Z80 Computer Project Overview

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Project

Schematic

PA0

PA1

PA2

PA3

PA4

PA5

PA6

PA7

VCC

Using Schematic Tool.

Avoiding specific references.

Detailing connections and requirements.

Considering adding the Z8420 part.

Preparing to list components.

Preparing the components table.

Here’s what’s placed in your schematic and the current net status.

Placed components

Table

Designator	Part	Terminal Type	Pin No.	Category
VCC	Terminal	powerIn	26	Power
GND	Terminal	powerIn	11	Ground
CLK	Terminal	INPUT	25	Clock
~{CE}	Terminal	INPUT	4	Z80 control
~{IORQ}	Terminal	INPUT	36	Z80 control
~{RD}	Terminal	INPUT	35	Z80 control
~{M1}	Terminal	INPUT	37	Z80 control
C/~{D}	Terminal	INPUT	5	PIO control
B/~{A}	Terminal	INPUT	6	PIO control
~{ASTB}	Terminal	INPUT	16	Handshake (Port A)
~{BSTB}	Terminal	INPUT	17	Handshake (Port B)
ARDY	Terminal	output	18	Handshake (Port A)
BRDY	Terminal	output	21	Handshake (Port B)
~{INT}	Terminal	openCollector	23	Interrupt out
IEI	Terminal	INPUT	24	Int. daisy-chain in
IEO	Terminal	output	22	Int. daisy-chain out
D0	Terminal	bidi	19	Z80 data bus
D1	Terminal	bidi	20	Z80 data bus
D2	Terminal	bidi	1	Z80 data bus
D3	Terminal	bidi	40	Z80 data bus
D4	Terminal	bidi	39	Z80 data bus
D5	Terminal	bidi	38	Z80 data bus
D6	Terminal	bidi	3	Z80 data bus
D7	Terminal	bidi	2	Z80 data bus
PA0	Terminal	bidi	15	Port A
PA1	Terminal	bidi	14	Port A
PA2	Terminal	bidi	13	Port A
PA3	Terminal	bidi	12	Port A
PA4	Terminal	bidi	10	Port A
PA5	Terminal	bidi	9	Port A
PA6	Terminal	bidi	8	Port A
PA7	Terminal	bidi	7	Port A
PB0	Terminal	bidi	27	Port B
PB1	Terminal	bidi	28	Port B
PB2	Terminal	bidi	29	Port B
PB3	Terminal	bidi	30	Port B
PB4	Terminal	bidi	31	Port B
PB5	Terminal	bidi	32	Port B
PB6	Terminal	bidi	33	Port B
PB7	Terminal	bidi	34	Port B

Net status

No nets have been defined yet. None of the above terminals are connected to any nets in the schematic.

What key nets still need to be created/connected

Power rails: connect VCC and Ground to your board’s power system.
Z80 data bus: connect the 8-bit data bus to the CPU/system bus.
Z80 control lines: connect chip enable, I/O request, read, and clock to the Z80 control bus; include any required port/control selects.
Interrupt chain: connect interrupt output and daisy-chain in/out to your system’s interrupt chain.
Handshaking: connect ASTB/BSTB and ARDY/BRDY to your peripherals as required.
Port I/O: connect PA0–PA7 and PB0–PB7 to external devices.

Add PIO chip symbol

Define key Z80 nets

Check missing Z80 signals

16 days

Ready.

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
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Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
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Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
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875105359001
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CTL1206FYW1T
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1.1M