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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:
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:
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.
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 GPL 3.0 license.
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:
VGAENABLE .SET TRUE ; VGA: ENABLE VGA VIDEO/KBD DRIVER (VGA.ASM)
Screen formats supported are 80×25, 80×30 and 80×43, with 80×25 being the default. Display formats can be changed as follows:
VGASIZ .SET V80X30 ; VGA: DISPLAY FORMAT [V80X25|V80X30|V80X43]