WANTED: Acorn Electron ROM chip

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arkadiusz.makarenko
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WANTED: Acorn Electron ROM chip

Post by arkadiusz.makarenko » Sun Nov 21, 2021 9:28 pm

I have elk with flaky rom chip, I know it is very long shot, but does maybe have spare/dead elk which would want to break for parts by any chance?
Technically it should be possible just to use 27c256, but neither M27c256 not M27c512 work as expected (init section passes, but when BASIC loads it crashes elk). I suspect some kind of timing issue. with ST chips.
I have ordered AMD and Hitachi 27c256, maybe this would solve the issue, but if by any chance someone had original chip this would work 100%.
Do not trust people. They are capable of greatness.
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arkadiusz.makarenko
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Re: WANTED: Acorn Electron ROM chip

Post by arkadiusz.makarenko » Mon Nov 22, 2021 8:44 am

I got offered replacement chip by daveejhitchins from stardot forum. So I will need to just clean this elk and it will be ready to use again. Time to spend some time playing Citadel again.
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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rubber_jonnie
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Re: WANTED: Acorn Electron ROM chip

Post by rubber_jonnie » Mon Nov 22, 2021 9:07 am

arkadiusz.makarenko wrote:
Mon Nov 22, 2021 8:44 am
I got offered replacement chip by daveejhitchins from stardot forum. So I will need to just clean this elk and it will be ready to use again. Time to spend some time playing Citadel again.
Dave is mega helpful, he's been trying to help me get my ULA replacement board built, but the lack of CPLD has proved a bit of an obstacle!
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...

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arkadiusz.makarenko
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Re: WANTED: Acorn Electron ROM chip

Post by arkadiusz.makarenko » Mon Nov 22, 2021 10:28 am

rubber_jonnie wrote:
Mon Nov 22, 2021 9:07 am
arkadiusz.makarenko wrote:
Mon Nov 22, 2021 8:44 am
I got offered replacement chip by daveejhitchins from stardot forum. So I will need to just clean this elk and it will be ready to use again. Time to spend some time playing Citadel again.
Dave is mega helpful, he's been trying to help me get my ULA replacement board built, but the lack of CPLD has proved a bit of an obstacle!
Is there ULA replacement projekt? Is it open source?
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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rubber_jonnie
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Re: WANTED: Acorn Electron ROM chip

Post by rubber_jonnie » Mon Nov 22, 2021 10:33 am

arkadiusz.makarenko wrote:
Mon Nov 22, 2021 10:28 am
rubber_jonnie wrote:
Mon Nov 22, 2021 9:07 am


Dave is mega helpful, he's been trying to help me get my ULA replacement board built, but the lack of CPLD has proved a bit of an obstacle!
Is there ULA replacement projekt? Is it open source?
I believe it is open source, but I managed to get a PCB from Dave a while back, but just can't find the chip I need due to the shortages. Let me see if I can find the link for you, I think it's on GitHub.
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...

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rubber_jonnie
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Re: WANTED: Acorn Electron ROM chip

Post by rubber_jonnie » Mon Nov 22, 2021 10:36 am

@arkadiusz.makarenko

Here you go: https://github.com/EquasysIT/ElectronULA
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...

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arkadiusz.makarenko
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Re: WANTED: Acorn Electron ROM chip

Post by arkadiusz.makarenko » Mon Nov 22, 2021 12:04 pm

rubber_jonnie wrote:
Mon Nov 22, 2021 10:36 am
@arkadiusz.makarenko

Here you go: https://github.com/EquasysIT/ElectronULA
Nice project
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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rubber_jonnie
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Re: WANTED: Acorn Electron ROM chip

Post by rubber_jonnie » Mon Nov 22, 2021 1:39 pm

arkadiusz.makarenko wrote:
Mon Nov 22, 2021 12:04 pm
rubber_jonnie wrote:
Mon Nov 22, 2021 10:36 am
@arkadiusz.makarenko

Here you go: https://github.com/EquasysIT/ElectronULA
Nice project
Would be great if I could get the parts.
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...

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arkadiusz.makarenko
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Posts: 1119
Joined: Wed Jun 19, 2019 7:36 am
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Re: WANTED: Acorn Electron ROM chip

Post by arkadiusz.makarenko » Mon Nov 22, 2021 5:36 pm

rubber_jonnie wrote:
Mon Nov 22, 2021 1:39 pm
arkadiusz.makarenko wrote:
Mon Nov 22, 2021 12:04 pm


Nice project
Would be great if I could get the parts.
Sooner or later this madness will end.
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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rubber_jonnie
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Re: WANTED: Acorn Electron ROM chip

Post by rubber_jonnie » Mon Nov 22, 2021 6:44 pm

arkadiusz.makarenko wrote:
Mon Nov 22, 2021 5:36 pm
rubber_jonnie wrote:
Mon Nov 22, 2021 1:39 pm


Would be great if I could get the parts.
Sooner or later this madness will end.
I do hope so!
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...

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