Differences

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--- introduction [2020/05/20 08:06] – adminz
+++ introduction [2020/05/26 16:59] (current) – jtwine
@@ Line 10: / Line 10: @@
 The original thought of the LVR was simple - just add a CPU supervisor circuit so that it will monitor the power levels and hold the CPU in reset when necessary.  This could be accomplished by soldering the supervisor directly to the CPU's pins, but I wanted something a little more elegant, and later thought to extend the functionality to other CPUs as well.
-The result is the **LVR** and the **LVR (Custom)** circuits.  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 result is the **LVR** and the **LVR (Custom)** circuits (layouts shown until PCBs arrive):
+{{ :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 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.