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by czietz
Fri Jul 17, 2020 7:44 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 3057
Views: 780370

Re: exxos blog - random goings on

RTFM certainly helps. :lol: Quoting the README: Three large random tables are used. One provides unit double precision values in the range (-1.0 -> +1.0), another raises unit random values to 2^+/-N where N is a random in the range (-128 -> +127), another uses pure random binary data which may inclu...
by czietz
Thu Jul 16, 2020 7:31 am
Forum: HARDWARE ISSUES
Topic: UltraSatan SD Card file corruption.
Replies: 19
Views: 6054

Re: UltraSatan SD Card file corruption.

Have you tried the Hitachi 68k cpu. They all appear to be cmos architecture even the hc sieres. While the Motorola CPU is cmos on the non Hc and hcmos on there hc parts Just for the record: For 68000 (non-HC) Motorola did not use a CMOS process, but NMOS. Same goes for Hitachi's 68000: NMOS, not CM...
by czietz
Wed Jul 15, 2020 6:29 am
Forum: ATARI MUSIC NETWORK
Topic: What upgrades to STfm and which MIDI sequencers to try
Replies: 6
Views: 5460

Re: What upgrades to STfm and which MIDI sequencers to try

I see there is a thing called a Lightning ST and Cloudy. I tried emailing the guy about it but the email address didn't work... What did you mean by "didn't work"? Did you get a bounce / error message? Or didn't you just get a reply, yet? In any case, I'm one of the developers of the Ligh...
by czietz
Tue Jul 14, 2020 10:04 am
Forum: HARDWARE ISSUES
Topic: 4mb STFM SMD Ram upgrade - FAILS TO BOOT :(
Replies: 26
Views: 8943

Re: 4mb STFM SMD Ram upgrade - FAILS TO BOOT :(

Lurch wrote: Tue Jul 14, 2020 9:42 am I'm wondering, would the board power up with 0mb ram?
Without RAM, TOS won't boot and you will not get any meaningful screen output. The diagnostic cartridge is able to output error messages over the serial port even on a board completely without RAM.
by czietz
Sun Jul 12, 2020 5:00 pm
Forum: GAME ZONE
Topic: WIP Atari ST ScummVM-lite
Replies: 232
Views: 132332

Re: WIP Atari ST ScummVM-lite

Also, Purple Tentacle isn't exactly -- well -- purple... :lol:
by czietz
Fri Jul 10, 2020 4:06 pm
Forum: HARDWARE ISSUES
Topic: Mega st 2 boot problem
Replies: 10
Views: 4337

Re: Mega st 2 boot problem

rubber_jonnie wrote: Fri Jul 10, 2020 3:54 pm If that diode is a factory job, be nice to know what the heck it is for, neither of mine have that.
Reducing the supply voltage of the IMP Shifter.

From an Atari technical document:
modification_imp.PNG
modification_imp.PNG (236.9 KiB) Viewed 3346 times
by czietz
Fri Jul 10, 2020 10:26 am
Forum: TF536
Topic: TF536/68000 switching
Replies: 23
Views: 8792

Re: TF536/68000 switching

@czietz doesn't that assume the 68000 is plugged ontop of the pak ? Things could get more of a problem when the CPU is on the motherboard. In case of the PAK, the 68000 is in indeed on top. But the three signals I mentioned are the only ones that are not connected straight through. Thus, (without t...
by czietz
Fri Jul 10, 2020 10:02 am
Forum: TF536
Topic: TF536/68000 switching
Replies: 23
Views: 8792

Re: TF536/68000 switching

The venerable PAK/2 accelerator (1990 vintage) already had the capability to switch between accelerated CPU (68020) and 68000. For that, it had to switch three CPU signals: BR, BG, and E. This article is in German but Google Translate and the GAL equations should give you the required information: h...
by czietz
Wed Jul 08, 2020 6:36 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 107
Views: 50957

Re: Cartridge keys and emulation

@djhardrich, @Tomswork: Thank you very much. I have forwarded your offer to the EmuTOS developers mailing list. Hopefully, one of my fellow developers will have the time to investigate.
by czietz
Sun Jul 05, 2020 6:48 pm
Forum: HARDWARE DISCUSSIONS
Topic: My summer project: A colour Stacy
Replies: 222
Views: 87056

Re: My summer project: A colour Stacy

derkom wrote: Sat Jul 04, 2020 6:20 pm And since that made enough space to play with, here's a couple of photos for @czietz...
Thank you. Looks great!

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