Add some extra explanatory notes.

thejpster · thejpster · commit 7918a3e8df38 · 2019-12-26T22:37:28.000Z
diff --git a/audio.sch b/audio.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -264,6 +263,6 @@ Wire Wire Line
 Connection ~ 6250 3900
 Wire Wire Line
 	6350 3300 6350 4150
-Text Notes 5250 2100 0    100  ~ 20
-Audio
+Text Notes 550  7700 0    50   ~ 0
+The filter is very similar to that on a Raspberry Pi. You will need to connect some amplified speakers with their own volume control, as the\noutput is pretty weak.\n\nSet the jumper to 1-2 to send the Left Channel audio from the CPU to both the Left (Tip) and Right (Ring) outputs on the 3.5mm Jack.\n\nSet the jumper to 2-3 to send the Left Channel audio from the CPU to both the Left (Tip) output on the 3.5mm jack and the Right Channel\naudio from the CPU to the right (ring) channel on the 3.5mm Jack.\n\n
 $EndSCHEMATC
diff --git a/kbms.sch b/kbms.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -570,8 +569,6 @@ Wire Wire Line
 	5700 2800 5700 3100
 Wire Wire Line
 	5700 3100 8250 3100
-Text Notes 4450 1050 0    100  ~ 20
-Keyboard, Mouse & Joystick
 $Comp
 L Device:C C?
 U 1 1 5E043F05
@@ -651,4 +648,6 @@ Wire Wire Line
 	9550 4300 9350 4300
 Wire Wire Line
 	9350 4300 9350 3750
+Text Notes 550  7700 0    50   Italic 0
+The AtMega 328 acts as the interface to the 5V PS/2 Keyboard and PS/2 Mouse, as well as the two 9-pin Joysticks. It buffers incoming\nevents and sends the buffered data in response to commands received over the UART. It can also activate the Keyboard LEDs and\nconfigure the Mouse sample rate.\n\nBoth Atari-compatible 9-pin joysticks and SEGA MegaDrive/Genesis 9-pin controllers are supported. The latter are detected when both\nLeft and Right are active (low); the AtMega will then flip the select line and read the 'other' set of pins.\n\nThe AtMega can be programmed via the standard ISP socket. Note that activating the AtMega AT_RESET line will reset the entire board.
 $EndSCHEMATC
diff --git a/midi.sch b/midi.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -28,8 +27,8 @@ F 0 "J5" H 2600 3425 50  0000 C CNN
 F 1 "DIN-5 180 degree" H 2600 3334 50  0000 C CNN
 F 2 "JGP Footprints:5P180 DIN Socket" H 2600 3700 50  0001 C CNN
 F 3 "https://docs.rs-online.com/1ee9/0900766b81579be1.pdf" H 2600 3700 50  0001 C CNN
-F 5 "RS" H 0   0   50  0001 C CNN "Manufacturer"
-F 6 "491-087" H 0   0   50  0001 C CNN "PartNo"
+F 4 "RS" H 0   0   50  0001 C CNN "Manufacturer"
+F 5 "491-087" H 0   0   50  0001 C CNN "PartNo"
 	1    2600 3700
 	1    0    0    -1  
 $EndComp
@@ -399,8 +398,6 @@ Wire Wire Line
 	2800 2150 2600 2150
 Wire Wire Line
 	2600 2150 2600 2400
-Text Notes 5300 1650 0    100  ~ 20
-MIDI
 Wire Wire Line
 	5550 3750 6200 3750
 $Comp
@@ -427,4 +424,6 @@ Wire Wire Line
 Connection ~ 5100 5050
 Wire Wire Line
 	5100 5050 4200 5050
+Text Notes 550  7700 0    50   ~ 0
+Provides two MIDI (Musical Instrument Digital Interface) ports. These function like a UART at a fixed 31,250 bps. One port is for MIDI In\nand the other is for MIDI Out. The MIDI standard requires the input is opto-isolated, so we use the 6N138. The Hex-Schmitt inverter is\nused as a level shifter and buffer.
