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VDP indirect register access
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
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
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!)
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
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.
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?
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?
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?
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
Score: 127.22 %,
Type: wiki , Comments: 0 comments
3-2)
VRAM 128kB
Media MSX cartridges
Video Yamaha V9938
Audio PSG (probably ...
