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What is the point of bits [3:0] in the R15 of the PSG

by Eugeny_Brychkov on 05-12-2019, 17:56
Score: 154.29 %, 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

by Eugeny_Brychkov on 12-11-2019, 21:34
Score: 153.69 %, 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

by Eugeny_Brychkov on 03-10-2019, 10:03
Score: 153.06 %, 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

by Eugeny_Brychkov on 17-06-2019, 16:11
Score: 151.6 %, 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?

by Eugeny_Brychkov on 20-05-2019, 17:52
Score: 151.15 %, 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

by Eugeny_Brychkov on 06-01-2019, 20:20
Score: 148.43 %, 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 ...

Hot unplug: how to properly perform COLD boot of Turbo machine?

by Eugeny_Brychkov on 16-11-2018, 14:55
Score: 147.72 %, Type: Forum topic , Comments: 0 comments
Issue: after reconfiguration GR8NET jumps to the address 0. Before reconfiguration GR8NET had ... to the address 0, machine sees that it is warm boot, and skips many initialization steps, including ... (e.g. @ 04D0), machine jumps to slot's address not having Nextor any more, and fails. Question: ...

Please try [GR8NET] + [MFR SCC+ SD] in Panasonic FS-A1WSX

by Eugeny_Brychkov on 18-10-2018, 21:21
Score: 147.32 %, Type: Forum topic , Comments: 6 comments
I have a report from the owner of the all three devices that they do not work when all are being employed. When GR8NET and MFR are inserted into the machine, machine behaves weirdly restarting and rebooting, but sometimes works properly after ...

PLATOTerm for MSX? What is it?

by Eugeny_Brychkov on 20-09-2018, 10:58
Score: 146.79 %, Type: Forum topic , Comments: 2 comments
https://www.msx.org/forum/msx-talk/development/irataonline-p... Thank you, I am jumping into Thank you, I am jumping into that thread. (General ...

How to properly detect MSX-DOS version?

by Eugeny_Brychkov on 19-09-2018, 09:33
Score: 153.65 %, Type: Forum topic , Comments: 16 comments
"RETURN VERSION NUMBER (0CH)" seems gives the wrong information. Try with Try with DISKVE. ... wrote: BDOS's "RETURN VERSION NUMBER (0CH)" seems gives the wrong information. ... compatibility with MSX-DOS 1.0, the following procedure should always be followed in using this function. ...
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