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by czietz
Fri Mar 03, 2023 7:19 am
Forum: HARDWARE ISSUES
Topic: Turning on STacy only 2 times out of 10 does it start.
Replies: 84
Views: 10576

Re: Turning on STacy only 2 times out of 10 does it start.

DoG wrote: Thu Mar 02, 2023 9:29 pm There is no PAL/GAL on a MegaST.
of-course-there-is.jpg
of-course-there-is.jpg (188.2 KiB) Viewed 941 times
by czietz
Tue Feb 21, 2023 5:54 pm
Forum: HARDWARE ISSUES
Topic: Nova compatible boards
Replies: 17
Views: 2012

Re: Nova compatible boards

Doing multiple changes at once is detrimental to the fault-finding process, I'm afraid to say. What I would have done instead: - With the already pre-installed GAL "ET4"... - without doing any HW mods... - I would have just set the jumper to MSTE, which is the correct setting. But I guess ...
by czietz
Fri Feb 17, 2023 4:27 pm
Forum: HARDWARE ISSUES
Topic: Nova compatible boards
Replies: 17
Views: 2012

Re: Nova compatible boards

Frank already mentioned the most important detail: for an ET4000, the jumper needs to be in the MSTE setting even on a TT. As for EmuTOS: you don't need to program it into EPROMs necessarily. There is a .prg version, which includes Nova support, too: https://sourceforge.net/projects/emutos/files/sna...
by czietz
Fri Feb 17, 2023 7:13 am
Forum: HARDWARE ISSUES
Topic: Nova compatible boards
Replies: 17
Views: 2012

Re: Nova compatible boards

Which GAL on the Nova?
Correct jumper setting on the Nova?
Does EmuTOS recognize the cards?
by czietz
Sat Jan 28, 2023 9:38 am
Forum: HARDWARE ISSUES
Topic: ClockInACan using 32.084988 crystal from an ST
Replies: 3
Views: 651

Re: ClockInACan using 32.084988 crystal from an ST

PS: The datasheet of the IC used by the "clock in a can" confirms this: "The NJU6311 is a fundamental quartz crystal oscillator".
by czietz
Sat Jan 28, 2023 9:23 am
Forum: HARDWARE ISSUES
Topic: ClockInACan using 32.084988 crystal from an ST
Replies: 3
Views: 651

Re: ClockInACan using 32.084988 crystal from an ST

Rest assured that these are proper 32.xxx MHz crystals. If you put your scope to the oscillator circuit in an ST, you can see the crystal oscillating at 32.xxx MHz. It's quite common to operate crystals at their overtone frequency, e.g., ≈3xfundamental, i.e. 3x10.6xx MHz. See here: https://www.jauch...
by czietz
Wed Jan 11, 2023 9:52 pm
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: Blitter investigations and research from a software perspective
Replies: 14
Views: 1925

Re: Blitter investigations and research from a software perspective

Without looking it up (in the schematics at https://www.chzsoft.de/asic-web/) I would assume that the Blitter doesn't even have the LSB of the address implemented. In other words: you can't write an odd source or destination address to the respective registers.
by czietz
Sun Jan 08, 2023 3:24 pm
Forum: HARD DRIVES
Topic: Seagate ST-251 MFM HD problem
Replies: 7
Views: 1337

Re: Seagate ST-251 MFM HD problem

Looking at the PCB (http://bitsavers.informatik.uni-stuttgart.de/pdf/seagate/mfm/ST-251/ST251_f.jpg), many of the chips are Seagate ASICs apparently (and, thus, unobtainium). But I do see that the µC has a 2732 EPROM connected to it, a dump of which someone also put at Bitsavers, along with the sche...
by czietz
Sun Jan 01, 2023 10:37 am
Forum: PHOENIX ZONE
Topic: The plan for 2023 - H5 roadmap
Replies: 4
Views: 1566

Re: The plan for 2023 - H5 roadmap

I have to wonder, though: Why "hack" TOS 2.06, when there is EmuTOS? Imho, a modern, advanced hardware platform should be supported by a modern OS.
by czietz
Thu Dec 29, 2022 1:47 pm
Forum: DSTB1 & DFB1 booster by BadWolf
Topic: DFB1 Support thread
Replies: 272
Views: 21036

Re: DFB1 Support thread

Meanwhile, HDDRIVER 11.14 was released today with the fix that Frank had already successfully tested: https://www.hddriver.net/en/news.html.

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