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*/

==== Table of Contents ====

[[#frugal_512k_ram_rom_prototype|Frugal 512K RAM/ROM Prototype]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#design_information|Design Information]]

====== Frugal 512K RAM/ROM Prototype ======

===== Introduction =====

This is [[builderpages:plasmo:frr512k:rev0|FRR512K]] prototyped on a ProtoRC3 board

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=f89deb&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/protorc3/frr512proto/dsc_65450517.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=344&tok=69e499&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fprotorc3%2Ffrr512proto%2Fdsc_65450517.jpg?600x344|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_protorc3_frr512proto_dsc_65450517.jpg}}]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=160388&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/protorc3/frr512proto/dsc_65400516.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=411&tok=f6e246&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fprotorc3%2Ffrr512proto%2Fdsc_65400516.jpg?500x411|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_protorc3_frr512proto_dsc_65400516.jpg}}]]

===== Features =====

Low cost 32-macrocell CPLD

512K EPROM based on SST39SF040

512K RAM based on AS6C4008

Compact flash interface

I2C interface

Compatible with ROMWBW

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

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:protorc3:frr512proto:frr512proto_rev0_scm.pdf|Schematic]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:protorc3:frr512proto:frr512k_proto_cpld.zip|CPLD design file]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:protorc3:frr512proto:frr512kproto_cpld_scm_with_cf_i2c.pdf|PDF schematic]] of CPLD design

Engineering Changes

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=f0bcca&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fprotorc3%2Ffrr512proto%2Ffrr512kproto_wiring.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=400&h=645&tok=9ebda7&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fprotorc3%2Ffrr512proto%2Ffrr512kproto_wiring.jpg?400x645|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_protorc3_frr512proto_frr512kproto_wiring.jpg}}]]