====== 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/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/protorc3/frr512proto/dsc_65450517.jpg?direct&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/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/protorc3/frr512proto/dsc_65400516.jpg?direct&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 =====

{{:builderpages:plasmo:protorc3:frr512proto:frr512proto_rev0_scm.pdf|Schematic}}

{{:builderpages:plasmo:protorc3:frr512proto:frr512k_proto_cpld.zip|CPLD design file}}

  * {{:builderpages:plasmo:protorc3:frr512proto:frr512kproto_cpld_scm_with_cf_i2c.pdf|PDF schematic}}  of CPLD design

Engineering Changes

{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/protorc3/frr512proto/frr512kproto_wiring.jpg?direct&400x645}}