/* Imported from Wayback Machine
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   Snapshot date: 2025-11-12
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*/

==== Table of Contents ====

[[#cpldtil_6-digit_led_display|CPLDTIL, 6-digit LED display]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#function|Function]]

[[#design_information|Design Information]]

====== CPLDTIL, 6-digit LED display ======

===== Introduction =====

CPLDTIL is a RC2014-compatible 6-digit LED display; each digit is made of 20 individual 0603 LEDs.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=7ff4c1&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/cpldtil/dsc_50821106.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=421&tok=ac1438&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fcpldtil%2Fdsc_50821106.jpg?600x421|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_cpldtil_dsc_50821106.jpg}}]]

===== Features =====

RC2014 compatible

6 digits with individual 0603 LEDs

Programmable functionalities with EPM7128S

5 user definable programmable I/O

Operate with 22MHz Z80

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=e6c8e9&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/cpldtil/dsc_50801106.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=401&tok=b409ba&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fcpldtil%2Fdsc_50801106.jpg?600x401|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_cpldtil_dsc_50801106.jpg}}]]

===== Function =====

The CPLDTIL is driven by an Altera EPM7128S which is in-situ programmable. Current firmware allocate I/O locations 0xE8 to first two digits; location 0xE9 to the middle two digits, and location 0xEA to last 2 digits.

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

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:cpldtil:cpldtil_r2_scm_1.pdf|Schematic]]

PC board [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:cpldtil:cpldtil_r2.zip|photoplots]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:cpldtil:cpldtil_cpld_release_11_6_19.zip|CPLD equations]]