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This shows you the differences between two versions of the page.

--- boards:ecb:vga3:construction [2021/06/21 16:06] – Revision from 2021-06-21
+++ boards:ecb:vga3:construction [2026/06/15 12:51] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://retrobrewcomputers.org/doku.php?id=boards:ecb:vga3:construction
+   Snapshot date: 2024-08-09
+   Generator    : wayback-archiver
+*/
+====== Construction Information ======
+The most up-to-date board revision as of 5/29/2017 is 1.0-003. The Bill-Of-Materials below reflects a number of chip substitutions:
+Two of the 74LS244's are updated to 74ACT244 logic; one is unchanged
+Two of the 74LS374's are updated to 74ACT374 logic
+C1, 22uf on the schematic, is updated to 100uf or larger.
+Two 10uf Tantalum capacitors are substituted at C9 and C11.
+The GAL chips are both ATF16V8BQL-15PU. The 15ns speed is important. Slower and faster GALs have led to unreliable operation. The -BQL suffix is the lowest power version.
+Layout Indicating updates:
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:ecb-vga3-layout-2017-05-29c.png|{{boards:ecb:vga3:ecb-vga3-layout-2017-05-29c.png?720x428}}]]
+===== Construction Files =====
+^Filename                                                                                                                                                                                                           ^Size ^Updated    ^
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?tok=500f2f&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fexe%2Ffetch.php%3Fmedia%3Dboards%3Aecb%3Avga3%3Aecb-vga3-bom-2017-05-26.png|ECB-VGA3-BOM.png]]|191kb|26-May-2017|
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:ecb-vga3-bom.ods|ECB-VGA3-BOM.ods]]                                                                                                       |20kb |26-May-2017|
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:vga3-cupl-jed.zip|ECB-VGA3-CUPL-JED.zip]]                                                                                                 |2.6kb|07-May-2017|
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:ecb_vga3-mfg.zip|ECB-VGA3-Gerber-mfg.zip]]                                                                                                |0.6mb|12-Apr-2017|
+===== Programming =====
+The Programmers' Reference Manual is primarily for system programming at the BIOS level. Direct memory-mapped updating of display memory operates in a fashion identical to that of the IBM MDA/CGA/EGA/VGA adapters.
+The schematic does not reflect the component substitutions specified in the BOM. Several components require update to faster versions.
+^Filename                                                                                                                            ^Size  ^Updated    ^
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:vga3_prog_ref_man_1-1.pdf|VGA3-Programmers' Reference 1.1]]|333kb |15-May-2017|
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:vga3-tst.zip|VGA3 Test Programs]]                          |355kb |24-Jul-2017|
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:ecb-vga3-003-sch.pdf|VGA3 Schematic 1.0-003]]              |493kb |31-Jan-2015|
+|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:vga3:hd6445_datasheet.pdf|HD6445 Datasheet]]                    |1023kb|           |
+\\
+===== Testing =====
+The test program ZIP file contains a tarball of the source, which includes a number of font files. The ZAP fonts are used under the [[https://www.gnu.org/licenses/gpl-3.0.en.html|GPL 3.0 license]].
+^Program    ^Description                                                                        ^
+|v3mtst.com |Test of onboard memory.                                                            |
+|v3tpat.com |80×25 screen alignment pattern - jumpers HSYNC=neg, VSYNC=pos                      |
+|v3tpat2.com|80×30 screen alignment pattern - jumpers HSYNC=neg, VSYNC=neg                      |
+|v3tpat3.com|80×25 70hz screen alignment pattern - jumpers HSYNC=neg, VSYNC=pos. Escape to exit.|
+|v3tpat4.com|80×30 60hz screen alignment pattern - jumpers HSYNC=neg, VSYNC=neg. Escape to exit.|
+|v3tpat5.com|80×43 screen alignment pattern - jumpers HSYNC=neg, VSYNC=neg. Escape to exit.     |
+|vga3tty.com|Display keyboard scan codes through TTY interface. Reset to exit.                  |
+|vga3kbd.com|Display keyboard scan codes through hardware interface. Reset to exit.             |
+===== Software configuration =====
+Video output and keyboard input for the VGA3 board are supported in ROMWBW. It is included in the default build for the ECB-MK4 only.
+To enable VGA3 board support in other ROMWBW builds, the following option should be enabled:
+<code code>
+VGAENABLE .SET TRUE ; VGA: ENABLE VGA VIDEO/KBD DRIVER (VGA.ASM)
+</code>
+Screen formats supported are 80×25, 80×30 and 80×43, with 80×25 being the default. Display formats can be changed as follows:
+<code code>
+VGASIZ .SET V80X30 ; VGA: DISPLAY FORMAT [V80X25|V80X30|V80X43]
+</code>