diff --git a/README.md b/README.md index 8196325..245b96f 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,41 @@ -# TK2K_EXTENDER +# TK2000 BUS EXTENDER +## DISCLAIMER + +Any use of this project is **under your own responsibility**. +You will be responsible of checking the correct construction and functionality of your board. +By using this project You will agree that I cannot be held responsible if it will destroy any of your devices, damage your computer, burn down your house or whatever. + +## Introduction + +This board is a bus extender for the TK2000 computer, and allows plugging in up to 3 expansion boards into it. + +Differently from what happens in the Apple II, the TK2000 does not differentiate between the expansion slots: every connector brings out the same signals, and it's up +to the boards installed in there to decode the signals appropriately and decide which memory/IO range to use. + +![Empty adapter connected to a TK2000 clone](pics/adapter_empty.jpg) + +![Adapter with two installed boards](pics/adapter_with_boards.jpg) + + +## Hardware + +The board was designed with [KiCad](https://kicad.org/) EDA. + +### Bill of Materials + +| Component | Qty | Type / Value | Notes | +| ---------------------- | --- | ------------------------------------------------------- | -------------------------------------------------------------------- | +| P2, P3, P4 | 3 | 50 pin (2x25) female edge connector, 2.54mm pitch | https://aliexpress.com/item/1005008354411366.html | +| P7 | 1 | 50 pin (2x25) pin header | Optional, debug only | +| C1 - C6 | 6 | 10uF/25V+ 1206 MLCC capacitors | | +| F1 | 1 | 1.5A 1812 fuse | | +| F2, F4 | 2 | 0.5A 1206 fuse | | +| F3 | 1 | 0.25A 1206 fuse | | + +Bridge JP1, JP2, JP3 and JP4 to connect the DMA and IRQ passthrough chains. + +### Ordering the boards + +You can order the board for this project at [PCBWay](https://www.pcbway.com/project/shareproject/TODO.html) and support me or download +the gerbers and have them printed wherever you like!!! diff --git a/pics/adapter_empty.jpg b/pics/adapter_empty.jpg new file mode 100644 index 0000000..fd75f04 Binary files /dev/null and b/pics/adapter_empty.jpg differ diff --git a/pics/adapter_with_boards.jpg b/pics/adapter_with_boards.jpg new file mode 100644 index 0000000..25d2b18 Binary files /dev/null and b/pics/adapter_with_boards.jpg differ