Karabas-128 Revision History:

Revision A

First working revision of karabas-128. See ERRATA for bugs and issues )

Revision B

Fixed bug in incorrectly routed RGB connector (thanks to Nika that reported about this issue)
Rerouted power lines, LM8596 should be more stable
Added inductor + cap filter for AD724 to reduce digital noise
Added a trimcap to adjust AD724 frequency
Replaced TL712 tape in module with CD4069 (thanks to tank-uk)
Added 3V3 regulator to support EPM3128 CPLD
Added LED to indicate power on

Revision B1

CLK_BUS signal on ZX BUS edge connector is routed via free IC4 inverter (thanks to Ricardo Saraiva with testing and investigating the bug source)
Removed 3V3 regulator, because EPM3128 has less i/o lines than EPM7128, so - unsupported
Added diode for mode switch feature (RESET+1, RESET+2, etc - thanks goes to solegstar)