Tom's attempt at the h4

[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

[Icky]

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

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]

Thank Icky I will keep an eye on the posts


Tom

[Tomswork]

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

Tom

[PaulJ]

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

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.

[DoG]

@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.

[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]

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]

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

[exxos]

You need to mod for any DMA connectors.