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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) ...

VDP Specific MSX2+ Registers

by mars2000you on 17-12-2022, 00:48
Score: 135.21 %, Type: wiki , Comments: 0 comments
MAG (MSX1/2/2+/Turbo R) 4/16K selects VRAM configuration. Write 1 if the VDP is not a V9938 nor ... with a digitizer. (V9938 & V9958 only) IE2 enables (1) or disables (0) the light Pen interrupts. (Used only ... the horizontal retrace interrupts indicated by the register 19 . (V9938 & V9958 only) M3-5 are bits ...

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 ...

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 ...

hw sprites era end.

by PingPong on 26-03-2022, 19:04
Score: 141.72 %, Type: Forum topic , Comments: 13 comments
the speed is rougly the same of the v9938 blitter in those modes. somewhere there is a chart about ... that the cpu could override the vdp because the speed is rougly the same of the v9938 blitter in those modes. ...

MSX 2 Direct VRAM access speeds?

by Sandy Brand on 03-04-2022, 14:53
Score: 138.3 %, Type: Forum topic , Comments: 16 comments
http://map.grauw.nl/articles/vdp_tut.php#vramtiming Minimum VRAM access timings in 3.58 MHz Z80 cycles Screen mode VDP mode TMS9918 V9938 / ... with command execution, because I’ve used OUTI many times with the V9938 and never had issues. Re. your ... vertical blanking period. The V9938 and V9958 are also identical in terms of timing. I would be extremely ...

any idea what is wrong with the unrolled loop?

by xchip on 09-04-2022, 15:18
Score: 144 %, Type: Forum topic , Comments: 19 comments
level of technical detail on the internal mechanism here: V9938 VRAM timings V9938 VRAM timings, part II It’s about V9938 but also goes into TMS9918, and the concepts are similar. I’m ...

'Showing' horizontal lines with 'set adjust' VDP register?

by Sandy Brand on 18-04-2022, 00:05
Score: 129.54 %, Type: Forum topic , Comments: 9 comments
on the following machines: Philips NMS 8245 (original, so it has a V9938). Philips NMS 8255 (converted ...

Laser MSX2

by mars2000you on 23-04-2022, 08:21
Score: 127.22 %, Type: wiki , Comments: 0 comments
3-2) VRAM 128kB Media MSX cartridges Video Yamaha V9938 Audio PSG (probably ...
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