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wait 15 T-States between reading and writing to Vram

by norakomi on 09-01-2022, 11:33
Score: 128.82 %, Type: Forum topic , Comments: 51 comments
VRAM accesses is equal to 13 Z80 clock cycles (@3.58MHz) If I read the V9938 VRAM timings (part ... does match, but this actually also applies to TEXT1 mode (width 40), as V9938 VRAM timings (part 2) ...

Question about sprite mode 2

by Max-me on 13-02-2022, 14:39
Score: 148.32 %, Type: Forum topic , Comments: 3 comments
be 1 unless you want mirroring to occur. See page 93 of the V9938 application manual . So if you ...

VDP indirect register access

by lintweaker on 20-02-2022, 14:47
Score: 154.88 %, Type: Forum topic , Comments: 0 comments
Learned something today about the V9938/58 indirect register access which I never gave a thought before I am playing with an FPGA VGA text mode adapter which mirrors the MSX text screen (screen 0 and 1) by snooping on VDP IO access. As the BIOS of MSX2 and up uses the VDP indirect register access ...

Remaining VRAM in screen 8

by megatron-uk on 21-02-2022, 09:34
Score: 138.92 %, Type: Forum topic , Comments: 5 comments
at http://m.gr8bit.ru/gr8bit-knowledge-base.html For the V9938-programmers-guide.pdf (Development) ...

Problem NMS-8245 2+, black screen

by Caliostro on 10-06-2021, 16:04
Score: 126.88 %, Type: Forum topic , Comments: 61 comments
to remove the VDP check with a V9938 and original ROM unfortunately I don't have ...

screen 8 smooth horizontal scrolling

by ARTRAG on 26-02-2011, 12:57
Score: 98.53 %, Type: Forum topic , Comments: 104 comments
are more frequent. Now, that we know a little more about v9938 timing i think would be worth ... the 'state' of the currently running command? Afaik they do. Anyway, look in the V9938 application ... multiple commands in a single frame and squeze the last drop of speed from v9938. As we know, the vdp ...

v9938, Text mode 1, and the LN bit of register 9

by kanageddaamen on 28-02-2022, 04:42
Score: 1406.28 %, Type: Forum topic , Comments: 4 comments
on a project with the v9938 as the video chip, working with an sram replacement for the memory. I am seeing ... a hardware problem See the TEXT 2 Mode section See the TEXT 2 Mode section of the V9938 ... with my circuit/ram solution. To test the wiring of the v9938, I am controlling it with a PIC ...

Is the V9938 compatible with SRAM ?

by Gsparis on 16-12-2010, 08:42
Score: 1377.23 %, Type: Forum topic , Comments: 20 comments
Hi Everyone, I recently managed to get some V9938 VDP chips and am thinking about making ... to implement in a design and in a PCB) instead of DRAM chips. So my question is: Does the V9938 VDP chip ... of the V9938 but I don't Flyguille, I re-read the datasheet of the V9938 but I don't see ...

Conversion from SVI-738 MSX2 to MSX2+ (HELP!)

by fernando3k on 26-02-2022, 12:47
Score: 139.03 %, Type: Forum topic , Comments: 17 comments
logo, then it looks normal. In fact, I tried placing the V9938 (without wiring) and it does exactly ...

V9990 is not part of MSX

by mars2000you on 14-01-2022, 21:49
Score: 131.35 %, Type: Forum topic , Comments: 132 comments
than their V9938 or V9958, and not very similar to Ricoh's S-PPU. Yamaha's Mark III VDP is also a very different continuation of the TMS99xx from their V9938 with a more focus on sprites, tiled ... I/O). If you want to superimpose the V9990 behind the V9938, just use a Philips NMS8280, Sanyo ...
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