Andres' H5 B1 Build

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AndresPlazaR
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Re: Andres' H5 B1 Build

Post by AndresPlazaR »

exxos wrote: Fri Mar 05, 2021 11:04 pm Did you program the GAL yourself ? Either its not programmed correctly, or faulty GAL by the sounds of it.
Well, definitely is not programmed, because I did not know that it needed to... And also don't know how to. :-)

Any instructions around?
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exxos
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Re: Andres' H5 B1 Build

Post by exxos »

You need a gal programmer ... Then read the manual on how to use it...
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Re: Andres' H5 B1 Build

Post by AndresPlazaR »

exxos wrote: Sat Mar 06, 2021 2:09 am You need a gal programmer ... Then read the manual on how to use it...
OK, I found out that the TL866+ I have can program GAL (in particular the 22V10D). And using minipro on Linux, I can detect it:

Code: Select all

Name: GAL22V10D
Memory: 5892 Bits
Package: DIP24
ICSP: -
Protocol: 0x2c
Read buffer size: 0 Bytes
Write buffer size: 0 Bytes
*******************************
VPP programming voltage: 16V
I just found this article: https://www.exxosforum.co.uk/forum/viewt ... ing#p33807

So: @exxos or @Icky, could I have the code to program the GAL, please? :-D
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Re: Andres' H5 B1 Build

Post by Icky »

@AndresPlazaR - have PM'ed you.
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Re: Andres' H5 B1 Build

Post by AndresPlazaR »

Icky wrote: Sat Mar 06, 2021 6:27 am @AndresPlazaR - have PM'ed you.
Thank you very much!
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Re: Andres' H5 B1 Build

Post by AndresPlazaR »

So, after programming the GAL (thanks @exxos, @Icky and @kodak80), pin 14 in the GAL does output 8MHz:
pic_42_1.jpg
pic_42_1.jpg (82.11 KiB) Viewed 3204 times
But, floppy in 720k mode did not work.

Then, I connected pin 2 of the Gotek to the bottom pin of JP18 (as suggested in https://www.exxosforum.co.uk/forum/viewt ... ing#p33807 ), but also did not work.

(with "did not work", in all cases, I mean the drive does not make seek sounds and, when trying to open the drive in TOS 2.06, I get the message "Data on the disk in drive A: may be damaged.")

I just wanted to verify something: @kodak80, reading your post mentioned above, in the section about automating the selection of 720 or 1.44 modes, it says:
JP22 has pins 2 and 3 connected so that the 1.44mb IC controls the clock speed to the WD1772.
Are the pins in JP22 different in the H4 board than the H5? Because in the label of the H5 B1 board, it says pins 2&3 are for "8MHz 1772" and 1&2 are for "8MHz & 16 MHz GAL mode". So, it seems to be opposite of what's described in the post, right?

In any case, I tried JP22 in both 1&2 and 2&3, and the Gotek still does not work.
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Re: Andres' H5 B1 Build

Post by exxos »

Jp22 if you check has 8mhz on one side, so that and the middle pin simply feeds 8mhz to the 1772... So the GAL does nothing... If its not working with 720k, then you have some other problem...

BTW I cannot remember offhand if the 1k series resistors were swapped to 500R on the B1 or not.. So might be worth checking...
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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Re: Andres' H5 B1 Build

Post by AndresPlazaR »

exxos wrote: Sat Mar 06, 2021 7:31 pm BTW I cannot remember offhand if the 1k series resistors were swapped to 500R on the B1 or not.. So might be worth checking...
I just measured RN1, RN2, RN15, RN16 and RN17 in the H5 B1, and they are 1 kOhm.

I will keep looking, and report back if I find anything.

If anyone has ideas, let me know. :-)
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Re: Andres' H5 B1 Build

Post by exxos »

2 single resistors next to the 1772...
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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Re: Andres' H5 B1 Build

Post by AndresPlazaR »

exxos wrote: Sat Mar 06, 2021 9:10 pm 2 single resistors next to the 1772...
Oh!

R21 and R22 measure 470 Ohms (and, at least in the schematics I have for the H5A, they are spec as 470 Ohms).
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