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 Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:frr512k:rev0:emulate_512kram_rom
 Snapshot date: 2023-01-31
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Emulation of RC2014 512K RAM/ROM Board

The original 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.

www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_frr512k_rev0_frr512k_r0_comp_for_32x16kbanks.jpg

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CPLD design file

Engineering Changes to Rev0 PCB

www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_frr512k_rev0_frr512k_r0_comp_mod_for_32x16kbanks.jpg

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