{"id":3189,"date":"2025-10-23T11:41:11","date_gmt":"2025-10-23T10:41:11","guid":{"rendered":"https:\/\/www.robertprice.co.uk\/robblog\/?p=3189"},"modified":"2025-10-23T11:41:12","modified_gmt":"2025-10-23T10:41:12","slug":"rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language","status":"publish","type":"post","link":"https:\/\/www.robertprice.co.uk\/robblog\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\/","title":{"rendered":"RC2025 \u2013 Part 6 \u2013 Using an 8&#215;8 LED matrix from Z80 assembly language"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">As part of the 2025 RetroChallenge I&#8217;ve been developing an NES controller module for the RC2014 computer.  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Up until now, I&#8217;ve just been outputting to a terminal. However, I&#8217;d like to use something a bit more visual on the RC2014. I&#8217;ve decided to use <a href=\"https:\/\/peacockmedia.software\/RC2014\/8x8_matrix\/\">Peacock Media&#8217;s 8&#215;8 LED matrix module<\/a> for this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The module works by outputting an 8-bit value to one IO port for the row and another 8-bit value to another IO port for the column. These describe which LEDs should be enabled. Each bit in the byte refers to either a row or a column.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The default IO port for the row is 0, and the default IO port for the column is 2.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/LEDMatrix.svg\"><img loading=\"lazy\" decoding=\"async\" width=\"741\" height=\"730\" src=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/LEDMatrix.svg\" alt=\"\" class=\"wp-image-3191\"\/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If I want the top left corner to light, I need to set bit 8 of the column and bit 1 of the row.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you have the SCM (Small Computer Monitor) program running on an RC2014, you can quickly test it out using the following.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>o 0 1\no 2 80<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This sets the row to hexadecimal 1, which in binary is 00000001, and the column to hexadecimal 80 which in binary is 1000000. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A smiley face in BASIC<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the documentation for the 8&#215;8 module, Shelia Dixon gives us an example BASIC program to draw a smiley face. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This works by rapidly updating the pixels rather than keeping them permanently on. Repeated fast enough, persistence of vision makes the LEDs appear to be on constantly.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 FOR I=0 TO 7\n20 READ R,C\n30 OUT 2,0 : OUT 0,R : OUT 2,C\n40 NEXT I\n50 RESTORE\n60 GOTO 10\n1000 DATA 1,60, 2,66, 4,169, 8,169\n1010 DATA 16,133, 32,185, 64,66, 128,60<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">A smiley face in Z80 assembly language<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">I wanted to convert the BASIC program to Z80 assembly language to help me better understand how this works.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I take a similar approach to the BASIC program. I iterate over a loop 8 times to represent the current Row. I keep this counter in register b. In register c, I keep the current bit the row is pointing to. In each iteration, I read a byte of data from memory that represents the Column. The position in memory is pointed to by register pair hl.  Once the data has been output, I then shift the value in register c to the right so it points to the next row.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The final code looks like this.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\n; A simple program to display a smiley face on an 8x8 LED matrix\n; connected to the RC2014 Z80 computer.\n; Robert Price - 19th October 2025\n;\n; Based on the original BASIC example by Shiela Dixon\n        ORG $9000\n\nROW     EQU 0\nCOLUMN  EQU 2\n\nmain:\n        ld b, 8           ; 8 rows to display\n        ld c, 0b10000000  ; start with bit 7 set for row 8\n        ld hl, data       ; point to the smiley data\n.loop:\n        xor a             ; clear a\n        out (COLUMN), a   ; clear the columns\n        ld a, c           ; get the current row bit\n        out (ROW), a      ; select the row\n        ld a, (hl)        ; get the column data for this row\n        out (COLUMN), a   ; output the column data\n        inc hl            ; point to next row data\n        srl c             ; shift to next row bit\n        djnz .loop        ; loop for all 8 rows        \n\n        jr main           ; repeat forever\n\ndata:\n        db 0b00111100     ; 60\n        db 0b01000010     ; 66\n        db 0b10111001     ; 185\n        db 0b10000101     ; 133\n        db 0b10101001     ; 169\n        db 0b10101001     ; 169\n        db 0b01000010     ; 66  \n        db 0b00111100     ; 60\n\n        END<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>As part of the 2025 RetroChallenge I&#8217;ve been developing an NES controller module for the RC2014 computer. Up until now, I&#8217;ve just been outputting to a terminal. However, I&#8217;d like to use something a bit more visual on the RC2014. I&#8217;ve decided to use Peacock Media&#8217;s 8&#215;8 LED matrix module for this. The module works &hellip; <a href=\"https:\/\/www.robertprice.co.uk\/robblog\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;RC2025 \u2013 Part 6 \u2013 Using an 8&#215;8 LED matrix from Z80 assembly language&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3199,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[181,187],"tags":[191,117,185,119],"class_list":["post-3189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rc2025","category-retrochallenge","tag-led-matrix","tag-rc2014","tag-rc2025","tag-z80"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RC2025 \u2013 Part 6 \u2013 Using an 8x8 LED matrix from Z80 assembly language - Robert Price<\/title>\n<meta name=\"description\" content=\"Looking at how the 8x8 LED matrix module works on an RC2014 computer. Example code is given in both BASIC and Z80 assembly language.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.robertprice.co.uk\/robblog\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RC2025 \u2013 Part 6 \u2013 Using an 8x8 LED matrix from Z80 assembly language - Robert Price\" \/>\n<meta property=\"og:description\" content=\"Looking at how the 8x8 LED matrix module works on an RC2014 computer. Example code is given in both BASIC and Z80 assembly language.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.robertprice.co.uk\/robblog\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\/\" \/>\n<meta property=\"og:site_name\" content=\"Robert Price\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-23T10:41:11+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-23T10:41:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.robertprice.co.uk\/robblog\/assets\/rc2014-smiley.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"768\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"rob\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rob\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/\"},\"author\":{\"name\":\"rob\",\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/#\\\/schema\\\/person\\\/fac6d5b076e0e14e1fb13e15b542a6c5\"},\"headline\":\"RC2025 \u2013 Part 6 \u2013 Using an 8&#215;8 LED matrix from Z80 assembly language\",\"datePublished\":\"2025-10-23T10:41:11+00:00\",\"dateModified\":\"2025-10-23T10:41:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/\"},\"wordCount\":367,\"image\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/assets\\\/rc2014-smiley.jpg\",\"keywords\":[\"LED Matrix\",\"RC2014\",\"RC2025\",\"Z80\"],\"articleSection\":[\"RC2025\",\"RetroChallenge\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/\",\"url\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/\",\"name\":\"RC2025 \u2013 Part 6 \u2013 Using an 8x8 LED matrix from Z80 assembly language - Robert Price\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/rc2025-part-6-using-an-8x8-led-matrix-from-z80-assembly-language\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/assets\\\/rc2014-smiley.jpg\",\"datePublished\":\"2025-10-23T10:41:11+00:00\",\"dateModified\":\"2025-10-23T10:41:12+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.robertprice.co.uk\\\/robblog\\\/#\\\/schema\\\/person\\\/fac6d5b076e0e14e1fb13e15b542a6c5\"},\"description\":\"Looking at how the 8x8 LED matrix module works on an RC2014 computer. 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