 $EndSCHEMATC
diff --git a/neotron-32-cache.lib b/neotron-32-cache.lib
@@ -8,9 +8,9 @@ F0 "U" 0 50 50 H V C CNN
 F1 "74xx_74LS14" 0 -50 50 H V C CNN
 F2 "" 0 0 50 H I C CNN
 F3 "" 0 0 50 H I C CNN
-ALIAS 74HC14 74HC04 74LS14
+ALIAS 74LS14
 $FPLIST
- DIP?14*
+ DIP*W7.62mm*
 $ENDFPLIST
 DRAW
 S -200 300 200 -300 7 1 10 f
@@ -20,6 +20,18 @@ P 4 3 0 10 -150 150 -150 -150 150 0 -150 150 f
 P 4 4 0 10 -150 150 -150 -150 150 0 -150 150 f
 P 4 5 0 10 -150 150 -150 -150 150 0 -150 150 f
 P 4 6 0 10 -150 150 -150 -150 150 0 -150 150 f
+P 3 1 1 0 -75 -50 -75 50 -25 50 N
+P 4 1 1 0 -100 -50 -25 -50 -25 50 0 50 N
+P 3 2 1 0 -75 -50 -75 50 -25 50 N
+P 4 2 1 0 -100 -50 -25 -50 -25 50 0 50 N
+P 3 3 1 0 -75 -50 -75 50 -25 50 N
+P 4 3 1 0 -100 -50 -25 -50 -25 50 0 50 N
+P 3 4 1 0 -75 -50 -75 50 -25 50 N
+P 4 4 1 0 -100 -50 -25 -50 -25 50 0 50 N
+P 3 5 1 0 -75 -50 -75 50 -25 50 N
+P 4 5 1 0 -100 -50 -25 -50 -25 50 0 50 N
+P 3 6 1 0 -75 -50 -75 50 -25 50 N
+P 4 6 1 0 -100 -50 -25 -50 -25 50 0 50 N
 X ~ 1 -300 0 150 R 50 50 1 0 I
 X ~ 2 300 0 150 L 50 50 1 0 O I
 X ~ 3 -300 0 150 R 50 50 2 0 I
@@ -461,11 +473,8 @@ $FPLIST
  CP_*
 $ENDFPLIST
 DRAW
-S -90 20 -90 40 0 1 0 N
-S -90 20 90 20 0 1 0 N
+S -90 20 90 40 0 1 0 N
 S 90 -20 -90 -40 0 1 0 F
-S 90 40 -90 40 0 1 0 N
-S 90 40 90 20 0 1 0 N
 P 2 0 1 0 -70 90 -30 90 N
 P 2 0 1 0 -50 110 -50 70 N
 X ~ 1 0 150 110 D 50 50 1 1 P
@@ -601,7 +610,7 @@ ENDDEF
 #
 # Device_R_Network08
 #
-DEF Device_R_Network08 RN 0 0 N N 1 F N
+DEF Device_R_Network08 RN 0 0 Y N 1 F N
 F0 "RN" -500 0 50 V V C CNN
 F1 "Device_R_Network08" 400 0 50 V V C CNN
 F2 "Resistor_THT:R_Array_SIP9" 475 0 50 V I C CNN
diff --git a/neotron-32.sch b/neotron-32.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -1056,53 +1055,53 @@ ESP01 Compatible
 $Comp
 L Mechanical:MountingHole H1
 U 1 1 5DFC719B
-P 1550 6900
-F 0 "H1" H 1650 6946 50  0000 L CNN
-F 1 "MountingHole" H 1650 6855 50  0000 L CNN
-F 2 "MountingHole:MountingHole_3.2mm_M3" H 1550 6900 50  0001 C CNN
-F 3 "~" H 1550 6900 50  0001 C CNN
-F 4 "~" H 0   0   50  0001 C CNN "Manufacturer"
-F 5 "~" H 0   0   50  0001 C CNN "PartNo"
-	1    1550 6900
+P 6200 6800
+F 0 "H1" H 6300 6846 50  0000 L CNN
+F 1 "MountingHole" H 6300 6755 50  0000 L CNN
+F 2 "MountingHole:MountingHole_3.2mm_M3" H 6200 6800 50  0001 C CNN
+F 3 "~" H 6200 6800 50  0001 C CNN
+F 4 "~" H 4650 -100 50  0001 C CNN "Manufacturer"
+F 5 "~" H 4650 -100 50  0001 C CNN "PartNo"
+	1    6200 6800
 	1    0    0    -1  
 $EndComp
 $Comp
 L Mechanical:MountingHole H2
