07-25-2016, 04:06 PM
I just acquired a very clean and functional HP-9836CU. It has two 1M memory boards and boots perfectly into the BASIC 2.0 ROM board I have from my Franken-9826.
The boot messages identify the machine has having "Color Graphics", which is should, but simple test programs in BASIC elicit nothing: the screen never switches from text mode to graphics mode when GINIT executes. I can manually switch by pressing the "Graphics" key on the keyboard, but it always displays a blank screen until I press "Alpha" to switch back.
In other words, I can't display anything except green text.
The only thing that occurs to me is that my BASIC ROM is version 2.0, whereas the "BASIC Graphics Techniques" manual I have is version 2.1, but even if the syntax is wrong I should at least get some sort of error from the BASIC runtime, which I'm not.
Any ideas?
(Also, if anyone knows where I can find more manuals and disks for this machine, please let me know.)
The boot messages identify the machine has having "Color Graphics", which is should, but simple test programs in BASIC elicit nothing: the screen never switches from text mode to graphics mode when GINIT executes. I can manually switch by pressing the "Graphics" key on the keyboard, but it always displays a blank screen until I press "Alpha" to switch back.
In other words, I can't display anything except green text.
The only thing that occurs to me is that my BASIC ROM is version 2.0, whereas the "BASIC Graphics Techniques" manual I have is version 2.1, but even if the syntax is wrong I should at least get some sort of error from the BASIC runtime, which I'm not.
Any ideas?
(Also, if anyone knows where I can find more manuals and disks for this machine, please let me know.)