/* Imported from Wayback Machine Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:rc2014miniupgrade Snapshot date: 2025-10-15 Generator : wayback-archiver */ ==== Table of Contents ==== [[#upgrade_rc2014mini_to_run_cp_m22|Upgrade RC2014Mini to run CP/M2.2]] [[#introduction|Introduction]] [[#materials_required|Materials required]] [[#k_ram_upgrade|64K RAM Upgrade]] [[#k_rom_upgrade|16K ROM Upgrade]] [[#add_rom-to-ram_paging_circuit|Add ROM-to-RAM paging circuit]] [[#cpu_clock_upgrade|CPU Clock Upgrade]] [[#cf_card|CF Card]] [[#software|Software]] [[#manual|Manual]] ====== Upgrade RC2014Mini to run CP/M2.2 ====== ===== Introduction ===== This is a step-by-step guide for upgrading a RC2014 Mini so it can run CP/M 2.2. [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=a06e49&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/rc2014mini_upgrade/dsc_45210615.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=453&tok=e958e3&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Frc2014mini_upgrade%2Fdsc_45210615.jpg?600x453|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_rc2014mini_upgrade_dsc_45210615.jpg}}]] [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=2ae9b7&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/rc2014mini_upgrade/dsc_45190615.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=431&tok=59bac9&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Frc2014mini_upgrade%2Fdsc_45190615.jpg?600x431|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_rc2014mini_upgrade_dsc_45190615.jpg}}]] ===== Materials required ===== The following are needed to perform the upgrade: 28-pin 600-mil wide socket 128Kx8 RAM, AS6C1008, TC551001, or KM681000 MCP130-460DI voltage supervisor W27C512 EEPROM 14.7456MHz full-size oscillator Compact Flash board I/O address strapped to 0x10 to 0x17 ===== 64K RAM Upgrade ===== Remove the 32K RAM, AS6C62256 from its socket. The upgraded RAM is a 128Kx8 RAM such as AS6C1008, TC551001, or KM681000) which is a 32-pin device. The 32-pin device is larger than the existing space can accommodate so it needs to be mounted on a 28-pin socket that, in turn, plugs into the existing 28-pin socket so the extra 4 pins hang over the socket and above the Z80 CPU. The following is modification to the 128Kx8 RAM and its socket: Connect pin 2 of 128Kx8 RAM to pin32 of RAM, Connect pin 32 of RAM to pin 30 of the socket Cut off the skinny leg portion of pin 22 and straighten out the remaining lead so it won't touch the socket; connect a wire from the remaining lead to ground (pin 16) of RAM. Connect pin 22 of the socket to pin 31 of RAM Cut off the skinny leg portion of pin 30 and straighten out the remaining lead so it won't touch the socket; connect a wire to the remaining lead and leave it unconnected for now. [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1bd174&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/rc2014mini_upgrade/64k_ram_upgrade.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=304&tok=ca2132&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Frc2014mini_upgrade%2F64k_ram_upgrade.jpg?500x304|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_rc2014mini_upgrade_64k_ram_upgrade.jpg}}]] Insert the RAM along with its socket in the original 28-pin RAM socket. Pin 1,2, 31,32 of the RAM should hang over the Z80 CPU Thread the uncommitted wire (connected to pin 30 of RAM) through the center hole of the RC2014Mini pc board to the solder side; connect to pin 11 of U1 [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=ae5225&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/rc2014mini_upgrade/rc2014mini_cpm_upgrade_component.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=323&tok=3236b9&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Frc2014mini_upgrade%2Frc2014mini_cpm_upgrade_component.jpg?500x323|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_rc2014mini_upgrade_rc2014mini_cpm_upgrade_component.jpg}}]] [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=7eb10a&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/rc2014mini_upgrade/rc2014mini_cpm_upgrade_solder.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=293&tok=a51f8e&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Frc2014mini_upgrade%2Frc2014mini_cpm_upgrade_solder.jpg?500x293|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_rc2014mini_upgrade_rc2014mini_cpm_upgrade_solder.jpg}}]] ===== 16K ROM Upgrade ===== ===== Add ROM-to-RAM paging circuit ===== ===== CPU Clock Upgrade ===== ===== CF Card ===== ===== Software ===== [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:rc2014mini_upgrade:minimon.zip|MiniMon]], Simple monitor for RC2014 Mini CP/M2.2, CPM BDOS/CCP/BIOS for MiniMon ===== Manual ===== MiniMon operating guide Installing CP/M in a new CF disk