Search found 137 matches

by tzok
Fri Jan 25, 2019 4:51 pm
Forum: HARDWARE DISCUSSIONS
Topic: 16BIT ROM CART THOUGHTS
Replies: 139
Views: 20624

Re: 16BIT ROM CART THOUGHTS

SysInfo and GemBench work great on my diagnostic cart, thanks! I have not analyzed details of your 16-bit ROM cart, but if you are making a proper use of ROM3/4 lines you may use both 64kB and 128kB ROMs. Yet over-complicated jumper settings tell me that you are switching between 64/128kB cart modes...
by tzok
Thu Jan 24, 2019 10:26 pm
Forum: HARDWARE DISCUSSIONS
Topic: 16BIT ROM CART THOUGHTS
Replies: 139
Views: 20624

Re: 16BIT ROM CART THOUGHTS

Some time ago I was asking about possibility of preparing ROM versions of YAART and SysInfo, but with no response. I only know, that it is impossible to just put an PRG file on a ROM.
by tzok
Wed Jan 09, 2019 10:46 pm
Forum: CHAT FORUM
Topic: Help!Need advice on hooking up RLL drives to SH204
Replies: 3
Views: 565

Re: Help!Need advice on hooking up RLL drives to SH204

RLL drives are 100% backward compatible with RLL controllers, it is only a different encoding scheme. But better to use ST238R for repairing MegaFile 60...
by tzok
Wed Jan 09, 2019 9:34 pm
Forum: CHAT FORUM
Topic: Help!Need advice on hooking up RLL drives to SH204
Replies: 3
Views: 565

Re: Help!Need advice on hooking up RLL drives to SH204

With only power connected they don't spin? What drive ID is set on drive's jumpers? You need to be ID 0, while most PC disks have ID 1. Using an ST238R would be a waste, as this controller won't use RLL encoding. ST238R and ST251 are basically the same drive, but first one has a better quality surfa...
by tzok
Wed Jan 09, 2019 8:51 am
Forum: HARDWARE DISCUSSIONS
Topic: Just got a new SH204 minus the hard drive
Replies: 2
Views: 626

Re: Just got a new SH204 minus the hard drive

SH204 has an Adaptec ST-506/412 compatible HDD controller inside, and can be used only with such disks. It can be either 5,25" or 3,5" and MFM or RLL compatible. SCSI is something completely different. *** Sorry, I was wrong, SH204 was using a SCSI host adapter (ACSI - SCSI "converter"), and a SCSI ...
by tzok
Fri Dec 14, 2018 8:50 pm
Forum: RTC (Real time clock)
Topic: no-software internal RTC
Replies: 49
Views: 10329

Re: no-software internal RTC

One more notice - as the internal TOS date format is intact, any software using non-standard methods of reading it will still work correctly (however if using 2-digit year format we may see year 118 for 2018). As TOS stores a year on 7 bits it will work only until 2027.
by tzok
Thu Dec 13, 2018 9:44 pm
Forum: MONGREL EDITION DEVELOPMENT & INFO
Topic: POWER CONNECTORS
Replies: 17
Views: 2272

Re: POWER CONNECTORS

I personally dislike the whole idea of STF remake, but I guess adding an ATX connector (possibly with angular header) to use pico-PSU modules would be a very useful solution. Power output connectors on motherboard are obsolete then, as Pico-PSU has a cable to connect FDD power.
by tzok
Sun Dec 02, 2018 4:29 pm
Forum: ELECTRONICS
Topic: Logic Analyser on the Cheap
Replies: 21
Views: 3533

Re: Logic Analyser on the Cheap

Recently I was trying to diagnose my... diagnostic cart with a Logic Analyzer (Logic-8 clone). I did it, but not in the way I'd like to. All lines were looking legit on the LA software, but I realized that, with probes connected, cart behaves differently. So I started disconnecting the probes, one b...
by tzok
Sun Dec 02, 2018 4:17 pm
Forum: ELECTRONICS
Topic: Lead-free soldering
Replies: 46
Views: 5059

Re: Lead-free soldering

I find lead free solder fine for a new stuff, but not for repairing old one. I would't care about inhaling lead, as it almost doesn't vapor during soldering. What is really toxic are the vapors of flux. I'm using Sn60Pb40 with SW26 flux and lead free Sn99Cu0.7Ag0.3 with 1.1.3 flux (1.1.3 a.k.a. SW-2...
by tzok
Thu Nov 29, 2018 9:31 am
Forum: ROM UPGRADES
Topic: STF 6 CHIP ROM LOCATIONS
Replies: 1
Views: 1768

Re: STF 6 CHIP ROM LOCATIONS

This is a TOS ROM chip layout for 520ST:
520ST.jpg
520ST ROM layout
520ST.jpg (252.64 KiB) Viewed 1098 times

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