[Osborne 1] OZROM memory tester

[clueless_engineer (Brett)]

Hi,

Thanks again to @nelgin for making the 3rd party OZROM BIOS ROM available. I was able to use it to identify a faulty RAM chip in my Model 1. Replaced it and the memory test was then clear.

This also solved some issues with software I was having ... the CP/M Help and SuperCalc wouldn't work, for example, which makes sense.

I made a video here.

And here are some explanatory images.

You can find the ROM and manual on my Github, and maybe more places now.

 

[ArcadeDanger]

Thanks for posting the video on how to use the OZROM for the memory test, I installed the 2764 daughterboard adapter you designed and burned the 1.44v + OZROM image onto the EPROM and it worked, both modes, perfectly. I'll need to design a switch to mount on the front case to switch between them, but that's for another day. Thank you!

 

[clueless_engineer (Brett)]

Thanks for posting the video on how to use the OZROM for the memory test, I installed the 2764 daughterboard adapter you designed and burned the 1.44v + OZROM image onto the EPROM and it worked, both modes, perfectly. I'll need to design a switch to mount on the front case to switch between them, but that's for another day. Thank you!

Excellent. I accidentally put my switch on the right hand side of the front panel ... where I've seen the RCA socket for the hi-res board usually goes ... reason is that I was drilling from the back or something ... so left was right and I didn't think ... "measure twice, drill once". Anyway, it works! And who needs more than 52 columns at once??

There's a bunch of other functionality provided by the OZROM but I think the missing configuration disk/program is probably required for most of it.

Brett.

 

[cj7hawk]

Excellent. I accidentally put my switch on the right hand side of the front panel ... where I've seen the RCA socket for the hi-res board usually goes ... reason is that I was drilling from the back or something ... so left was right and I didn't think ... "measure twice, drill once". Anyway, it works! And who needs more than 52 columns at once??

There's a bunch of other functionality provided by the OZROM but I think the missing configuration disk/program is probably required for most of it.

Brett.

If the product gets in the way of the ScreenPAC PCB, then the obvious solution then is to build a new 80 column display PCB