Search found 586 matches

by Mask of Destiny
Fri Apr 05, 2019 9:59 pm
Forum: Demos
Topic: Tänzer, a "ninja" game (Dev Diary thread)
Replies: 290
Views: 30330

Re: Tänzer, a "ninja" game (Dev Diary thread)

notaz, what revision is your MD1?
by Mask of Destiny
Wed Apr 03, 2019 6:44 pm
Forum: Cartridge
Topic: EEPROM mapping for homebrew
Replies: 9
Views: 482

Re: EEPROM mapping for homebrew

My 2 cents: standardizing the mapping (i.e. which address and which I2C bits are connected where) is good, but I think allowing the size to be specified in the header is desirable. It might make sense to pick a single "mode" (i.e. how the address is sent), but from my perspective supporting any of t...
by Mask of Destiny
Thu Mar 28, 2019 5:21 pm
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

Re: BlastEm 0.6.0

Hello folks, I've released the next version in the 0.6.X series: BlastEm 0.6.2 . The most notable change for developers is that I have fixed a regression in GDB remote debugging support on Linux and other Unix-like systems (Windows was not affected AFAIK). There are also some small accuracy fixes an...
by Mask of Destiny
Mon Feb 11, 2019 6:48 pm
Forum: Blabla
Topic: 68000 Arcade systems programming
Replies: 14
Views: 1256

Re: 68000 Arcade systems programming

They're not on his site anymore, but Charles MacDonald actually wrote docs describing various Sega Arcade boards and they are archived at various places:
Pre-System 16
System 16B
System 18
System C2
X-Board
System 24
by Mask of Destiny
Sun Jan 27, 2019 3:45 am
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

Re: BlastEm 0.6.0

Cool. Yeah, that definitely finds the rom.db. It's probably how I built the project, but it doesn't actually show anything when I run a rom. I get a blank screen and the following error: "Failed to open shader file default.v.glsl for reading" Shaders are expected to be in the "sharers" subdirectory...
by Mask of Destiny
Thu Jan 24, 2019 10:00 pm
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

Re: BlastEm 0.6.0

Sounds good, I'll give it a go later on. BTW, love the debugging modes on this. This should be very handy! Glad you like them. I have pushed some changes to allow for building a more standard filesystem hierarchy friendly binary. If you want to try it out, grab tip from the repo and build with the ...
by Mask of Destiny
Mon Jan 14, 2019 8:47 pm
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

Re: BlastEm 0.6.0

Installing in Linux is kind of awkward, since it is not looking in standard locations for config files. /etc/, ~ (according to README). The location of blastem.cfg is standard for a per-user config file. It is true that my tarball is a self-contained package rather than something that's designed to...
by Mask of Destiny
Mon Jan 07, 2019 6:30 pm
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

Re: BlastEm 0.6.0

There's only one little issue for me with it: checkboxes look like they mean the opposite they should, ie. a black checkbox means "enabled", which seems odd. Yeah, the default checkbox style is one of my biggest beefs with Nuklear. I'll have to see if there are any easy tweaks that can make it a bi...
by Mask of Destiny
Sat Jan 05, 2019 9:09 pm
Forum: Megadrive/Genesis
Topic: 68K inner workings
Replies: 3
Views: 560

Re: 68K inner workings

Have you had a look at the 68K patents? Looks like you've managed to figure out a lot from the schematic, but the US4325121 patent specifically has a lot of information about how the microcode/nanocode works and includes micro/nanocode listings for a pre-release version of the processor which might ...
by Mask of Destiny
Fri Jan 04, 2019 6:04 pm
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

Re: BlastEm 0.6.0

v0.6.0 ended up being kind of buggy due to an abbreviated QA cycle. v0.6.1 fixes a number of issues and is now available here
by Mask of Destiny
Tue Jan 01, 2019 8:43 am
Forum: Tools
Topic: BlastEm 0.6.0
Replies: 15
Views: 1530

BlastEm 0.6.0

I've released a new version of my Gen/MD emulator. Big change this time is a new UI using the Nuklear toolkit. Unlike the old UI, you can actually change almost all config options through the UI rather than editing the config file. Of interest to developers are some improvements to the VDP debug vie...
by Mask of Destiny
Sat Dec 01, 2018 4:13 am
Forum: Exodus
Topic: Genesis 68K bus timing
Replies: 6
Views: 1128

Re: Genesis 68K bus timing

Here's a small collection of captures of various types of bus interactions. They are in Open Logic Sniffer Project format. Explanations below: direct_color_dma.olp - Capture of the start of 68K->VDP DMA from one of Chilly WIlly's Direct Color DMA samples (note that !CAS and !RAS here refer to VRAM !...
by Mask of Destiny
Fri Nov 30, 2018 6:33 pm
Forum: Exodus
Topic: Genesis 68K bus timing
Replies: 6
Views: 1128

Re: Genesis 68K bus timing

I am searching hardware level information about the interface with the 68K. Do you know if anybody performed logic analyzer traces showing the timing of the clock and the bus control signals? Yes. 68K clock is always the master clock/7 (unless you count the Teradrive which can also run the CPU at 1...
by Mask of Destiny
Tue Nov 20, 2018 7:30 pm
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 2255

Re: Looping access from 68K and Z80

My breakout boards cam it but sadly the pads for the pins on the chip were just a tad too short. New boards ordered but with the US holiday coming up it’ll be 10-14 days before I get them back. In the meantime, I found a semiconductor seller that had some genesis chips in stock so I picked up a cou...
by Mask of Destiny
Thu Oct 11, 2018 7:12 pm
Forum: Megadrive/Genesis
Topic: Bus Arbiter and IO Chip Access
Replies: 28
Views: 3470

Re: Bus Arbiter and IO Chip Access

It would be interesting to verify is there are any differences regarding EDCLK between MD VA1 and late rmodels since it seems VA1 (and likely VA0) is using an earlier version of 315-5345 chip (see 315-5339 description here: http://www.tmeeco.eu/SMD/MD1VA1_315-5339.jpg) which does not use VCLK (and ...