed R7 from 120Ω to 1kΩ to decrease LED brightness
  • changed R26 and R29 from 8.2kΩ to 18kΩ for better NeoGS mixing volume
  • changed R23 and R31 from 22kΩ to 15kΩ for better MIDI mixing volume
  • changed R65, R66, R67 and R68 from 8.2kΩ to 3.3kΩ for better PSG mixing volume (but this makes FM a unbalancy loud unfortunatelly)
  • added R50, R51, R61, C102, C103, C104 for VS10xx MP3 decoder
  • fixed swapped left-right sound channels
  • increased cutoff for CR2032 holder

Useful software

• NedoOS (BaseConf): http://nedoos.ru/
• Wild Commander (TSConf): https://forum.tslabs.info/viewtopic.php?f=26&t=143
• ZiFi WiFi client (TSConf): http://zifi.vtrd.in/
• TSConf software library: https://prods.tslabs.info/
• Joystick configuration utility (TSConf): https://github.com/tslabs/zx-evo/tree/master/pentevo/soft/avrconf

Downolad

Downlad gerber file, rom, cpld firmware, case drawing on Github