User Tools
introduction
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | |||
|
introduction [2020/05/26 16:58] jtwine |
introduction [2020/05/26 16:59] (current) jtwine |
||
|---|---|---|---|
| Line 13: | Line 13: | ||
| {{ :lvr6809layout.png?400 |}}{{ :lvrcustomlayout.png?400 |}} | {{ :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. | 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. | ||
introduction.txt ยท Last modified: 2020/05/26 16:59 by jtwine
Page Tools
