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What is the point of bits [3:0] in the R15 of the PSG
Score: 154.69 %,
Type: Forum topic , Comments: 9 comments
Never touched joystick circuitry too deeply. Looking into the book page 26 I can not get what is the purpose of the IOB0-IOB3 and their connection to the inputs of the port A. Somewhere else I ... IOA5/IOA6 input pins and the IOB0-3 output pins. Normally the outputs are set to 1 by the BIOS ISR to allow ...
New GR8BIT video board
Score: 154.1 %,
Type: Forum topic , Comments: 19 comments
The development took about 6 months - I had to search for information and make tough decisions (search for my posts on SE.EE and AD EngineerZone). I have learned a lot designing it, and very proud it worked properly at the first start. The board can ...
Mapped RAM I/O port read enable strategy
Score: 153.46 %,
Type: Forum topic , Comments: 17 comments
and responds with D2..D0 to the page number reads (Yamaha violating standard?). All other bits D7..D3 ... I can safely identify the size of mapper (3 bits) by writing 0 into the port, and happily use D7..D3 ... when reading previously written values having 0 in D5.
I am interested hearing your thoughts ...
New composite/S-video encoder for MSX
Score: 152.01 %,
Type: Forum topic , Comments: 9 comments
0.741 Vpp. V99xx outputs signals max of 1 Vpp. While AD725 can cope with level above spec, I would say ... think it must be remarkable that color 4 (pure blue) in screen 0 is having small green and red ... COLOR=(4,0,0,7) to get a pure blue.
Bad thing that I am ashamed, Bad thing that I am ashamed, good thing ...
TCP/IP UNAPI standard discrepancy - what to do?
Score: 151.55 %,
Type: Forum topic , Comments: 3 comments
I have several ways to go:
use Nestor's API 1.0;
fork new API 1.1 with corrected register input (and some other changes like references to IP addresses 0.0.0.0 and configuration logic). ...
Pletter issues
Score: 148.84 %,
Type: Forum topic , Comments: 2 comments
Some time ago I was advised to use Pletter for packing data for MSX . The package is having packer for Windows and unpacker for MSX.
I implemented unpacker and found out that unpacked data differs with original one: King's Valley 2 ...
