Sinclair ZX Spectrum Pentagon 128Kb AY Kit DIY (USSR logic chips)

Description

DIY Designer for self-assembly of the popular retrocomputer ZX Spectrum Pentagon 128 (AY), includes all components (With USSR Logic Chips).
Pentagon 128 is a ZX Spectrum compatible home computer created in 1991 on the post-Soviet space of ZX Spectrum machines
Onboard there is a built-in music processor, as well as 2 connectors for a modern drive and a molex power connector. There is also a place to install a molex connector to power the computer from a modern power supply unit from a PC
The diameter of vias is reduced to 0.4 mm and hidden under the mask
Integrated AY-3-8910.
Integrated port Kempston.
Added block capacitors in SMD version on the back of the board.
The printer ROM is now unavailable, it was converted to a test ROM, while the main ROM was switched using a jumper located next to the drive connector (not included).
Rewriting resistive assembly on the processor data bus with a + 5V pin on the edge, not on the center.
Added screen for quartz 8 MHz.
Improved power bus.
Added mounting holes.
Unconnected inputs of microcircuits are pulled up to + 5V.
Added mounting field to install molex type connector for floppy disk power supply
Added pins for installing SMD tantalum capacitors on the power bus
Added pins for installing SMD components instead of pinouts
etc