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by frank.lukas
Mon Mar 04, 2024 12:28 pm
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 21
Views: 482

Re: No clock signal to the Shifter

rubber_jonnie wrote: Mon Mar 04, 2024 11:18 am It looks to be the same REV as the OP, so there may well be jumpers/pads on this variant to allow 2 ROM sets.
Yes, there is a 74LS11 for the 2 chip Eprom config ...
by frank.lukas
Mon Mar 04, 2024 11:08 am
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 21
Views: 482

Re: No clock signal to the Shifter

rubber_jonnie wrote: Mon Mar 04, 2024 10:40 am But would that affect the oscillator circuit? Surely that just requires power to provide the clock signals and nothing from the OS?
No but boot up with a white screen this is because no 6 chip TOS is installed. I think because of the white screen the clock on the shifter is ok ...
by frank.lukas
Mon Mar 04, 2024 10:26 am
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 21
Views: 482

Re: No clock signal to the Shifter

All STM mainboards are for 6 chip TOS only isn't it ...
by frank.lukas
Thu Feb 22, 2024 12:01 pm
Forum: HARDWARE ISSUES
Topic: MegaSTE repair
Replies: 66
Views: 19864

Re: MegaSTE repair

I had installed gold-plated Atari PLCC sockets from BEST ...
by frank.lukas
Thu Feb 08, 2024 5:00 pm
Forum: EXXOS WEBSTORE INFORMATION
Topic: 1.44MB Mega STE floppy drive
Replies: 3
Views: 236

Re: 1.44MB Mega STE floppy drive

Atari MegaSTE, Atari TT and Atari Falcon can handle normal PC Floppy drives. You must set der Floppy to DriveSelect 0 and you have to put in a Atari AJAX Floppy Controller Chip in. The DIP switch 7 set to ON select the HD Mode ...
by frank.lukas
Fri Jan 12, 2024 4:59 pm
Forum: HARD DRIVES
Topic: Mega ST Hard drive mount
Replies: 13
Views: 3560

Re: Mega ST Hard drive mount

I still had an ICD box from a micro adapter and this sheet metal was included I think. No idea how it fit ?

ICD_Blech.jpg
ICD_Blech.jpg (747 KiB) Viewed 309 times
by frank.lukas
Wed Jan 10, 2024 7:14 am
Forum: HARD DRIVES
Topic: Mega ST Hard drive mount
Replies: 13
Views: 3560

Re: Mega ST Hard drive mount

Back then, Hard&Soft also had a set for the Atari Mega ST including a sheet metal plate including spacer bolts. There are numerous mounting holes in the manboard, for example for a graphics card. The 3.5 Zoll SCSI hard drive was rotated 90 degrees next to the floppy in the front left area of the...
by frank.lukas
Fri Dec 15, 2023 7:36 pm
Forum: MEMBER BLOGS
Topic: OJ’s projects…usually breaking stuff.
Replies: 13
Views: 16913

Re: OJ’s projects…usually breaking stuff.

Take a closer look at the soldering of the ET4000AX chip and may be resolder it with a lot of good flux. I also had a defective card where the bus driver chips were defective. For the data bus 74LS245 chips and for the address bus faster 74F244 chips may be swap these out?
by frank.lukas
Fri Dec 15, 2023 5:50 pm
Forum: MEMBER BLOGS
Topic: OJ’s projects…usually breaking stuff.
Replies: 13
Views: 16913

Re: OJ’s projects…usually breaking stuff.

How much ET4000 ISA cards do you have for testing ?
by frank.lukas
Fri Dec 15, 2023 4:00 pm
Forum: MEMBER BLOGS
Topic: OJ’s projects…usually breaking stuff.
Replies: 13
Views: 16913

Re: OJ’s projects…usually breaking stuff.

Because of the pixel garbage on the graphics card please test...

- Run the STGA with the original 68000 CPU
- if you use a relocator CPU board for the SF536, test without it. (you can build a Mega ST bus extension to try it out)

mst_extension.jpg
mst_extension.jpg (109.54 KiB) Viewed 7844 times

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