 U 1 1 5DFC7744
-P 1550 7100
-F 0 "H2" H 1650 7146 50  0000 L CNN
-F 1 "MountingHole" H 1650 7055 50  0000 L CNN
-F 2 "MountingHole:MountingHole_3.2mm_M3" H 1550 7100 50  0001 C CNN
-F 3 "~" H 1550 7100 50  0001 C CNN
-F 4 "~" H 0   0   50  0001 C CNN "Manufacturer"
-F 5 "~" H 0   0   50  0001 C CNN "PartNo"
-	1    1550 7100
+P 6200 7000
+F 0 "H2" H 6300 7046 50  0000 L CNN
+F 1 "MountingHole" H 6300 6955 50  0000 L CNN
+F 2 "MountingHole:MountingHole_3.2mm_M3" H 6200 7000 50  0001 C CNN
+F 3 "~" H 6200 7000 50  0001 C CNN
+F 4 "~" H 4650 -100 50  0001 C CNN "Manufacturer"
+F 5 "~" H 4650 -100 50  0001 C CNN "PartNo"
+	1    6200 7000
 	1    0    0    -1  
 $EndComp
 $Comp
 L Mechanical:MountingHole H3
 U 1 1 5DFC781B
-P 1550 7300
-F 0 "H3" H 1650 7346 50  0000 L CNN
-F 1 "MountingHole" H 1650 7255 50  0000 L CNN
-F 2 "MountingHole:MountingHole_3.2mm_M3" H 1550 7300 50  0001 C CNN
-F 3 "~" H 1550 7300 50  0001 C CNN
-F 4 "~" H 0   0   50  0001 C CNN "Manufacturer"
-F 5 "~" H 0   0   50  0001 C CNN "PartNo"
-	1    1550 7300
+P 6200 7200
+F 0 "H3" H 6300 7246 50  0000 L CNN
+F 1 "MountingHole" H 6300 7155 50  0000 L CNN
+F 2 "MountingHole:MountingHole_3.2mm_M3" H 6200 7200 50  0001 C CNN
+F 3 "~" H 6200 7200 50  0001 C CNN
+F 4 "~" H 4650 -100 50  0001 C CNN "Manufacturer"
+F 5 "~" H 4650 -100 50  0001 C CNN "PartNo"
+	1    6200 7200
 	1    0    0    -1  
 $EndComp
 $Comp
 L Mechanical:MountingHole H4
 U 1 1 5DFC799C
-P 1550 7500
-F 0 "H4" H 1650 7546 50  0000 L CNN
-F 1 "MountingHole" H 1650 7455 50  0000 L CNN
-F 2 "MountingHole:MountingHole_3.2mm_M3" H 1550 7500 50  0001 C CNN
-F 3 "~" H 1550 7500 50  0001 C CNN
-F 4 "~" H 0   0   50  0001 C CNN "Manufacturer"
-F 5 "~" H 0   0   50  0001 C CNN "PartNo"
-	1    1550 7500
+P 6200 7400
+F 0 "H4" H 6300 7446 50  0000 L CNN
+F 1 "MountingHole" H 6300 7355 50  0000 L CNN
+F 2 "MountingHole:MountingHole_3.2mm_M3" H 6200 7400 50  0001 C CNN
+F 3 "~" H 6200 7400 50  0001 C CNN
+F 4 "~" H 4650 -100 50  0001 C CNN "Manufacturer"
+F 5 "~" H 4650 -100 50  0001 C CNN "PartNo"
+	1    6200 7400
 	1    0    0    -1  
 $EndComp
 Text Label 1500 2550 0    50   ~ 0
@@ -1137,6 +1136,8 @@ Wire Wire Line
 	8250 1250 8750 1250
 Wire Wire Line
 	8250 1550 9950 1550
+Text Notes 550  7700 0    50   Italic 0
+The Neotron-32 is based around a Texas Instruments EK-TM4C123GH6 Tiva-C Launchpad board. This includes a TM4C123 microcontroller\nand a JTAG + USB Serial interface.\n\nDrill down into the sub-sheets to see more detail.
