From ebfee14c7a206cd043722238a4392e1d6edabcda Mon Sep 17 00:00:00 2001 From: dfnr2 Date: Fri, 15 Jan 2021 22:49:34 -0600 Subject: [PATCH] Update README.md --- hardware/apple2-encoder/README.md | 38 +++++++++++++++---------------- 1 file changed, 19 insertions(+), 19 deletions(-) diff --git a/hardware/apple2-encoder/README.md b/hardware/apple2-encoder/README.md index 8b8b945..d0546db 100644 --- a/hardware/apple2-encoder/README.md +++ b/hardware/apple2-encoder/README.md @@ -22,22 +22,25 @@ width=75%> ## Assembly Notes -1. You may build this board as if it is a general purpose ASCII interface. In +- You may build this board as if it is a general purpose ASCII interface. In that case, you may want to avoid installing the 1x25 Apple2 keyboard header - if it interferes with the target keyboard matrix. Also, for use with a key - matrix that already has a diode for each key (or each row), you will need to - install jumpers across the footprints for diodes D1-D16. + if it interferes with the target keyboard matrix. -1. If you ARE building this board as an Apple 2 encoder, then you may omit: - 1. OMIT Sol-20 connector J5 - 1. OMIT Custom connector J7 - 1. OMIT D17,D18,D19 - These are used for the "classic" keyboard matrix. - 1. OMIT D7,D8,D15,D16 - These are diodes for rows 12-15, which are not used. - 1. OMIT the serial out connector J3 if you do not plan to use a serial output. - 1. OMIT the I/O connector J4, as all the I/O lines are routed through the +- This encoder is normally used with keyboards that have a diode per key. For use +with a key matrix with no diodes (such as the Apple 2 key matrix), cut the PCB +traces that short diodes D1-16, and install D1-16. + + +- If you ARE building this board as an Apple 2 encoder, then you may OMIT: + + - Sol-20 connector J5 + - Custom connector J7 + - D17,D18,D19 - These are used for the "classic" keyboard matrix. + - D7,D8,D15,D16 - These are diodes for rows 12-15, which are not used. + - The serial out connector J3 if you do not plan to use a serial output. + - The I/O connector J4, as all the I/O lines are routed through the keyboard connector. - 1. OMIT RN1. Not needed since the microprocessor uses internal pullups. - 1. If you will be using the keyboard with only an Apple 1 or Apple 2, then + - If you will be using the keyboard with only an Apple 1 or Apple 2, then you do not need to install both the Apple 2 connector (J1) AND the Apple 1 connector (J2). You may install only the one you plan to use, and reduce the risk of plugging into the wrong socket (and possibly damaging @@ -46,12 +49,9 @@ width=75%> 1. Solder the surface-mount microcontroller first. Be sure to match pin 1 to the dot on the silk-screen layer. 1. Next, install the surface mount crystal, Y1. The orientation is not important. -1. Next, solder in the diodes D1-D7, D9-D14, and 20-D27 -1. Install all the capacitors. These are all 0.1 uF ceramic capacitors with 0.1" - lead spacing. Many capacitors with 0.2" lead spacing are actually 0.1" - emerging from the body, bent to 0.2", and can be straightened back to 0.1". -1. Next, solder in the resitor R1 and Resistor network RN1. -1. Install DIP switch SW1. +1. Next, solder in the resitor R1 +1. Install all the capacitors. Be sure to separate out the two capacitors for the XTAL + circuit from the other capacitors, the rest of which are 0.1uF bypass capacitors. 1. Install the In-circuit Serial Programming (ISP) header, J6. (right-angle, 2x3 0.100") 1. If you will be using the Apple 1 connector, install the DIP socket J1 (16-pin