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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 4th Sep 2021, 1:03 am   #1
JohnBHanson
Heptode
 
Join Date: Aug 2009
Location: Worthing, Sussex, UK.
Posts: 605
Default Northstar Advantage owner needed to run program

I am investigating the actual memory layout of the video memory of the Northstar Advantage computer.

Most documentation state that the video memory is 20k which consists
of a bank of 16k and a bank of 4k (which is repeated four times).

However the circuit diagram of the video memory consists of two banks of 4116 memory chips which gives 32k.

I have written an emulator for the NorthStar Advantage and would like the memory layout to be correct.

To this end I have written a program in Z80 assembler to explore the video memory layout and would like an owner of a real hardware Advantage to run it
for me and let me know what the output is.

The program is written in z80 assembler language (built with m80/l80) and
I am happy to supply the program in source code as well as binary. It does
not write to disk but reports the results to the screen (And a printer if one
is connected by using control+p).

If anyone can help it would be nice.

Thanks.
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Old 6th Sep 2021, 10:50 am   #2
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 7,310
Default Re: Northstar Advantage owner needed to run program

JBH, have you also tried posting this over on the more computer-specific VCFED forums? Although that forum is USA based there is quite a large European contingent on there, including Brits.

https://www.vcfed.org/forum/
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