MiSTer

The MiSTer image for Gorf using the Astrocade interface has been updated. For those of you running them in an arcade environment where customers have to put money in, it will now accept coins from both coin slots (with separate options in the DIP settings) In addition, the SLAM will now work, so if someone…

I’ve updated the bill of materials for the Astrocade interface a little. Two items have been changed to have better descriptions and where people have let me know part numbers from Mouser or Digikey I have added them on.

Version 2.3 of the PCB has arrived, been assembled and tested … and it works without any wire patches! There is, however, one minor problem. I added some extra bits of screen print on the wrong side. This has now been fixed on the gerbers and any future boards will be correct, but I am…

Version 2.3 has been ordered from the PCB makers and will hopefully fix the remaining incorrect track and complete the development of this PCB. I’ve mentioned this on Facebook (on the Gorf group) and had several questions about it, so in an attempt to answer those I have added an information page to the website…

Version 2.2 of the PCB built for Gorf including the 5v regulation to power the MiSTer direct from the cabinet’s power supply. This version uses a 2 amp version of the 7805 regulator and a couple of smoothing capacitors and takes power from the 12v line on the cabinet. An alternate version uses a commonly…

I did some more testing and changes on the MiSTer -> Astrocade interface and have made some changes. Main PCB now includes a ‘Menu’ button to bring up the main OSD. The third speech only channel has been added for Wizard of Wor and I fixed the missing track from V2. The RGB board has…

Populated the necessary locations for Gorf on the new board, did some sanity checks to make sure I wasn’t putting 5v down any lines to the DE10, discovered a missing track and some layout errors. It all works and I even managed to get the speech working from DDRAM, so you don’t actually need to…

The MiSTer core for Cosmic Guerilla has been completed. This core uses a TMS9900 CPU where the original uses a TMS9980 (8 bit version of same CPU, just does 2 byte reads/writes instead of 1 word read/write). However, game speed is controlled using vertical counter, so should be the same as the original. Sound effects…

I thought that swopping the CPU in the cosmic core to allow me to do Cosmic Guerilla would be simple. How wrong was I … 16 bit vs 8 bit, different memory read write signals, different port handling, even the reset is different! Anyway, for the first time it actually shows something running on screen….

One of the first things I did on the MiSTer once I had acquired a setup was to take the code for the Astrocade console, add in the additional hardware used by the arcade versions of the games to see if I could get them running. (See original post here) Following that I then decided…

I managed to complete another core for the MiSTer today, been a while as I needed to get the two PCB’s working enough to sample the sounds. But all of the games from Mame’s Universal Cosmic driver that use a Z80 are now on there. Cosmic Alien, Devil Zone, Magical Spot, No Mans Land and…

Following on from Astrocade hardware, I thought I would like to do a core as near as possible from scratch. So apart from using the Z80 from opencores, and basing the timing code on that used in the Pacman core, I went from the Crazy Balloon schematics to produce a complete core for it. Where…

Well, what a weird year it has been so far.  I’ve been learning to code in VHDL and Verilog on the MiSTer platform. The first task was one I have wanted to do since I bought an FPGA Replay was to take the existing Bally Arcadia console core, add in the necessary extra ram, pattern…