HP-41 and video interface 82163a / 92198a

[Dave Frederickson]

My 92198A manual is dated 1/84. Here's the 71B supplement.

  92198A Supplement .pdf (Size: 406.04 KB / Downloads: 47)

[rprosperi]

(04-24-2017 03:44 PM)Dave Frederickson Wrote:  My 92198A manual is dated 1/84. Here's the 71B supplement.

Thanks for sharing the '71 Supplement.

My pre-HP, Mountain Computer only branded manual is dated June 1983, Manual No. 11-MC00701A-02.

As it's pre-71 announcement, it includes model-specific content only for 41C, 75 and 85. I presume the HP-branded version is the same, with no '71 content except for the supplement?

[Dave Frederickson]

(04-24-2017 05:24 PM)rprosperi Wrote:  

(04-24-2017 03:44 PM)Dave Frederickson Wrote:  My 92198A manual is dated 1/84. Here's the 71B supplement.

Thanks for sharing the '71 Supplement.

My pre-HP, Mountain Computer only branded manual is dated June 1983, Manual No. 11-MC00701A-02.

As it's pre-71 announcement, it includes model-specific content only for 41C, 75 and 85. I presume the HP-branded version is the same, with no '71 content except for the supplement?

See manual on the HP41 DVD.

[Mark Hardman]

(04-24-2017 03:11 AM)Dave Frederickson Wrote:  I tried connecting the interface to the composite input on my monitor but experienced a lot of jitter. Marcus suggested I try a vintage monitor and that did the trick. I suspect that modern composite interfaces have a higher input bandwidth than the vintage CRT monitors. I would think that some sort of filter would eliminate the higher frequencies that are causing the jitter, but was unsuccessful finding something.

Dave

I was hoping to verify that the video interface was working before purchasing (and paying freight) for a composite monitor. From what you are saying, a composite to HDMI converter would work well enough to do just that.

Thanks!

Mark Hardman

[Dave Frederickson]

(04-25-2017 02:00 AM)Mark Hardman Wrote:  I was hoping to verify that the video interface was working before purchasing (and paying freight) for a composite monitor. From what you are saying, a composite to HDMI converter would work well enough to do just that.

I tried a converter, too, and it to exhibited jitter, but it'll verify whether or not the interface is working. If the interface is good I have a 14" National NL-214C you can have.

Dave