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--- builderpages:plasmo:frr512k:rev0:emulate_512kram_rom [2023/01/31 07:39] – Initial import from Wayback Machine
+++ builderpages:plasmo:frr512k:rev0:emulate_512kram_rom [2026/06/15 12:02] (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:frr512k:rev0:emulate_512kram_rom
+   Snapshot date: 2023-01-31
+   Generator    : wayback-archiver
+*/
+====== Emulation of RC2014 512K RAM/ROM Board ======
+The original [[https://rc2014.co.uk/modules/512k-rom-512k-ram-module/|RC2014 512K RAM/ROM board]] has 32 banks of RAM and 32 banks of ROM; each bank is 16KB in size. This modification of FRR512K emulate RC2014's 512K RAM/ROM board.
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=be0532&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_comp_for_32x16kbanks.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_comp_for_32x16kbanks.jpg?600x338|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_frr512k_rev0_frr512k_r0_comp_for_32x16kbanks.jpg}}]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=51b7ad&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_solder_wired_for_32x16kbanks.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_solder_wired_for_32x16kbanks.jpg?600x386|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_frr512k_rev0_frr512k_r0_solder_wired_for_32x16kbanks.jpg}}]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:frr512k:rev0:frr512k_rev0_cpld_32x16k_banks.zip|CPLD design]] file
+===== Engineering Changes to Rev0 PCB =====
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=c8d25b&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_comp_mod_for_32x16kbanks.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_comp_mod_for_32x16kbanks.jpg?400x241|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_frr512k_rev0_frr512k_r0_comp_mod_for_32x16kbanks.jpg}}]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=9a7a40&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_solder_mod_for_32x16kbanks.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/frr512k/rev0/frr512k_r0_solder_mod_for_32x16kbanks.jpg?400x237|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_frr512k_rev0_frr512k_r0_solder_mod_for_32x16kbanks.jpg}}]]
+=== CUT ===
+On the component side of rev0 PCB, cut trace from D7 to CPLD pin 19 near CPLD
+On the solder side of rev0 PCB, cut trace from nM1 to CPLD pin 4 near the RC2014 connector
+On the solder side of rev0 PCB, cut trace from A14 to RAM & ROM near the RC2014 connector
+=== JUMPERS ===
+A14 to CPLD, RC2014-pin 2 to CPLD-pin4
+Bank0 to A14 of EPROM, CPLD-pin19 to U5-pin29
+D4 to CPLD, U5-pin18 to T4
+D5 to CPLD, U5-pin19 to T3