Differences

This shows you the differences between two versions of the page.

--- introduction [2020/05/26 21:58] – jtwine
+++ introduction [2020/05/26 21:59] (current) – jtwine
@@ Line 13: / Line 13: @@
 {{ :lvr6809layout.png?400 |}}{{ :lvrcustomlayout.png?400 |}}
-The standard LVR circuit just goes directly in-between the 6809 and the board, and the **Custom** version can be adapted to just about any 40-Pin (or smaller) CPU that uses a single ''RESET'' or ''/RESET'' line.  The **Custom** version of the circuit has space for an optional 4069 CMOS inverter which allows it to be used with active-high reset lines.
+The standard LVR circuit just goes directly in-between the 6809 and the board, and the **Custom** version can be adapted to just about any 40-Pin (or smaller) CPU that uses a single ''RESET'' or ''/RESET'' line.  The **Custom** version of the circuit has space for an optional 74LS04, 74HC04 or 4069 inverter which allows it to be used with active-high reset lines.
 Since the on-board supervisor holds the CPU in reset until after voltages have stabilized, this also allows the device to be used to implement or replace a Power-On-Reset (POR) circuit.  For example, the Custom device can be used on Midway 8080-based hardware to bypass a broken POR circuit.