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add TommyPROM32 schematic image

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Tom Nisbet 2023-09-18 15:08:10 -04:00
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@ -61,9 +61,10 @@ planned with multiple _VPP Output_ pins and some general-purpose interconnect pi
[![TommyPROM PCB](images/TommyPROM32-27C257-erase-500.jpg)](images/TommyPROM32-27C257-erase.jpg) [![TommyPROM PCB](images/TommyPROM32-27C257-erase-500.jpg)](images/TommyPROM32-27C257-erase.jpg)
For chips that require a high voltage VPP pulse during programming, some external For chips that require a high voltage VPP pulse during programming, some external
switching circuitry will be needed to allow the Arduino to control the VPP voltage. There switching circuitry will be needed to allow the Arduino to control the VPP voltage. There
is a header connected to the unused D13 pin that can support this. See the is a header connected to the unused D13 pin that can support this. See the
[Intel 8755 version of the hardware](hardware/#intel-8755a-hardware-version) for an [Intel 8755 version of the hardware](hardware/#intel-8755a-hardware-version) for an
example of voltage switching by TommyPROM. example of voltage switching by TommyPROM.
[![TommyPROM PCB](images/TommyPROM32-sch-700.png)](images/TommyPROM32-sch.png)

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