README: BOM: Fix quantities; use 1% resistors

Fix the quantity of 470 ohm resistors, 10 kohm resistors, and 14 pin DIP sockets
Use 1% resistors to reduce the number of different parts

diff --git a/README.md b/README.md
index 7915ebd..10858e0 100644 (file)
--- a/README.md
+++ b/README.md
@@ -3,14 +3,14 @@ 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.
+It reuses the same memory paging mechanism I've implemented in Zeta SBC V2, but uses Zilog Z80 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
+  * Zilog Z80 SIO - Dual channel serial interface, used for console and for connecting to other peripheral devices
 * Bus: [RC2014](https://rc2014.co.uk/) compatible
 
 ### Jumpers, Connectors, and Switches
@@ -19,6 +19,7 @@ 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 
@@ -45,14 +46,14 @@ Pin Header         | J5 - J7   | 40x2 Pin Header, 2.54 mm Pitch, Right Angle | 1
 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)
+Resistor           | R1        | 470 ohm, axial                              | 1        | Mouser [603-MFR-25FBF52-470R](https://www.mouser.com/ProductDetail/603-MFR-25FBF52-470R) 
+Resistor           | R2 - R4   | 10 kohm, 1% tolerance, axial                | 3        | Mouser [603-MFR-25FRF5210K](https://www.mouser.com/ProductDetail/603-MFR-25FRF5210K)
+Resistor           | R5        | 29.4 kohm, 1% tolerance, axial              | 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)
+IC Socket          | U12       | 14 pin DIP                                  | 1        | 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)