/* Imported from Wayback Machine
   Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:p90mb:p90mb_r1
   Snapshot date: 2024-11-06
   Generator    : wayback-archiver
*/

==== Table of Contents ====

[[#p90mb_rev1_p90ce201_motherboard|P90MB Rev1, P90CE201 Motherboard]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#design_information|Design Information]]

[[#software|Software]]

[[#documentation|Documentation]]

====== P90MB Rev1, P90CE201 Motherboard ======

===== Introduction =====

P90MB is a motherboard based on P90CE201 with 3 RCBus (AKA RC2014-compatible) expansion slots.

Link to previous version of P90MB, [[builderpages:plasmo:p90mb|P90MB rev0]].

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=8d9ca5&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/dsc_72040214.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=553&tok=e30863&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fp90mb%2Fdsc_72040214.jpg?600x553|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_dsc_72040214.jpg}}]]

===== Features =====

P90CE201 at 12MHz

512K PROM

512K RAM

EPM7032S CPLD

Compact flash interface

I2C connectors

Three RCBus (formerly RC2014-compatible) expansion slots

CP/M68K ready

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=36cd8f&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/p90mb/p90mb_rev1_annotated.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=353&tok=e609c6&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fp90mb%2Fp90mb_rev1_annotated.jpg?500x353|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_p90mb_p90mb_rev1_annotated.jpg}}]]

===== Design Information =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90mb_scm_r1.pdf|Schematic]]

Gerber [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90mb_gerber_r1.zip|photoplot]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:p90mb_rev1_cpld_released.zip|CPLD design files]]

Schematic of [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:released_top_cpld_scm_rev1pcb_.pdf|CPLD in PDF]] format

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:p90mb:bill_of_materials_for_p90mb_r0.pdf|Bill of Materials]]

==== 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”. Note the pin assignment of I2C connector is (left to right) VCC, GND, SCL, SDA. There are some 128×64 OLED display with different pin assignments on the market.

[[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/exe/fetch.php?w=350&h=259&tok=83d02f&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fp90mb%2Fgame_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