 Wire Bus Line
 	8150 2900 8150 3450
 Wire Bus Line
diff --git a/parallel.sch b/parallel.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -642,8 +641,6 @@ Text Label 4250 3300 0    50   ~ 0
 RESET
 Text Label 4250 3400 0    50   ~ 0
 ~SELPRI
-Text Notes 4850 1850 0    100  ~ 20
-Parallel Printer Port
 Wire Bus Line
 	7200 3150 7200 4550
 Wire Bus Line
@@ -652,4 +649,6 @@ Wire Bus Line
 	5700 3150 5700 4550
 Wire Bus Line
 	4800 2400 4800 4550
+Text Notes 550  7700 0    50   Italic 0
+Provides an 25-pin Parallel Port as found on an IBM PC. Implementation of SPP, EPP or ECP is down to the software on the MCU, as this is a\nbasic 3.3v SPI to GPIO convertor chip.\n\nThe strobe signal is direct from the CPU to allow it to be toggled on and off relatively quickly. The MCP23S17 can be configured to generate\ninputs to avoid the CPU busy-waiting for ACK from the remote device.\n\nIf you want a proper DB25 Parallel port, you will need a 26-way IDC ribbon to DB25 male cable. These were commonly fitted to PCs in the\n1990s as the ISA I/O expansion cards and/or motherboards of the time often didn't have room for all of the ports on the backplate. We\ndidn't fit a DB25 to this board due to similar space issues.
 $EndSCHEMATC
diff --git a/power.sch b/power.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -76,8 +75,8 @@ F 0 "F1" V 4475 3300 50  0000 C CNN
 F 1 "250mA PTC" V 4566 3300 50  0000 C CNN
 F 2 "Diode_THT:D_DO-15_P10.16mm_Horizontal" H 4750 3100 50  0001 L CNN
 F 3 "https://www.littelfuse.com/~/media/electronics/product_specifications/resettable_ptcs/littelfuse_ptc_rxef025_product_specification.pdf.pdf" H 4700 3300 50  0001 C CNN
-F 5 "Littelfuse Inc" V 4700 3300 50  0001 C CNN "Manufacturer"
-F 6 "RXEF025" V 4700 3300 50  0001 C CNN "PartNo"
+F 4 "Littelfuse Inc" V 4700 3300 50  0001 C CNN "Manufacturer"
+F 5 "RXEF025" V 4700 3300 50  0001 C CNN "PartNo"
 	1    4700 3300
 	0    1    1    0   
 $EndComp
@@ -89,8 +88,8 @@ F 0 "D2" V 5004 3679 50  0000 L CNN
 F 1 "SA5.0A" V 5095 3679 50  0000 L CNN
 F 2 "Diode_THT:D_DO-15_P12.70mm_Horizontal" H 5050 3600 50  0001 C CNN
 F 3 "https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_sa_datasheet.pdf.pdf" H 5050 3600 50  0001 C CNN
-F 5 "Littelfuse" H 5050 3600 50  0001 C CNN "Manufacturer"
-F 6 "SA5.0A" H 5050 3600 50  0001 C CNN "PartNo"
+F 4 "Littelfuse" H 5050 3600 50  0001 C CNN "Manufacturer"
+F 5 "SA5.0A" H 5050 3600 50  0001 C CNN "PartNo"
 	1    5050 3600
 	0    1    1    0   
 $EndComp
@@ -316,4 +315,6 @@ Wire Wire Line
 	8750 3700 8850 3700
 Text Notes 8000 3950 0    50   ~ 0
 330R is for current limiting
+Text Notes 550  7700 0    50   Italic 0
+Connect to a 5V USB Power Supply. The board should only use around 100 mA in operation, so almost any USB 'phone charger'\nshould work, provided you have a full-size USB B cable (rather than USB micro-B). We use the full-size B as it is easier to solder the\nconnector.\n\nWe have our own 3.3V LDO to avoid overloading the LDO on the Launchpad.\n\nTaking the RESET pin low should reset the Launchpad, the AtMega and the MCP23S17.
 $EndSCHEMATC
diff --git a/rtc.sch b/rtc.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -126,8 +125,8 @@ F 0 "Y1" V 5500 3500 50  0000 L CNN
 F 1 "32,768 Hz" V 5600 3500 50  0000 L CNN
 F 2 "Crystal:Crystal_C26-LF_D2.1mm_L6.5mm_Horizontal" H 5550 3350 50  0001 C CNN
 F 3 "http://cfd.citizen.co.jp/english/prod-tech/product/pdf/datasheet_TF/CFS-206_CFS-145_E.pdf" H 5550 3350 50  0001 C CNN
-F 5 "Citizen" H 5550 3350 50  0001 C CNN "Manufacturer"
-F 6 "CFS-20632768DZBB " H 5550 3350 50  0001 C CNN "PartNo"
+F 4 "Citizen" H 5550 3350 50  0001 C CNN "Manufacturer"
+F 5 "CFS-20632768DZBB " H 5550 3350 50  0001 C CNN "PartNo"
 	1    5550 3350
 	0    1    1    0   
 $EndComp
@@ -276,6 +275,6 @@ $EndComp
 Connection ~ 6300 3150
 Wire Wire Line
 	6300 3150 6300 3200
-Text Notes 5050 2150 0    100  ~ 20
-Real Time Clock
+Text Notes 550  7700 0    50   Italic 0
+The Real-Time Clock uses an (optional) 3V coin cell as battery backup.\n\nIt appears on the I2C bus as 7-bit address 0x6F.
