vLA81 - Sinclair ZX81 ULA Replacement - NEW For Sale
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vLA81 - Sinclair ZX81 ULA Replacement - NEW
Price: US $49.99
The vLA81 is a modernplugin replacement for theSinclairZX81 ULA.
Fits within the same 40 pin DIL socket outline as the original ULA.
Narrow IC pins for easy plugin ULA replacement. In most cases the existing socket will be OK (unless, of course, the existing ULA is soldered in).
Provides the same functionality as the 2C210E Sinclair ULA.
Video level selectable between standard video (suitable for direct connection to a 75 ohm monitor input) and high sync level (suitable for the modulator input or some video mod boards).
Back porch on/off select.
Internal 32K memory support (High or Low for the different hires schemes).
Programmable user configuration gives access to:
Inverse or normal video and choice of black or white border.
50/60 Hz video standard.
Ability to map ram to the ROM space (write protect enable/disable – 32K internal ram required).
Tested with an extensive suite of ZX81 software.
Ideal for preserving the original ZX81 ULA.
Low power consumption.
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