Z8 Basic Single board computer Rev.03
a 100mm x 160mm circuit board is supplied, which you can assemble yourself.
All components are designed as through-hole mounting. An RS232 interface is available.
unfortunately, an error has occurred in the manufacture of the printed circuit boards.
The picture "BERT2-USB-ERROR" shows how the USB interface can be used.
Two communication interfaces can be equipped depending on each other,
RS232 or USB. Optionally, a 3V battery with the corresponding
Control to buffer the RAM memory U3 and U17 can be equipped.
4 x 8Bit - Parallel interfaces are available:
Port A - Z8 Port P2.0 bis P2.7 ( 8 Bit )
Port B - Z8 Port P3.1 bis P3.6 ( 6 Bit )
Port C - SN74LS373N 8Bit Input
Port D - SN74LS373N 8Bit Output
1 xExpansion port for own extensions with data and address bus
and control signals / DS, R / W. see Schematic.
In addition there are chip select signals for the addresses:
0x7000, 0x4000 und 0x3000 put on the expansion port.
The following variants that can be used as a Z8 microcontroller:
Z8671B1-BASIC - Z8 Microcontroller with integrated BASIC interpreter
Z86C9320PSG - Z8 Mikrocontroller ROMless to max 20MHz Clock
Z86C9116PSG - Z8 Mikrocontroller ROMless to max 16MHz Clock
Possible configurations with the corresponding microcontrollers:
Z8671B1-BASIC Mikrocontroller:
U2 - 4KB EPROM 2732 optional with additional monitor program
U3 - 2KB SRAM 6116 required for basic programs
Only one configuration possible:
U7 - 2KB SRAM 6116 optional Jumper W1/W2 auf RAM set or
U7 - 2KB EPROM 2716 Zilog Mini Assembler, Jumper W1 und W2 auf ASM set
Z86C9320PSG Mikrocontroller ROMless
U6 - 8KB EPROM 2764 with BASIC interpreter, monitor program and mini assembler
U3 - 2KB SRAM 6116 required for basic programs and asm programs
Only one configuration possible:
U7 - 2KB SRAM 6116 Jumper W1/W2 auf RAM set or
U17 - 32KB SRAM 62256 (24KB usable) optional
Z86C9116PSG Mikrocontroller ROMless
U6 - 8KB EPROM 2764 with BASIC interpreter, monitor program and mini assembler
U3 - 2KB SRAM 6116 required for basic programs and asm programs
Only one configuration possible:
U7 - 2KB SRAM 6116 Jumper W1/W2 auf RAM set or
U17 - 32KB SRAM 62256 (24KB usable) optional
Kit 1 USB ( for Z86C9320 or Z86C9116PSG )
The following components are included in the kit:
1 x RAM 6116 incl. IC-Socket
1 x RAM 62256 incl. IC-Socket
1 x EPROM 2764 programmed incl. IC-Socket
1 x IC-Socket40pol. 15.24mm
2 x IC-Socket20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MCP2221A, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
USB-B socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery and microcontroller.
Kit 2 RS232 ( for Z86C9320 or Z86C9116PSG )
The following components are included in the kit:
1 x RAM 6116 incl. IC-Socket
1 x RAM 62256 incl. IC-Socket
1 x EPROM 2764 programmed incl. IC-Socket
1 x IC-Socket 40pol. 15.24mm
2 x IC-Socket 20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MAX232, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
SUB-D-9 socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery and microcontroller.
Bausatz 3 RS232 ( for Z86C9320 or Z86C9116PSG )
The following components are included in the kit:
1 x RAM IC-Socket 24pol. 15.24mm
2 x RAM IC-Socket 28pol. 15.24mm
1 x IC-Socket 40pol. 15.24mm
2 x IC-Socket 20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MAX232, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
SUB-D-9 socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery, EPROM, SRAM and microcontroller.
Kit 4 USB ( for Z86C9320 or Z86C9116PSG )
The following components are included in the kit:
1 x RAM IC-Socket 24pol. 15.24mm
2 x RAM IC-Socket 28pol. 15.24mm
1 x IC-Socket 40pol. 15.24mm
2 x IC-Socket 20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MCP2221A, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
USB-B socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery, EPROM, SRAM and microcontroller.
New basic interpreter for the Z8 with an extended range of functions.
New functions: FOR, NEXT, STEP, ABS, RND, PEEK, POKE, SIZE, WAIT, DELAY, PIN, POUT (PIN, POUT for port input and output)
Existing functions: LIST, RUN, NEW, CLEAR, LET, IF, GOTO, GOSUB, RETURN, REM, INPUT, PRINT, END, USR
BASIC programs can be loaded via the serial interface. (Instructions in the ZIP file)
All other functions are integrated. In the new ZIP there is a short description.
The basic interpreter has a memory size of 4KB.
U7 - 2KB SRAM 6116 must be equipped
U17 - 32KB SRAM 62256 (24KB usable) must be populated
The BASIC interpreter will be further developed.
It is possible to adjust the crystal frequencies in the BIN file. (see description in the ZIP file)
SHO Basic Interpreter for Z8.zip ( Beta )
SHO Basic Interpreter for Z8 V1.1.zip (Update 20.03.2021 )
Bert2-Rev03-Doku.zip ( Update 18.04.2020 )
Bert-2-Rev03.PDF ( Update 18.04.2020 )
Bert-2-Rev04.PDF ( Update 14.04.2020 - correction USB connection )
z8671_basic_debug.pdf
Z8_Assembly_Language_Programming_Manual_Dec80.pdf
All components are designed as through-hole mounting. An RS232 interface is available.
unfortunately, an error has occurred in the manufacture of the printed circuit boards.
