In article <4D27E96D.5080408 at bitsavers.org>, Al Kossow <aek at bitsavers.org> writes: I found some links to articles in HP Journal: <http://www.hparchive.com/Journals/HPJ-1983-01.pdf> <http://www.hparchive.com/Journals/HPJ-1987-06.pdf> -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

You;r not the first, and won't be last, to confuse thsoe 2 interfaces... I wouldlove to find some detailed infromation on the 2 ICs used for HP-HIL. I have pinouts, but little more. The 'master' IC occupies 4 locations (it has 2 address bit inputs) in the computer's address space, knowing waht all thsoe ports do would be interesting. The 'slave' IC seems to have a Microwire/SPI interface (it was normally, but no always, used with a COP400 series microcontroller), again knowing what you cna send/received over said interface would be interesting. -tony