board with DB9 RS232 connector

README.md

@@ -8,8 +8,7 @@ This repository contains firmware and gerber files for the Apple-1 Serial Interf
 
 This project aims to provide an alternative to the Apple Cassette Interface for the Apple-1 computer with use of the serial
 communication (9600/8-N-1). The expansion card is based around inexpensive and easily available ATMega328P MCU which operates
-as half-duplex UART. The signal levels are TTL, so adapter boards may be required if you need some other standard. The best way
+as half-duplex UART. The best way to connect the device to a regular modern PC is to use FTDI FT232RL USB dongle via exposed pin headers (5V TTL) or traditionally via standard DB9 RS232 connector.
-to connect the device to a regular modern PC is to use FTDI FT232RL USB dongle.
 
 The board tries to mimic the original ACI behaviour via the modified ACI loader program `$C100` located on the on-board ROM.
 The usual way to communicate with the device is to hook it up to a PC and use a terminal emulator program to send and
@@ -126,6 +125,7 @@ https://github.com/flowenol/Apple1ExpanderPcb
 ## PCB
 
 Gerber files can be found in the `gerber/` directory.
+The previous version of the board without DB9 connector can be found in the `gerber/noDB9` directory.
 The KiCad project files with board design and schematics can be found here:
 
 http://github.com/flowenol/Apple1SerialPcb
@@ -138,6 +138,7 @@ http://github.com/flowenol/Apple1SerialPcb
 | C1, C2  | Ceramic 22pF  | 2 |
 | C3..C9  | Ceramic 100nF | 7 |
 | C10     | Electrolytic 22uF | 1 |
+| C11..C14| Electrolytic 10uF | 4 |
 | R1, R2  | 0.68K 0.25W    | 2 |
 | R3..R9  | 1K 0.25W       | 7 |
 | XTAL1   | 16Mhz crystal HC49 low profile | 1 |
@@ -147,8 +148,10 @@ http://github.com/flowenol/Apple1SerialPcb
 | 8T97buf1,2   | 8T97N hex tristate buffers DIP16 | 2 |
 | 20V8B1  | GAL20V8 SPLD (35ns or less) DIP24 | 1 |
 | AT28C64B1 | AT28C64 ROM or similar DIP-28 | 1 |
+| MAX232 | Maxim MAX232 RS-232 driver/receiver DIP16 | 1 |
 | LED1 | LM358N double op amp DIP8 | 1 |
 | TX_LED1, RX_LED1 | LED phi 3mm | 2 |
 | L7805 | LM7805 regulator (optional) | 1 |
-| SERIAL1 | 1x3 2.54mm pin header | 1 |
+| SERIAL1 | 1x4 2.54mm pin header | 1 |
+| RS232 | DB9 horizontal female header (mounting holes offset 7.48mm) | 1 |  
 | ROM_PWR1| 1x3 2.54mm pin header (optional -  make solder blob to "5V" instead) | 1 |

gerber/Apple1Serial-B_SilkS.gbo

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gerber/Apple1Serial-Edge_Cuts.gm1

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 M02*

gerber/Apple1Serial.drl

@@ -1,7 +1,7 @@
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-; DRILL file {KiCad (5.1.5-0)} date 2021 March 10, Wednesday 11:48:31
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