-# easy_z80
-An easy to build Zilog Z80 based single board comptuer
+# Easy Z80
+An easy to build Zilog Z80 based single board computer
+
+## Introduction
+My son Max asked me what does it take to build a computer, and whether he can design and build one himself. This project is our attempt to design and build a simple, easy to understand, yet capable single board computer.
+It reuses the same memory paging I've implemented in Zeta SBC V2, but uses Zilog peripheral ICs to make a consistent Zilog based design.
+
+## Specifications
+* Processor: Zilog Z80 CPU (CMOS version - Z84C00)
+* Memory: 512 KiB battery-backed SRAM, 512 KiB Flash ROM
+* I/O:
+ * Zilog Z80 CTC - Programmable timer used for periodic interrupts and (optionally) for generating UART clock
+ * Zilog Z80 SIO - Dual channel serial interface, used for console and for connecting other peripherals
+* Bus: [RC2014](https://rc2014.co.uk/) compatible
+
+### Jumpers, Connectors, and Switches
+To be completed
+
+### Bill of Materials - Version 1.0
+
+[Easy Z80 project on Mouser.com](https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=f16751cb33) - View and order all components except of the PCB.
+[Easy Z80 project on OSH Park](https://oshpark.com/shared_projects/4onyIbSB) - View and order the PCB.
+
+Component type | Reference | Description | Quantity | Possible sources and notes
+------------------ | --------- | ------------------------------------------- | -------- | --------------------------
+PCB | | Easy Z80 PCB - Version 1.0 | 1 | Refer to the [RetroBrew Computers Board Inventory](https://www.retrobrewcomputers.org/doku.php?id=boardinventory#minimal_8085_z80_single_board_computer) page for ordering information, or order from a PCB manufacturer of your choice using provided Gerber or KiCad files
+Integrated Circuit | U1 | Z80 CPU, CMOS, 40 pin DIP - Z84C00xxPEG | 1 | Mouser [692-Z84C0010PEG](https://www.mouser.com/ProductDetail/692-Z84C0010PEG)
+Integrated Circuit | U2 | Z80 CTC, CMOS, 28 pin DIP - Z84C30xxPEG | 1 | Mouser [692-Z84C3010PEG](https://www.mouser.com/ProductDetail/692-Z84C3010PEG)
+Integrated Circuit | U3 | Z80 SIO/0, CMOS, 28 pin DIP - Z84C40xxPEG | 1 | Mouser [692-Z84C4010PEG](https://www.mouser.com/ProductDetail/692-Z84C4010PEG)
+Integrated Circuit | U4 | 512 KiB SRAM, 32 pin DIP - AS6C4008 | 1 | Mouser [913-AS6C4008-55PCN](https://www.mouser.com/ProductDetail/913-AS6C4008-55PCN)
+Integrated Circuit | U5 | 512 KiB Flash ROM, 32 pin DIP - SST39SF040 | 1 | Mouser [804-39SF0407CPHE](https://www.mouser.com/ProductDetail/804-39SF0407CPHE)
+Integrated Circuit | U6 | Microprocessor Supervisory Circuit - MAX693 | 1 | Mouser [584-ADM693ANZ](https://www.mouser.com/ProductDetail/584-ADM693ANZ)
+Integrated Circuit | U7, U8 | Dual RS-232 Driver/Receiver - MAX232A | 2 | Mouser [595-TRS232IN](https://www.mouser.com/ProductDetail/595-TRS232IN)
+Integrated Circuit | U9 | Simple Programmable Logic Device - ATF16V8B | 1 | Mouser [556-AF16V8B15PU](https://www.mouser.com/ProductDetail/556-AF16V8B15PU)
+Integrated Circuit | U10, U11 | 4-by-4 Register File - 74HCT670 | 2 | Mouser [595-CD74HC670E](https://www.mouser.com/ProductDetail/595-CD74HC670E)