The picture "BERT2-USB-ERROR" shows how the USB interface can be used.
RS232 or USB
Control to buffer the RAM memory U3 and U17 can be equipped.
4 x 8Bit - Parallel interfaces are available:
Port A - Z8 Port P2.0 bis P2.7 ( 8 Bit )
Port B - Z8 Port P3.1 bis P3.6 ( 6 Bit )
Port C - SN74LS373N 8Bit Input
Port D - SN74LS373N 8Bit Output
1 xExpansion port for own extensions with data and address bus
and control signals / DS, R / W. see Schematic.
In addition there are chip select signals for the addresses:
0x7000, 0x4000 und 0x3000 put on the expansion port.
The following variants that can be used as a Z8 microcontroller:
Z8671B1-BASIC - Z8 Microcontroller with integrated BASIC interpreter
Z86C9320PSG - Z8 Mikrocontroller ROMless to max 20MHz Clock
Z86C9116PSG - Z8 Mikrocontroller ROMless to max 16MHz Clock
Possible configurations with the corresponding microcontrollers:
Z8671B1-BASIC Mikrocontroller:
U2 - 4KB EPROM 2732 optional with additional monitor program
U3 - 2KB SRAM 6116 required for basic programs
Only one configuration possible:
U7 - 2KB SRAM 6116 optional Jumper W1/W2 auf RAM set or
U7 - 2KB EPROM 2716 Zilog Mini Assembler, Jumper W1 und W2 auf ASM set
Z86C9320PSG Mikrocontroller ROMless
U6 - 8KB EPROM 2764 with BASIC interpreter, monitor program and mini assembler
U3 - 2KB SRAM 6116 required for basic programs and asm programs
Only one configuration possible:
U7 - 2KB SRAM 6116 Jumper W1/W2 auf RAM set or
U17 - 32KB SRAM 62256 (24KB usable) optional
Z86C9116PSG Mikrocontroller ROMless
U6 - 8KB EPROM 2764 with BASIC interpreter, monitor program and mini assembler
U3 - 2KB SRAM 6116 required for basic programs and asm programs
Only one configuration possible:
U7 - 2KB SRAM 6116 Jumper W1/W2 auf RAM set or
U17 - 32KB SRAM 62256 (24KB usable) optional
The following components are included in the kit:
1 x RAM 6116 incl. IC-Socket
1 x RAM 62256 incl. IC-Socket
1 x EPROM 2764 programmed incl. IC-Socket
1 x IC-Socket40pol. 15.24mm
2 x IC-Socket20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MCP2221A, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
USB-B socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery and microcontroller.
The following components are included in the kit:
1 x RAM 6116 incl. IC-Socket
1 x RAM 62256 incl. IC-Socket
1 x EPROM 2764 programmed incl. IC-Socket
1 x IC-Socket 40pol. 15.24mm
2 x IC-Socket 20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MAX232, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
SUB-D-9 socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery and microcontroller.
The following components are included in the kit:
1 x RAM IC-Socket 24pol. 15.24mm
2 x RAM IC-Socket 28pol. 15.24mm
1 x IC-Socket 40pol. 15.24mm
2 x IC-Socket 20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MAX232, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
SUB-D-9 socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery, EPROM, SRAM and microcontroller.
The following components are included in the kit:
1 x RAM IC-Socket 24pol. 15.24mm
2 x RAM IC-Socket 28pol. 15.24mm
1 x IC-Socket 40pol. 15.24mm
2 x IC-Socket 20pol. 7,62mm
1 x PCB BERT-2 Rev.03
74LS373, 74LS00, 74LS368, 74LS138, 74LS21, MCP2221A, 7805
Quartz, capacitors, electrolytic capacitors, diodes, switches, 2x25pol. Socket
USB-B socket, LED, DC005, heat sink, transistors, resistors.
Delivered without battery, EPROM, SRAM and microcontroller.
New basic interpreter for the Z8 with an extended range of functions.
New functions: FOR, NEXT, STEP, ABS, RND, PEEK, POKE, SIZE, WAIT, DELAY, PIN, POUT (PIN, POUT for port input and output)
Existing functions: LIST, RUN, NEW, CLEAR, LET, IF, GOTO, GOSUB, RETURN, REM, INPUT, PRINT, END, USR
BASIC programs can be loaded via the serial interface. (Instructions in the ZIP file)
All other functions are integrated. In the new ZIP there is a short description.
The basic interpreter has a memory size of 4KB.
U7 - 2KB SRAM 6116 must be equipped
U17 - 32KB SRAM 62256 (24KB usable) must be populated
The BASIC interpreter will be further developed.
It is possible to adjust the crystal frequencies in the BIN file. (see description in the ZIP file)
SHO Basic Interpreter for Z8.zip ( Beta ) SHO Basic Interpreter for Z8 V1.1.zip (Update 20.03.2021 ) Bert2-Rev03-Doku.zip ( Update 18.04.2020 ) Bert-2-Rev03.PDF ( Update 18.04.2020 ) Bert-2-Rev04.PDF ( Update 14.04.2020 - correction USB connection ) z8671_basic_debug.pdf Z8_Assembly_Language_Programming_Manual_Dec80.pdf