exxos's Atari, Amiga & retro forum

UPDATE

1. Got a H4 #2 to solder up. I have the board but haven't order any parts for it yet. Don't have a spare shifter and they are quite impossible to find. So this will probably be a board for the new HDMI board in developing stages.
   
   I have a shifter now thanks to Exxos got some in his store.
   
   
2. Doing a Alt-RAM board with 256Kb ROM switcher on it. Schematics and board has been done. 5 PCB is being made. Parts has been ordered.
   
   PCB has arrived. Not seen the board yet though. I am at my cottage now and the pcb is at home in the flat. In the post box.
   
   
3. Mega-ST IDE board. Same as rubber_jonnie has done. Made a few changes to the board design. I have soldered one board and have 4 more. I have not burnt the GAL for it yet though. Don't have a Mega or the GAL burner here in the flat. Probably use this with a 27C4001/27C040 and a small board I got some time ago to switch between 4 different ROMs.
   
   Desoldered a IDE/SD board I have and solder in some female pin header instead. Burnt a GAL. Built up two 28 to 32 pin ROM adapter so I can use it for random chips. Burnt TOS 2.06 and TOS 1.04 (with bootable IDE driver) and tried it out. Works great. Installed it in a Mega ST1.
   
   IDE_SD_desolder.jpg
   28to32pin.jpg
   IDEand206decoderBoard.jpg
   MegaSTwithIDEandTOS206.jpg
   
   
4. 
   
   
5. Get the PAK68/3-030 to 50MHz. Now at 40 MHz. Need to get hold of FRAK, PuPla or perhaps PCB for or doing board myself. Seems a long way to go.
   
   I might have a PuPla2 and a FRAK board soon. The deal haven't been made yet since shipment in Corona time thru the world/Europe is a bit troublesome. The PuPla is already built but the FRAK is just the PCB so need to order components for that after the deal is done.
   
   
6. Solder up a IDE-PCB R1C v1.1 i got from exxos. I have the parts for this.
   
   Yes, this is done. Not tested. I haven't got an adapter for 40/44pin IDE or a SD/CF-IDE board with 44pin. I think I have at home in the flat. I might have here. I have to check.
   
   IDE_R1C_11.jpg
   IDE_R1C_11_fixes.jpg
   
   

Oh yeah, I have modded my UV eraser I got from china some time ago. I hated the noise it made with that mechanical knob/handle. Bought a timer board and some buttons. It even remember the time when unplugged so I don't need to set that every time. Looks like shit inside.

Fixed a STfm board. Sockets on everything. Almost. Changed resistor arrays on data/address bus and 10k resistor array on the WD1772 also. Did a 2 chip conversion by adding the 74LS11 and some solder blobs changing.

But had some troubles and had to check some solder spots since I didn't get it started. Noticed that I had got som solder blobs shorts when using a solder sucker. God I hate those.

Managed to put one of TOS 1.02 chips upside down and got white screen of course on boot. Diag cart didn't work either. Didn't find that problem for a while. Kind of obvious when you do find it:
I happened to do this with a TOS 1.02 german language before and the worked fine so I guess it it just luck if it survives. Those to in the pic is in the garbage now.

Well that boards finally running now.

Did a recap on a SR98 PSU for the board above. My keyboard that I fixed is being used with the board above. Need a case for it. Actually need two cases. One for my H4 #2 as well.

Did a transplant meanwell PSU on a MegaST PSU plate for my second Mega ST.

I have ordered some new caps to change them all on both the Mega main board.

I have made schematics for the MV16 cartridge and made a new SMT clone of it. Half as big as the original. So that PCB is on it's way from china.

Got some PCB from china. Did the rom decoder board @Smonson linked to in this post. Also got the ROM adapter PCB inspired by Martin Šoltés 32 to 28pin adapter. Tried it out in a Mega 1. Worked right away.

:bravo: :coolpics: :goodpost:

Sweet!

Nice! :dualthumbup:

Had bought some 29C010 in TSOP32 package some time ago. So made a adapter PCB for it to fit a DIP28 and also got that in the recent shipment from the PCB manufacturer. Burnt TOS 2.06 on the 29C010 chip and solder up a set and it worked great with the previous ROM decoder board. Will do some test with 29C020 (and maybe 29C040 later on) to get EmuTOS and TOS 2.06 with just a flip of a switch.

@DoG interesring choice of eprom, what speed are they?

PhilC wrote: 09 Jul 2020 20:11 @DoG interesring choice of eprom, what speed are they?

70ns

Looks like a very good solution for Mega and STFMs