+Integrated Circuit | U12 | Dual Flip Flop - 74HCT74 | 1 | Mouser [595-SN74HC74N](https://www.mouser.com/ProductDetail/595-SN74HC74N)
+Oscillator | QG1 | 10 MHz, CMOS oscillator, Half Can | 1 | Mouser [774-MXO45HS-3C-10.0](https://www.mouser.com/ProductDetail/774-MXO45HS-3C-10.0)
+Oscillator | QG2 | 1.8432 MHz, CMOS oscillator, Half Can | 1 | Mouser [774-MXO45HS-3C-1.8](https://www.mouser.com/ProductDetail/774-MXO45HS-3C-1.8)
+LED | D1 | 3 mm, green LED indicator | 1 | Mouser [859-LTL-4231N](https://www.mouser.com/ProductDetail/859-LTL-4231N)
+Tactile Button | SW1 | 6 mm tactile button, right angle | 1 | Mouser [653-B3F-3152](https://www.mouser.com/ProductDetail/653-B3F-3152)
+Connector | J1 | DC Power Jack, 2mm | 1 | Mouser [806-KLDX-0202-A](https://www.mouser.com/ProductDetail/806-KLDX-0202-A)
+Connector | J2, J3 | Sub-D DE9M, Right Angle, PCB mount | 2 | Mouser [806-K22X-E9P-N-99](https://www.mouser.com/ProductDetail/806-K22X-E9P-N-99)
+Connector | J4 | 2 Pin Header with Friction Lock | 1 | Mouser [571-6404562](https://www.mouser.com/ProductDetail/571-6404562)
+Pin Header | J5 - J7 | 40x2 Pin Header, 2.54 mm Pitch, Right Angle | 1 | Mouser [571-9-103326-0](https://www.mouser.com/ProductDetail/571-9-103326-0)
+Capacitor | C1 - C23 | 0.1 uF, MLCC, 5 mm Pitch | 23 | Mouser [594-K104K15X7RF53H5](https://www.mouser.com/ProductDetail/594-K104K15X7RF53H5)
+Capacitor | C24 | 47 uF, 25V, Aluminum Organic Polymer | 1 | Mouser [80-A750EK476M1EAAE40](https://www.mouser.com/ProductDetail/80-A750EK476M1EAAE40)
+Resistor Array | RR1 - RR3 | 4.7 k, bussed, 5 pin SIP | 3 | Mouser [652-4605X-AP1-472LF](https://www.mouser.com/ProductDetail/652-4605X-AP1-472LF)
+Resistor | R1 | 470 ohm, through hole | 2 | Mouser [291-470-RC](https://www.mouser.com/ProductDetail/291-470-RC) [603-MFR-25FBF52-470R](https://www.mouser.com/ProductDetail/603-MFR-25FBF52-470R)
+Resistor | R2 - R4 | 10 kohm, through hole | 1 | Mouser [291-10K-RC](https://www.mouser.com/ProductDetail/291-10K-RC) [603-MFR-25FRF5210K](https://www.mouser.com/ProductDetail/603-MFR-25FRF5210K)
+Resistor | R5 | 29.4 kohm, through hole | 1 | Mouser [603-MFR-25FBF52-29K4](https://www.mouser.com/ProductDetail/603-MFR-25FBF52-29K4)
+Trimmer Resistor | RV1 | 2 kohm, through hole | 1 | Mouser [652-3362P-1-202LF](https://www.mouser.com/ProductDetail/652-3362P-1-202LF)
+IC Socket | U1, U3 | 40 pin DIP | 2 | Mouser [517-4840-6000-CP](https://www.mouser.com/ProductDetail/517-4840-6000-CP)
+IC Socket | U4, U5 | 32 pin DIP | 2 | Mouser [517-4832-6000-CP](https://www.mouser.com/ProductDetail/517-4832-6000-CP)
+IC Socket | U2 | 28 pin DIP | 1 | Mouser [517-4828-6000-CP](https://www.mouser.com/ProductDetail/517-4828-6000-CP)
+IC Socket | U9 | 20 pin DIP | 1 | Mouser [517-4820-3000-CP](https://www.mouser.com/ProductDetail/517-4820-3000-CP)
+IC Socket | U6 - U8, U10, U11 | 16 pin DIP | 5 | Mouser [517-4816-3000-CP](https://www.mouser.com/ProductDetail/517-4816-3000-CP)
+IC Socket | U12 | 14 pin DIP | 3 | Mouser [517-4814-3000-CP](https://www.mouser.com/ProductDetail/517-4814-3000-CP)
+Oscillator Socket | QG1, QG2 | 4 pin DIP, Half Can | 2 | Mouser [535-1108800](https://www.mouser.com/ProductDetail/535-1108800)
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