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| builderpages:plasmo:z80sbc64 [2025/01/27 11:01] – Revision from 2025-01-27 | builderpages:plasmo:z80sbc64 [2026/06/15 13:17] (current) – external edit 127.0.0.1 |
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| | /* Imported from Wayback Machine |
| | Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:z80sbc64 |
| | Snapshot date: 2025-10-15 |
| | Generator : wayback-archiver |
| | */ |
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| | ====== Z80SBC64, Hobbyist Friendly Z80 SBC ====== |
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| | ===== Introduction ===== |
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| | Z80SBC64 is a hobbyist friendly version of [[builderpages:plasmo:z80sbcrc|Z80SBCRC]]. All components are either in through-hole technology or easy-to-solder surface mount components. The board is in the standard RC2014 (100mm x 50mm) form factor. |
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| | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=25df32&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z80sbc64/dsc_40841213.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z80sbc64/dsc_40841213.jpg?600x253|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_z80sbc64_dsc_40841213.jpg}}]] |
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| | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=bbca97&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z80sbc64/dsc_40851213.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z80sbc64/dsc_40851213.jpg?600x266|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_z80sbc64_dsc_40851213.jpg}}]] |
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| | ===== Features ===== |
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| | Z80 running at 20MHz |
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| | ROMless |
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| | Battery-backed 128K RAM |
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| | Altera EPM7064S in PLCC44 package |
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| | 4 banks, each bank is 32KB |
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| | Simple serial port with serial bootstrap capability |
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| | Serial port operates at 115200 N81, no handshakes |
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| | Compact flash interface |
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| | CP/M 2.2 and CP/M 3 |
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| | 100mm x 50mm pc board |
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| | RC2014 bus interface |
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| | ===== Functions ===== |
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| | The heart of the SBC is a 5V CPLD, Altera EPM7064S, that implements the serial port receive function, generates baud clock, interfaces to compact flash, and divides memory into 4 banks of 32KB. The design has no ROM. The traditional ROM software are stored in battery-backed RAM. The serial bootstrap function loads the ROM-equivalent software into RAM when the board is powered up the first time; the system boots off the software in RAM for subsequent power cycles or resets. The ROM-equivalent software are protected by switching to banks inaccessible to normal software. |
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| | Instead of the EPM7128S, a smaller EPM7064S is used because it is available in PLCC44 package that can be socketed in a 44-pin PLCC through-hole socket. This is the design compromise to enable a hobbyist-friendly board with through-hole components and an easy-to-solder surface mount connector. Because of the limited resources on EPM7064S, the memory supported is 128KB with 4 banks of 32KB. Furthermore, the serial port transmit function is emulate in software (bit banging). |
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| | ===== Design information ===== |
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| | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=9baa6c&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z80sbc64/z80sbc64_connectors_copy.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z80sbc64/z80sbc64_connectors_copy.jpg?500x235|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_z80sbc64_z80sbc64_connectors_copy.jpg}}]] |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbc64_scm.pdf|Schematic]] |
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| | <del>Gerber [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbc64_r0.zip|photoplots]], the boards were manufacturered by Seeed Studio.</del> |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbc64_r1_single.zip|Rev 1 of Gerber photoplots]], minor corrections to rev 0. The pc boards were manufacturered by JLCPCB |
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| | Altera EPM7064SLC44 [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbc64_epm7064.zip|design file.]] The design are created as schematic in Quartus 8.1. This is a PDF file of the [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbc64_cpld_scm.pdf|schematic]] |
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| | [[builderpages:plasmo:z80mb64:memmap|Memory and I/O map]] |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:bill_of_material_z80sbc64_r0.pdf|Bill of Materials]] |
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| | ==== Software ==== |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbcld.zip|Z80SBCLD]] is the bootstrap loader. Configure Z80SBC64 to Serial Bootstrap mode and send Z80SBCLD.BIN as binary file to Z80SBC64 immediately after reset. Z80SBC64 will respond with “**Z80SBC64 Loader v0.3**” sign on message and ready to receive ZMon64 load file. Once ZMon64 is loaded, it will start program execution at 0xB400 which is the entry point of ZMon64. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:zmon64_r0_7.zip|ZMon64 rev 0.7]], improve the 'R' command, add 'c1' command to store SCMonitor in RAM and 'b1' command to execute the stored SCMonitor. Add 'c3' command to store CP/M 3 and 'b3' command to execute CP/M 3. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:scmonitor.hex|SCMonitor]] is a sophisticated monitor developed by [[https://smallcomputercentral.com/|Steve Cousins]]. It has many features, among them a version of MS BASIC that runs well on Z80SBC64. After loading the hex file, type 'g0000' to start up SCMonitor. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:scmonitor_startrek.hex|SCMonitor+StarTrek]] This version of SCMonitor already have the StarTrek program loaded in BASIC. Type 'WBASIC' in SCMonitor prompt and then 'RUN'. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:cpm22all_z80sbc64.zip|cpm22all]] is CP/M2.2 BDOS/CCP/BIOS for Z80SBC64. Use '**c2**' command to store it in CF disk and use '**b2**' command to boot into CP/M2.2. The software is assembled using Zilog ZDS v3.68. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:xmodem.hex|XMODEM]] is the file transfer program to bring in all CP/M programs from PC to Z80SBC64. While in monitor, send XMODEM.HEX as Intel Hex file, type 'b2' to boot into CP/M2.2, then type 'save 17 xmodem.com'. XMODEM.COM will be created as the first file on the CP/M disk. To invoke XMODEM to receive files, type 'xmodem filename /r/c/z1' and go to the terminal program to send file via xmodem. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zz80cf:cpm22dri.zip|CPM22DRI]] is system files for CP/M2.2. Unzip the file to CPM22DRI.ARJ then use XMODEM to transfer it to CP/M. Once transferred, use unarj.com to decompress the files. CPM22DRI image is created using cpmtools. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:cpm3ldr.hex|CPM3LDR]] is CP/M 3 loader program. Upload CPM3LDR.hex and type '**c3**' to install it in the reserved sectors in CF drive. type '**b3**' to boot CP/M 3 |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:z80sbc64_cpm3.zip|CPM3 BIOS]] for Z80MB64 and Z80SBC64. They are assembled with ZMAC. |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z80sbc64:cpm3all.zip|CPM3ALL]] is CP/M 3 distribution files. Unzip to CPM3ALL.ARJ, then xmodem to Z80SBC64 and use unarj.com to decompress into drive A: |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zz80cf:unarj.zip|unarj.com]] is the CP/M program that decompresses CPM3ALL.ARJ and CPM22DRI.ARJ above. The command is “**unarj e filename**” |
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| | ===== Instruction and Manuals ===== |
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| | [[builderpages:plasmo:z80sbc64:getting_started|Getting started]] guide |
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| | [[builderpages:plasmo:z80mb64:zmon64_manual|ZMon64]] manual |
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| | Pictorial [[builderpages:plasmo:z80sbc64:assembly_guide|assembly guide]] |
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| | Build Z80SBC64 in [[builderpages:plasmo:z80sbc64:four_stages|four stages]], building a high-performance, CP/M capable Z80 SBC in four stages |
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| | [[builderpages:plasmo:z80mb64:newcfmacro|Creating new CF disk]] for Z80SBC64 and Z80MB64 with a TeraTerm Macro |
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