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viewtopic.php?t=7286
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DMA ISSUE ON H4
Re: DMA ISSUE ON H4
HDCS was used on the H4... The PCB breaks that line and from FDCS goes via the inverter to the 245 instead.. Its pretty simple.
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rubber_jonnie
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- Location: Essex
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Re: DMA ISSUE ON H4
@Icky Awesome, thanks. Inverter is on order so I'll hopefully be able to get this done soon, though I am away for a few days from Sunday, so I may have to wait until the following weekend.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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rubber_jonnie
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- Joined: Thu Aug 17, 2017 7:40 pm
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Re: DMA ISSUE ON H4
@exxos Cool thanks, looks like I understood it correctlyexxos wrote: Wed Mar 11, 2020 11:43 pm HDCS was used on the H4... The PCB breaks that line and from FDCS goes via the inverter to the 245 instead.. Its pretty simple.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: DMA ISSUE ON H4
Got an email from osh saying the dma fix boards they shipped me are defective and new ones will be shipped soon err.
Tom
Tom
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rubber_jonnie
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Re: DMA ISSUE ON H4
Hoping my inverters will be there when I get home later today. I decided not to order pcbs for the DMA fix in the end, as apart from the inverters I have enough proto board around to make them. I guess we'll see later.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: DMA ISSUE ON H4
:/
Got the patch board from exxos of course, but the 74LVC1G04 isn't in the BOM and I don't have one at hand.
I should've read up on all the threads before ordering the components.
/Troed
Got the patch board from exxos of course, but the 74LVC1G04 isn't in the BOM and I don't have one at hand.
I should've read up on all the threads before ordering the components.
/Troed
Re: DMA ISSUE ON H4
@troed yeah I did the same but it gave me an excuse to order more goodies at the same time as the 04.
If it ain't broke, test it to Destruction.
Re: DMA ISSUE ON H4
Good job you mentioned it...need to add 2x of those to my next order as well...troed wrote: Thu Jun 11, 2020 9:57 pm Got the patch board from exxos of course, but the 74LVC1G04 isn't in the BOM and I don't have one at hand.
I should've read up on all the threads before ordering the components.
/Troed
Re: DMA ISSUE ON H4
Does anybody have a spare fix board by any chance? DoG was able to help me out for the first board but since I'm about to finish another one, I'd like to have a clean install and tought somebody might have an extra. I'll cover the costs (i'm in the UK) but rather not wait for a new batch of pcbs just for 1.
Let me know, thanks.
Let me know, thanks.
Re: DMA ISSUE ON H4
@Robson - I have one with the SMT chip already installed. PM me 