Search found 90 matches

by ijor
Tue Jan 08, 2019 1:23 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Datel RF302R
Replies: 22
Views: 2750

Re: Datel RF302R

By cable twist, I don't mean cable inversion like with the Gotek, but rather the cable select twist that switches the drive A/B select and motor enable signals on an old fashioned floppy cable, between connectors. I'm not sure that would work because the ST uses a single motor on signal. And note t...
by ijor
Tue Jan 08, 2019 12:17 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Datel RF302R
Replies: 22
Views: 2750

Re: Datel RF302R

If internal and external were DS0 by design, why would Atari put DRIVE0 and DRIVE1 select on separate lines to the external floppy connector ? This is only for models without internal drive so that you could connect two external drives. Actually looking at the STFM schematic, DRIVE1 and DRIVE0 and ...
by ijor
Tue Jan 08, 2019 11:54 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Datel RF302R
Replies: 22
Views: 2750

Re: Datel RF302R

The ST is designed so that all drives, internal and external, should be configured as DS0. Due to the internal wiring, an external drive configured as DS0 will be seen as DS1 by the computer. If the drive can't be configured as DS0 (Gotek certainly can), then you need to switch the signals somehow b...
by ijor
Tue Jan 08, 2019 12:40 am
Forum: ST 16MHz V2.X SERIES BOOSTERS
Topic: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)
Replies: 448
Views: 56600

Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

My only theory currently is GLUE sets BR high before setting BGACK low.. So by the time BGACK comes, BR has gone high and DMA cycle tries to start when the CPU is has not released the bus as it sees BR goes high... I would have thought BR from GLUE wouldn't go high until GLUE sees BG going low.. wh...
by ijor
Sat Jan 05, 2019 1:20 am
Forum: TF330
Topic: TF330 Bus Switches SN74CB3T3245PW
Replies: 14
Views: 2277

Re: TF330 Bus Switches SN74CB3T3245PW

Though I still have issues :( Its acting like ( I think ) the other texas part I tried out, like the chips not even plugged into the board. It seems to me that you are probably making some obvious mistake and for some reason you don't see it. It happened to me more than once, it happens to all of u...
by ijor
Mon Dec 31, 2018 10:09 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 526
Views: 64141

Re: Project: HDMI/DVI out for STFM

Any news? Hope this will fully working on 2019! :)
by ijor
Sat Dec 29, 2018 12:04 pm
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 285
Views: 36733

Re: BLITTER RE-CREATION THOUGHTS

I found a NXP part GTL2003 so ordered one yesterday and arrived today.. and this one works!! Great! Interestingly, The 3.3V side doesn't seem to actually need a pull up resistor, and it still outputs 3.3V... So I need to look into that more, but that would save needing all the pull up resistors! I ...
by ijor
Sat Dec 22, 2018 9:29 pm
Forum: ALPHA DEVELOPMENT INFO
Topic: DMA port "update" ideas..
Replies: 128
Views: 15870

Re: DMA port "update" ideas..

I'm not sure that running the DMA at 16MHz will accelerate any transfer as the GLUE/MMU are the one generating the memory address for the transfer and not the DMA itself (it only has A1 from the address bus). So running it at 16 MHz would only affect the signals generated by the DMA and it might en...
by ijor
Sat Dec 22, 2018 11:52 am
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 285
Views: 36733

Re: BLITTER RE-CREATION THOUGHTS

I was just thinking ahead that ultimately GLUE , MMU, BLITTER could all go in a single FPGA, Kinda is like that on the STE already. You can fit a whole ST system on a Max 10. The whole ST chipset plus CPU, FDC, MFP, Sound chip, etc, they all fit on a single Max 10, and you could still have plenty o...
by ijor
Sat Dec 22, 2018 1:33 am
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 285
Views: 36733

Re: BLITTER RE-CREATION THOUGHTS

I have tried VCC at 5V, 3.3V, with and without diode. I have tried pretty much every possible combination of everything with all the chips I have tested. Have you considered the possibility that the chip is defective, or got damaged, or you got the wrong part, or something wrong with the board? The...

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