/* Imported from Wayback Machine
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   Snapshot date: 2025-02-09
   Generator    : wayback-archiver
*/

==== Table of Contents ====

[[#x688_experimental_prototype_for_p90ce201|X688, Experimental prototype for P90CE201]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#design_information|Design Information]]

[[#software|Software]]

[[#manuals|Manuals]]

====== X688, Experimental prototype for P90CE201 ======

===== Introduction =====

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:p90ce201.pdf|P90CE201]] is derived from 68000 but with 8-bit data bus, 24-bit address bus and integrated I/O. Please see this page for [[builderpages:plasmo:x688:x688ec|X688 with engineering change]] that allows it to run CP/M68K

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=6bf835&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/x688/dsc_54291127.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=273&tok=c421af&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fx688%2Fdsc_54291127.jpg?600x273|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_x688_dsc_54291127.jpg}}]]

===== Features =====

P90CE201 running at 22MHz

512KB EPROM

512KB RAM

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

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:x688_scm_r0.pdf|Schematic]]

Gerber [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:x688_r0.zip|photoplots]]

==== Software ====

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:x688loader_rev0_3_with_ehbasic.zip|S Record loader]] is a very simple monitor that load Motorola S records into RAM and start program execution from 0x1001000.

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:ramdiag_run_in_high_ram.zip|Memory diagnostic]] checking RAM memory from top of the program to 0x107F000

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:ehbasic_for_p90ce201_run_in_high_ram.zip|EhBasic]] is Lee Davison's enhanced Basic for 68K.

===== Manuals =====

Getting Started with X688

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:x688:p90ce201.pdf|P90CE201]] Data Sheet