 $EndSCHEMATC
diff --git a/serial.sch b/serial.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -208,8 +207,6 @@ Wire Wire Line
 	3350 2850 3350 2950
 Wire Wire Line
 	3350 3250 3350 3350
-Text Notes 5400 1850 0    100  ~ 20
-Serial
 NoConn ~ 8400 3850
 NoConn ~ 7900 4250
 NoConn ~ 8400 4250
@@ -277,4 +274,6 @@ Wire Wire Line
 	8700 4050 8700 4500
 Text Notes 8650 3900 0    50   ~ 0
 Header for IDC to DE9 Ribbon. Wired DTE.
+Text Notes 550  7700 0    50   Italic 0
+This chip is a 3.3V capable version of the MAX232 RS-232 level shifter. The port is wired DTE (i.e. as if this was an IBM PC, rather than\nas a modem). We only have a five-wire RS-232 interface, missing the Ring Input, Data Set Ready, Data Terminal Ready and Carrier Detect\npins.\n\nIf you want a proper DE9 RS-232 port, you will need a 10-way IDC ribbon to DE9 male cable. These were commonly fitted to PCs in the 1990s\nas the ISA I/O expansion cards and/or motherboards of the time often didn't have room for all of the ports on the backplate. We didn't\nfit a DE9 to this board due to similar space issues.
 $EndSCHEMATC
diff --git a/storage.sch b/storage.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -280,6 +279,6 @@ Wire Wire Line
 Connection ~ 4050 2900
 Wire Wire Line
 	4050 2900 4050 3400
-Text Notes 5400 1500 0    100  ~ 20
-SD Card Storage
+Text Notes 550  7700 0    50   Italic 0
+We use a micro-SD card for space reasons. The SD card is driven in SPI mode.
 $EndSCHEMATC
diff --git a/vga.sch b/vga.sch
@@ -1,6 +1,5 @@
 EESchema Schematic File Version 4
-LIBS:neotron-32-cache
-EELAYER 26 0
+EELAYER 30 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
@@ -24,8 +23,8 @@ F 0 "J17" H 5550 4117 50  0000 C CNN
 F 1 "DB15HD_Female" H 5550 4026 50  0000 C CNN
 F 2 "Connector_Dsub:DSUB-15-HD_Female_Horizontal_P2.29x1.98mm_EdgePinOffset3.03mm_Housed_MountingHolesOffset4.94mm" H 4600 3650 50  0001 C CNN
 F 3 "https://www.amphenol-icc.com/media/wysiwyg/files/drawing/c-cd-0012.pdf" H 4600 3650 50  0001 C CNN
-F 5 "Amphenol" H 5550 3250 50  0001 C CNN "Manufacturer"
-F 6 "ICD15S13E4GV00LF" H 5550 3250 50  0001 C CNN "PartNo"
+F 4 "Amphenol" H 5550 3250 50  0001 C CNN "Manufacturer"
+F 5 "ICD15S13E4GV00LF" H 5550 3250 50  0001 C CNN "PartNo"
 	1    5550 3250
 	1    0    0    -1  
 $EndComp
@@ -190,6 +189,6 @@ Wire Wire Line
 	6200 3950 6200 4000
 Wire Wire Line
 	5200 3650 5200 4000
-Text Notes 5500 2000 0    100  ~ 20
-VGA
+Text Notes 550  7700 0    50   Italic 0
+The VGA output is driven directly from the GPIO pins using a resistive divider. The output impedance is therefore all wrong. Best results\nare with an LCD monitor and a short VGA cable. We've also had success using a cheap VGA to HDMI adaptor connected directly to the\nVGA output port.\n\nIn case of issues, use a proper VGA buffer / cable-driver like the AD8044. It's about 8 GBP though, so we didn't bother.
 $EndSCHEMATC
