Tom's attempt at the h4

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Tomswork
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Tom's attempt at the h4

Post by Tomswork »

Well I ordered two h4 boards and going through my parts bins found some C100281 32 MHZ 32.04245 from some Atari machines I am hoping the will work with the us tos
Also found some apple 72pin 4mb 8 chips 70ns memory

And I have two doner 520st and a 520stfm maybe working.

Would like to know if anyone has the dma fix board extra out there for sale. And what code or jed file is there for the 1.44 mb fd

Thank you
Tom
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Icky
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Re: Tom's attempt at the h4

Post by Icky »

Tomswork wrote: Wed Feb 19, 2020 7:26 am Well I ordered two h4 boards and going through my parts bins found some C100281 32 MHZ 32.04245 from some Atari machines I am hoping the will work with the us tos
Also found some apple 72pin 4mb 8 chips 70ns memory
Welcome to the club @Tomswork
Tomswork wrote: Wed Feb 19, 2020 7:26 am Would like to know if anyone has the dma fix board extra out there for sale. And what code or jed file is there for the 1.44 mb fd
We have some H4 DMA fix boards in the pipeline with the PCB fab not sure when we will get them back as they are backed up due to the restrictions of manufacturing in China at the moment. Once you get to the point of doing the HD Floppy addition on your H4's then PM @exxos or myself.
Tomswork
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Re: Tom's attempt at the h4

Post by Tomswork »

Thank Icky I will keep an eye on the posts


Tom
Tomswork
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Re: Tom's attempt at the h4

Post by Tomswork »

Well got my h4 boards today started looking through my parts bins will start shortly

Tom
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PaulJ
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Re: Tom's attempt at the h4

Post by PaulJ »

Icky wrote: Wed Feb 19, 2020 10:36 am
Tomswork wrote: Wed Feb 19, 2020 7:26 am Well I ordered two h4 boards and going through my parts bins found some C100281 32 MHZ 32.04245 from some Atari machines I am hoping the will work with the us tos
Also found some apple 72pin 4mb 8 chips 70ns memory
Welcome to the club @Tomswork
Tomswork wrote: Wed Feb 19, 2020 7:26 am Would like to know if anyone has the dma fix board extra out there for sale. And what code or jed file is there for the 1.44 mb fd
We have some H4 DMA fix boards in the pipeline with the PCB fab not sure when we will get them back as they are backed up due to the restrictions of manufacturing in China at the moment. Once you get to the point of doing the HD Floppy addition on your H4's then PM @exxos or myself.
@Icky still waiting on my gals. Do you need the bogie adaptor board for 1.44 to work? I'm assuming the jumpers will work but please verify.
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DoG
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Re: Tom's attempt at the h4

Post by DoG »

PaulJ wrote: Tue Feb 25, 2020 3:00 pm @Icky still waiting on my gals. Do you need the bogie adaptor board for 1.44 to work? I'm assuming the jumpers will work but please verify.
Just the GAL22V10 is needed and two extra jumpers. If you have a programmer, Icky and exxos have the JED file for the GAL. Or did Icky sent you one over snail mail?

The small board with the 1-channel inverter and the buffer chip is only for the HDD. The floppy drive buffer chip (SN74LS245) does not need a fix.
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PaulJ
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Re: Tom's attempt at the h4

Post by PaulJ »

Just waiting on my gals... thought I had some for another project but couldn't find them to save my life. Now that my new order should arrive tomorrow I'll be able to find the ones that are missing. :dizzy:
Tomswork
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Re: Tom's attempt at the h4

Post by Tomswork »

I have the gal on order 22v10c. I will need the jed file so I can pass on the pcb I guesss. I'm still digging I'm my shop supply's but I do have a programmer somewhere

Tom
Tomswork
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Re: Tom's attempt at the h4

Post by Tomswork »

Made some progress before work my tl866 ii will program the gal. This is for the 1.44 floppy. now about the pcb board for the dma. This mod is needed to use the internal and external asci ports I'm thinking. I plan to use a ultrasatan and a acsi to scsi board with a scsisdv6
Any advice on this setup so far


Tom
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exxos
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Re: Tom's attempt at the h4

Post by exxos »

You need to mod for any DMA connectors.
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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