/* Imported from Wayback Machine
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*/

==== Table of Contents ====

[[#zrc512_a_hobbyist-friendly_z80_sbc_for_rom-less_romwbw|ZRC512, A Hobbyist-friendly Z80 SBC for ROM-less RomWBW]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#theory_of_operation|Theory of Operation]]

[[#design_information|Design Information]]

[[#software|Software]]

[[#manuals|Manuals]]

[[#online_discussions|Online discussions]]

====== ZRC512, A Hobbyist-friendly Z80 SBC for ROM-less RomWBW ======

===== Introduction =====

ZRC512 is a faster and hobbyist-friendly variant of ZRC. It is designed specifically for ROM-less RomWBW. Description of ZRC512 online [[https://groups.google.com/g/retro-comp/c/bILDMVI97vo|here]].

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=e3afcf&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/zrc512/zrc512_rev0_pcb.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=224&tok=abcb8a&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fzrc512%2Fzrc512_rev0_pcb.jpg?600x224|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_zrc512_zrc512_rev0_pcb.jpg}}]]

===== Features =====

Z80 at 22MHz

512K RAM in 16 banks of 32K

Compact flash interface

Altera EPM7128S CPLD

64-byte bootstrap ROM

Serial port

Decode for RAM, CF, and peripherals

I2C interface

DS1302 RTC interface

WS2812B interface

RC2014 bus interface

5V at 250mA, typical

2“x4” 4-layer pc board

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1d53c7&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/zrc512/zrc512_rev0_annotated.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=301&tok=0c2c56&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fzrc512%2Fzrc512_rev0_annotated.jpg?500x301|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_zrc512_zrc512_rev0_annotated.jpg}}]]

===== Theory of Operation =====

Place holder

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

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512_rev0_scm.pdf|Schematic]]

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512_rev0_gerber.zip|Gerber photoplots]]

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512_rev0_bom.pdf|Bill of Materials]]

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512_rev0_pcb_cpld_released.zip|CPLD design]]

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

==== Software ====

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512mon_rev0_3.zip|ZRC512 Monitor]], rev0.3

ROM-less RomWBW for ZRC512

CF [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512_romwbw_hd1k_zrc512_combo.zip|disk image]] of ZRC512 monitor and RomWBW. Unzip this file and use Win32DiskImagers to copy the image to 64meg or larger CF disk

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:zrc512_addition_to_romwbw_source.zip|ZRC512 addition]] to RomWBW source. Future update of RomWBW should include these files. This zip file includes a command file “BuildZRC512.cmd” and a directory “ZRC512” that go into RomWBW\Source directory.

[[builderpages:plasmo:zrc512:driving_ws2812|Driving WS2812 NeoPixel LED]]. The linked page describe the operation for bit-bang WS2812 LED. A demo program included.

Disk [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:zrc512:cf_image_romwbw_zrc512_working_vgarc.zip|image of ZRC512 + VGARC]] to support standalone computer with monochrome text VGA display and PS2 keyboard.

==== Manuals ====

==== Online discussions ====

Discussion about ZRC512 on [[https://groups.google.com/g/retro-comp/c/bILDMVI97vo|Google forum]]. There were informative discussions about different flavors of WS2812D starting from Dec 19 2023.