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*/

====== ZRC Rev2 with SIMM-30 Memory ======

===== Introduction =====

ZRC rev2 is derived from [[builderpages:plasmo:zrc:simm30tester|ZRC SIMM30 tester]]. It uses SIMM30 memory as its main memory. It can accommodate up to 32 meg memory.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=0b066a&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/zrc/dsc_78060205.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/zrc/dsc_78060205.jpg?600x222|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_zrc_dsc_78060205.jpg}}]]

===== Features =====

Z80 at 14.7MHz

Dual SIMM-30 sockets

EPM7128SQC100 CPLD

Emulate MC6850 serial port

DRAM controller

256 banks of 32K RAM

Glue logic

Compact Flash interface

RC2014 Bus Interface

I2C Bus

===== Design Files =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:zrc_rev2_simm30_scm.pdf|Schematic]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:zrc_r2_gerber.zip|Gerber photoplots]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:zrcrev2_simm30_cpld_8meg_256banks.zip|CPLD design files]]

Bill of Materials

Memory map

==== Software ====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:rev1_1pcb_cpldcf.zip|ROMCPLD]], 64-byte bootstrap ROM resides in CPLD

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:zrc_zrserloader.zip|Serial loader]], 256-byte program loaded by ROMCPLD into 0xB000. ← load the binary file ZRSerld.bin

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:rev1_1pcb_zrcmon_v07.zip|ZRCMon, rev0.7]],

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc:rcz80zrc_hex.zip|ROMWBW]] for ZRC. This is ROMWBW binary image converted to Extended Intel Hex file to be loaded into ZRC