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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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4th Sep 2021, 2:03 am | #1 |
Heptode
Join Date: Aug 2009
Location: Worthing, Sussex, UK.
Posts: 662
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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. |
6th Sep 2021, 11:50 am | #2 |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,587
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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/ |