Full picture
Foreword
1.
Overview
2.
Specifications
3.
Memory mapping
▸
4.
Power-on and reset circuit
▸
5.
Clock circuit
▸
6.
Zilog Z80 Processor
▸
7.
Memory Management Unit (MMU)
▸
8.
Logic Glue
▸
9.
Read-only Memory (ROM)
▸
10.
Random-Access Memory (RAM)
▸
11.
Parallel I/O: Zilog Z80 PIO
▸
12.
Universal Asynchronous Receiver Transmitter (UART)
▸
13.
Inter-Integrated Circuit (I²C)
▸
14.
I²C EEPROM
▸
15.
I²C Real-time Clock (RTC)
▸
16.
PS/2 Keyboard
▸
17.
User port
18.
Extension port
19.
Video card connector
▸
2

Specifications

The following table sums up the main features and characteristics of Zeal 8-bit Computer:
Component Description
Processor Zilog Z80 @ 10MHz
MIPS (Million Instructions Per Second) ~1.45
Primary Read-Only Memory (ROM) 256KB (NOR Flash)
upgradeable up to 512KB
Secondary Read-Only Memory (ROM) 32KB or 64KB (I²C EEPROM)
Memory (RAM) 512KB
Logical address space size 64K (16-bit)
Physical address space size 4MB (22-bit)
Keyboard interface PS/2, compatible with 104-key keyboards
Real-Time Clock ✅
Inputs/Outputs
  • User port: including I²C, UART, and GPIOs
  • Extension port
  • Video card connector
  • PS/2 port
Peripherals Game controllers, video cards, audio cards, keypads, cartridges, CompactFlash, ...
Dimensions 150mm x 100mm (5.91 in x 3.94 in)
Power input 5V through USB Type-C