This card adds four independent counter/timer channels to a Z50Bus system
Designed by Stephen C Cousins in United Kingdom
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The Z80 Counter/Timer Channels (CTC) integrated circuit has four independently programmable counter/timer channels. Each channel can generate a unique mode 2 interrupt. Each channel’s input and outpu…
Read More…The Z80 Counter/Timer Channels (CTC) integrated circuit has four independently programmable counter/timer channels. Each channel can generate a unique mode 2 interrupt.
Each channel’s input and output can be connected in a variety of ways with jumpers. This includes using the Z50Bus USR pins as either input signal sources or output signal destinations. It is also possible to cascade channels to create up to a 32-bit counter timer.
The board includes flexible I/O address decoding allowing the CTC’s base address to be on any 4-byte boundary.
The card includes an oscillator making the card’s functionality independent of the main bus clock frequency, thus allowing compatibility of software across different processor speeds.
The main features of this module are:
The documentation can be found at www.smallcomputercentral.com
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David | Oct. 11, 2023
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