#eproms

[hiddenpalaceorg]

Sonic Month Part 4a - Sonic 2 (Sep 14, 1992 proto)

https://hiddenpalace.org/News/Sonic_Month_Part_4_-_Filling_Blanks_With_Sonic_2_(MD)

TCRF (@CuttingRoomWiki) & Hidden Palace present, a brand new Sonic 2 prototype for MD! This one comes between Simon Wai and CENSOR and has many differences. Special stage changes, late zone changes, and more. Be sure to check it out!

Sonic the Hedgehog 2 (Sep 14, 1992 prototype)

Stay tuned for the next release tomorrow (11/10)! Be sure to check out the stream at 2PM Pacific time (10PM GMT), or 5PM EST tomorrow!

[hiddenpalaceorg]

Mr Tuff + Donations/Discord

Mr. Tuff (Dec 5, 1994 prototype)

We have a few things to discuss in this announcement, but first we have something to share with you today. We have a new dump of an unreleased game called Mr. Tuff for the SNES! The game was developed by SCI (The Sales Curve) and was possibly going to be published by Ocean. It was scheduled to be released on the SNES, Sega CD, and Sega Mega Drive. The game was actually in a fairly complete state in the middle of 1994, but wasn’t picked up by anyone until later that year when Ocean considered picking it up for a release in March 1995. The various versions of the game were previewed throughout 1994 and were even reviewed in 1995 by DieHard GameFan magazine. The game was still teased throughout 1995, but completely disappeared near the end of the same year.

In other news, we finally opened up a Discord server! This was something that many users requested for a while since we have been clinging on to good old IRC and message boards for many years. We’ve decided that now would be a good time to open up a Discord server, since we predict a need to communicate with our user base on future happenings, projects, etc. The Discord is still in its early stages, so if you have any suggestions be sure to let us know!

You can join the server by going to the following link: https://discord.gg/RG723tU 

Finally, we have something interesting coming up. We will share more details soon, but we are in the process of acquiring some major new prototypes. If you are interested in learning more and would like to donate towards that goal, please send us an email at [email protected] or get on our Discord! We don’t normally ask for donations, but this is quite a rare opportunity.

[commodorez]

I’ve manged to remove the hard-soldered traces that determine chip select, address lines, and voltages for the H19 ROMs. 

There are two sockets in the design, but most implementations are new enough to use a single EA8332 Mask ROM, instead of two EA8316′s.  I had to cut a few traces, due to the late era of this board’s manufacture.  However, now it matches the style of the oldest variations, with the flexibility that was intended.

I also removed 4 of the 5 on-board linear voltage regulators and hard-wired the board to accept +5V, +12V, and -12V directly from a power supply.  Now I just need to perform some tests with a bench power supply to confirm that I’ve done it correctly.  After that, I need to swap in some custom ROMs and hope it all works out.

[commodorez]

Major epiphany occurred today on my H19 project. Turns out that there are a handful of registers in the MC6845P CRT controller that handle things related to display frame and sync. I could rewrite those values on a custom ROM and fix the overscan/frame size issues in software. Software! I'm going to need to learn how to dump and burn EPROMs... and acquire tools to do those things. But it doesn't stop there, I could write my own ROMs for all kinds of things in my collection. It's always been an intimidating prospect, and without any kind of specific task in mind, I have yet to pursue that realm of knowledge. But now I have something to strive for. Then it dawned on me that I could also write boot routines for said terminal. Have it start off saying some specific text on screen for the user to see. I need to discuss this with Lee Hart.