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--- builderpages:plasmo:p90mb [2022/01/16 22:05] – Revision from 2022-01-16
+++ builderpages:plasmo:p90mb [2026/06/15 13:09] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:p90mb
+   Snapshot date: 2024-03-08
+   Generator    : wayback-archiver
+*/
+====== P90MB, P90CE201 Motherboard ======
+===== Introduction =====
+P90MB is a motherboard based on P90CE201 with 3 RC2014-like expansion slots.
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=63436c&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_55070106.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_55070106.jpg?600x394|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_dsc_55070106.jpg}}]]
+===== Features =====
+P90CE201 at 24MHz
+K PROM
+K RAM
+EPM7032S CPLD
+Compact flash interface
+I2C connectors
+Three RC2014-like expansion slots
+CP/M68K ready
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=ba9ce2&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/p90mb_r0_connector.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/p90mb_r0_connector.jpg?500x328|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_p90mb_r0_connector.jpg}}]]
+===== Design Information =====
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90mb_scm_r0.pdf|Schematic]]
+Gerber [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90mb_r0.zip|photoplot]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:bill_of_materials_for_p90mb_r0.pdf|Bill of Materials]]
+==== Engineering Change ====
+A engineering change is required for more reliable CF access. The 8 data pins (pins 3, 5, 7, 9, 11, 13, 15, 17) to the CF adapter are removed and replaced with 8 100 ohm resistors. Similarly the IORD pin (pin 25) of the CF adapter is removed and replaced with a 100 ohm resistor. Even with the engineering change, it will not work with all CF disks. The CF disk that seems to work reliably is CISCO 64 Meg CF disk.
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=ce0e80&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_54990104.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_54990104.jpg?500x473|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_dsc_54990104.jpg}}]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=7bb4e8&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_55020104.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_55020104.jpg?500x378|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_dsc_55020104.jpg}}]]
+==== Software ====
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:x688loader_r1_5.zip|P90MB monitor]]
+CP/M68K [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90bios.zip|BIOS]]
+CP/M68K [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:distro_updated.zip|distribution files]], plus gkermit, microEmac, and BASIC compiler. Unzip and use gkermit to upload to P90MB. The console baud rate needs to change to 9600 baud for gkermit to work.
+Lee Davison's [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:ehbasic_for_p90mb.zip|EhBasic for P90CE201]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:loader1_5_ehbasic_cpm.zip|EPROM programming file]] with monitor, CP/M, and EhBasic
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:lifeoled_with_2_array_51sec.zip|Conway's Game of Life]] running on P90MB. This requires a 128×64 OLED display plugged into the I2C connector. The scenerio running is “Gosper Gun”.
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1df4d0&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/game_of_life_p90mb_gosper.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/game_of_life_p90mb_gosper.jpg?350x259|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_game_of_life_p90mb_gosper.jpg}}]]
+===== Documentation =====
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90ce201.pdf|P90CE201]] Datasheet
+[[builderpages:plasmo:p90mb:getting_started|Getting Started]] with P90MB
+----
+===== Works to be done =====
+Kermit file transfer is not working in CP/M68K. The most likely reason is because hardware handshake is required and P90CE201 UART has no hardware handshake signals.
+XMODEM maybe a better replacement for Kermit
+Kermit works at 9600 baud, so the simplest solution is to add a command to switch baud rate.
+CP/M68K's DDT is not working.