https://j4f.info/ 2026-04-29T12:24:20+00:00 https://j4f.info/ https://j4f.info/_media/wiki/dokuwiki.svg text/html 2023-11-03T17:51:17+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/68k-mbc?rev=1699033877&do=diff 68k-MBC Description The 68k-MBC is an easy to build 68008 CPU SBC (Single Board Computer), using only easy to find TH parts. It follows the same “concept” of the previous Z80-MBC2 and V20-MBC boards, using a PIC18F47Q10 MCU as EEPROM and “universal” I/O emulator (so a text/html 2025-03-22T16:53:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/atmega32?rev=1742662386&do=diff How to flash ATmega32 This guide is for the Z80-MBC2 and V20-MBC board. Programmer Setup A cheap and easy way to burn the Arduino bootloader is to use an USBasp programmer that is commonly available: [Array] The USBasp is also capable to give the power to the “target text/html 2023-11-03T20:32:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/spp?rev=1699043577&do=diff SPP Description The Standard Parallel Port (SPP) Adapter board allows to use the GPIO port of the 68k-MBC as a standard printer parallel port. In this way you can use a legacy parallel (Centronics) printer. To connect the SPP Adapter board to the GPIO connector of the 68k-MBC board you need a 10cm long 20 wires flat cable terminated with an IDC connector at both sides (pay attention to connect the cable in the right way on both sides, so the pin 1 on the 68k-MBC GPIO connector corresponds to… text/html 2025-03-16T19:53:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/start?rev=1742154787&do=diff Just For Fun Wiki Project List * Z80-MBC2 * V20-MBC * 68k-MBC * uTerm-S * uTerm2-S * Addon * uCom * uTerm * SPP * uHat * How to flash * ATmega32 text/html 2023-11-03T17:53:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/ucom?rev=1699034021&do=diff uCom Description uCom (micro-Com) is a RS232 adapter for the Z80-MBC2 (or V20-MBC). It has a power supply for the Z80-MBC2 (or V20-MBC) and a “transparent” serial-USB port. Details [Array] [Array] [Array] [Array] Hardware Overview The uCom board, as the uTerm VT100 board, has a “transparent” text/html 2023-11-04T19:21:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/uhat?rev=1699125687&do=diff uHAT ADD-ON BOARD Just out of curiosity I've done a little add-on board with a PSRAM (specific for the ESP32) and a microSD socket. I've called it uHat (micro Hat) as it is fitted over the uTerm2-S board using the AUX (J6) connector like an hat: [Array] text/html 2023-11-03T17:52:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/uterm-s?rev=1699033935&do=diff uTerm-S Description uTerm-S (micro-Term Stand-alone) is a legacy RS232 VT100-like terminal. It is the stand-alone version of uTerm, the terminal board for the Z80-MBC2 (or V20-MBC). uTerm-S has a VGA out and PS/2 keyboard connector, a RS232 port, a power supply and a text/html 2023-11-03T17:54:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/uterm?rev=1699034056&do=diff uTerm Description uTerm (micro-Term) is a VT100-like terminal for the Z80-MBC2 (or V20-MBC). It has a VGA out and PS/2 keyboard connector, a power supply for the Z80-MBC2 and a “transparent” serial-USB port. The video terminal is based on the text/html 2025-01-05T13:23:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/uterm2-s?rev=1736083427&do=diff uTerm2-S Description I wanted an “advanced” legacy RS232 video terminal to play with “retro stuff”, so I decided to try out the FabGL library with an ESP32 (ESP32-Wroom-32) module. Details Hardware Overview The uTerm2-S (micro Term2 Stand-alone) is an easy to build multi-emulation RS232 terminal using an text/html 2023-11-03T17:50:21+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/v20-mbc?rev=1699033821&do=diff V20-MBC An easy to build homemade single board computer with a V20HL aka uPD70108H (8088 + 8080) or 80C88 CPU. CP/M-80 and CP/M-86 supported. Description The V20-MBC is an easy to build V20HL (full static CMOS version) or 80C88 CPU SBC (Single Board Computer). It follows the same text/html 2024-09-26T06:17:29+00:00 Anonymous (anonymous@undisclosed.example.com) https://j4f.info/z80-mbc2?rev=1727331449&do=diff Z80-MBC2 Homemade 8MHz Z80 SBC, 128kB banked RAM, RTC, SD (HD emulation), Basic and Forth interpreters, CP/M 2.2 and CP/M 3, cross Assembler and C (SDCC). Description The Z80-MBC2 is an easy to build Z80 SBC (Single Board Computer). It is the “