Getting a TF536 working on my Mega ST.

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PhilC
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Re: Getting a TF536 working on my Mega ST.

Post by PhilC »

@PaulJ as in its set up with the instruments set up procedure etc. Wont pretend I'm the expert there.
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PaulJ
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Re: Getting a TF536 working on my Mega ST.

Post by PaulJ »

If you connected the probe to the scope calibrator which is usually a 1k square wave with a fast rise time and adjusted the variable cap in the probe for a square corner on the square wave you did the probe compensation. Important if your looking at overshoot and undershoot on a pulse or square wave. :)
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Re: Getting a TF536 working on my Mega ST.

Post by PhilC »

PaulJ wrote: Wed Jul 22, 2020 7:23 pm If you connected the probe to the scope calibrator which is usually a 1k square wave with a fast rise time and adjusted the variable cap in the probe for a square corner on the square wave you did the probe compensation. Important if your looking at overshoot and undershoot on a pulse or square wave. :)
Yes, done as part of the procedure but thanks for the tip anyway :D
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Umberto1st
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Re: Getting a TF536 working on my Mega ST.

Post by Umberto1st »

DoG wrote: Wed Jul 22, 2020 5:07 pm Just ran TF536 on my Mega ST.

Fixes/tweaks/upgrades done on my Mega:
I have IMP chip on both DMA and Shifter. Pullup fix on DMA. I have upgraded to 4Mb and they are 60ns. I have changed resistor arrays on databus (4.7k) and adressbus (3.3k). Running with a MeanWell RT-65B PSU. Using my newly made TOS256k decoder board and ROM adapter boards to run EmuTOS 0.9.12. ROMs are AT29C010A 90ns. Blitter is removed and deactivated.

Ran only with MAPROM.PRG in AUTO folder. Also set the flags on GemBench to run in ALT-RAM. Both program found on @agranlund github or site. Ran from floppy/gotek.
Hey DoG does your mouse work correctly and does your ASCI port work? I have pull-ups of 2.2k on address and data busses and Exxos V7 floppy upgrade that has the 10k pullups on the DMA buss. , I am also running stock 4Meg ram. The mouse sticks in the lower right hand corner of the screen, but with the Vofa card installed it works normally. The DMA port is still not working.
3)1040 stf/m, 2)Mega 4 ST, 1)STE, 1)Mega STE, 1)STacy, 2)Falcon 030
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DoG
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Re: Getting a TF536 working on my Mega ST.

Post by DoG »

Umberto1st wrote: Thu Jul 23, 2020 12:11 am Hey DoG does your mouse work correctly and does your ASCI port work? I have pull-ups of 2.2k on address and data busses and Exxos V7 floppy upgrade that has the 10k pullups on the DMA buss. , I am also running stock 4Meg ram. The mouse sticks in the lower right hand corner of the screen, but with the Vofa card installed it works normally. The DMA port is still not working.
Mouse works, not tested ACSI port with HDD yet.
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frank.lukas
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Re: Getting a TF536 working on my Mega ST.

Post by frank.lukas »

Testing File copy over IDE or ACSI by Kobold ...
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PhilC
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Re: Getting a TF536 working on my Mega ST.

Post by PhilC »

Happy to say I've had a good bit of sucess this evening.

I was using the excos r1.1 ide board as the rom and decoder board. I removed this and fitted exxos's rom decoder board with a socket soldered on top and a copy of tos2.06.

The TF536 now gets to desktop and the mouse works etc but bombs after about a minute. Next up is to try it with EmuTOS and different cpus just in case.

So far it looks like tbis Mega needs 100pf between CLK and GND and an extra 1k pullup on CLK as well.
15956240996278563403660520868084.jpg
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Re: Getting a TF536 working on my Mega ST.

Post by exxos »

PhilC wrote: Fri Jul 24, 2020 9:53 pm So far it looks like tbis Mega needs 100pf between CLK and GND and an extra 1k pullup on CLK as well.
Ditch the Mega for a H4, problem solved ;)

EDIT
Looks like you have the buffer board in there, have you tried the 8 MHz output clock from that instead ?
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: Getting a TF536 working on my Mega ST.

Post by PhilC »

@exxos no I haven't, what's the easiest way to connect that? I've only ever used the 16mhz out from it
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Re: Getting a TF536 working on my Mega ST.

Post by exxos »

PhilC wrote: Fri Jul 24, 2020 10:40 pm @exxos no I haven't, what's the easiest way to connect that? I've only ever used the 16mhz out from it
Should be 8Mhz out on one of the CN pins.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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