New Pegasus Disc Interface Layout
- daveejhitchins
- Posts: 7878
- Joined: Wed Jun 13, 2012 6:23 pm
- Location: Newton Aycliffe, County Durham
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New Pegasus Disc Interface Layout
With an Altium export of his bygonedays (Derek) Pegasus layout, I've carried out a few changes and created a revised layout.
Changes:
Added more capacitors.
Made more space around the bottom right-hand fixing hole.
Rejigged the SRAM socket for 62256 parts.
Replaced the 7416 with a ULN2003A as the 7416 is hard to find at a reasonable price.
Added extra ground.
Tidied-up the layout.
Dave H
Changes:
Added more capacitors.
Made more space around the bottom right-hand fixing hole.
Rejigged the SRAM socket for 62256 parts.
Replaced the 7416 with a ULN2003A as the 7416 is hard to find at a reasonable price.
Added extra ground.
Tidied-up the layout.
Dave H
Available: ARA II : ARA III-JR/PR : ABR : AP5 : AP6 : ABE : ATI : MGC : Plus 1 Support ROM : Plus 3 2nd DA : Prime's Plus 3 ROM/RAM : Pegasus 400 : Prime's MRB : ARCIN32 : Cross-32
Re: New Pegasus Disc Interface Layout
Nice work Dave
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- walkerworks
- Posts: 189
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Re: New Pegasus Disc Interface Layout
Nice job, I was concerned the export from EasyEda would cause some problems but it's looking really good
Re: New Pegasus Disc Interface Layout
That’s a definite plus, after taking mine apart twice and fighting to put it back in the case.daveejhitchins wrote: ↑Sun Apr 11, 2021 2:50 pm Made more space around the bottom right-hand fixing hole.
Richard B
Acorn Electrons issue 4 and 6, MRB, Plus 1 x2, Plus 3, AP6 x2, AP5, Pegasus 400, BeebSCSI, Gotek, Raspberry Pi Co-processor, GoSDC MBE.
BBC B+ 64K (128K upgraded) with Duel OS, Raspberry Pi Co-processor and Gotek.
Acorn Electrons issue 4 and 6, MRB, Plus 1 x2, Plus 3, AP6 x2, AP5, Pegasus 400, BeebSCSI, Gotek, Raspberry Pi Co-processor, GoSDC MBE.
BBC B+ 64K (128K upgraded) with Duel OS, Raspberry Pi Co-processor and Gotek.
Re: New Pegasus Disc Interface Layout
Added into the hardware list.
Re: New Pegasus Disc Interface Layout
I made my original Pegasus PCB fit in the case properly by draw-filing the edges of the PCB.
The right hand edge of the board has a thick track which mustn't come into contact with the case.
Socketing the LS04 makes it possible to put the nut over the hole and do the screw up so that the nut doesn't need to rotate round.
The right hand edge of the board has a thick track which mustn't come into contact with the case.
Socketing the LS04 makes it possible to put the nut over the hole and do the screw up so that the nut doesn't need to rotate round.
- daveejhitchins
- Posts: 7878
- Joined: Wed Jun 13, 2012 6:23 pm
- Location: Newton Aycliffe, County Durham
- Contact:
Re: New Pegasus Disc Interface Layout
Yes, that bottom right hole was "a bit tight" to say the least. I had to write detailed instructions for users purchasing cases.sP1d3r wrote: ↑Fri May 07, 2021 11:50 am I made my original Pegasus PCB fit in the case properly by draw-filing the edges of the PCB.
The right hand edge of the board has a thick track which mustn't come into contact with the case.
Socketing the LS04 makes it possible to put the nut over the hole and do the screw up so that the nut doesn't need to rotate round.
I don't think I've ever seen that version of the Pegasus in one of Slogger's cases - just wondering how it was done! Maybe the PCB was respinned?
Dave H.
Available: ARA II : ARA III-JR/PR : ABR : AP5 : AP6 : ABE : ATI : MGC : Plus 1 Support ROM : Plus 3 2nd DA : Prime's Plus 3 ROM/RAM : Pegasus 400 : Prime's MRB : ARCIN32 : Cross-32
Re: New Pegasus Disc Interface Layout
Here's a picture.
Draw filing is using the file perpendicular to the edge instead of filing as usual and it's more accurate if you're careful.
Draw filing is using the file perpendicular to the edge instead of filing as usual and it's more accurate if you're careful.
Re: New Pegasus Disc Interface Layout
Actually Dave, I think because of the amount of faulty via's that had to be fixed, the PCB may have gone to a different manufacturer for production with some modifications as noted on the Issue B version of the schematic diagram I've seen on the forum.
I'd say 60-70% of the via's needed a wire soldered in, I didn't mind that because prior to my taking up repairing old computers in the last few years, the last soldering/electronics I did was around the time I was studying for an OND BITD which much to my disappointment I was unable to complete.
No time like the present to try to catchup!
I'd say 60-70% of the via's needed a wire soldered in, I didn't mind that because prior to my taking up repairing old computers in the last few years, the last soldering/electronics I did was around the time I was studying for an OND BITD which much to my disappointment I was unable to complete.
No time like the present to try to catchup!
- daveejhitchins
- Posts: 7878
- Joined: Wed Jun 13, 2012 6:23 pm
- Location: Newton Aycliffe, County Durham
- Contact:
Re: New Pegasus Disc Interface Layout
They could also have been prototypes! I still have several that have "some" components on them and are slightly different layouts (and are a mess!) - If anyone wants some troubleshooting practice, just PM me.sP1d3r wrote: ↑Mon May 10, 2021 4:34 pm Actually Dave, I think because of the amount of faulty via's that had to be fixed, the PCB may have gone to a different manufacturer for production with some modifications as noted on the Issue B version of the schematic diagram I've seen on the forum.
I'd say 60-70% of the via's needed a wire soldered in, I didn't mind that because prior to my taking up repairing old computers in the last few years, the last soldering/electronics I did was around the time I was studying for an OND BITD which much to my disappointment I was unable to complete.
No time like the present to try to catchup!
Dave H.
Available: ARA II : ARA III-JR/PR : ABR : AP5 : AP6 : ABE : ATI : MGC : Plus 1 Support ROM : Plus 3 2nd DA : Prime's Plus 3 ROM/RAM : Pegasus 400 : Prime's MRB : ARCIN32 : Cross-32
Re: New Pegasus Disc Interface Layout
Hi!daveejhitchins wrote: ↑Mon May 10, 2021 5:39 pmThey could also have been prototypes! I still have several that have "some" components on them and are slightly different layouts (and are a mess!) - If anyone wants some troubleshooting practice, just PM me.sP1d3r wrote: ↑Mon May 10, 2021 4:34 pm Actually Dave, I think because of the amount of faulty via's that had to be fixed, the PCB may have gone to a different manufacturer for production with some modifications as noted on the Issue B version of the schematic diagram I've seen on the forum.
I'd say 60-70% of the via's needed a wire soldered in, I didn't mind that because prior to my taking up repairing old computers in the last few years, the last soldering/electronics I did was around the time I was studying for an OND BITD which much to my disappointment I was unable to complete.
No time like the present to try to catchup!
Dave H.
Is by any chance available the Pegasus gerber files?
- daveejhitchins
- Posts: 7878
- Joined: Wed Jun 13, 2012 6:23 pm
- Location: Newton Aycliffe, County Durham
- Contact:
Re: New Pegasus Disc Interface Layout
Here's the latest Manufacturing Pack:
If you want the Altium files or the case .stl files, let me know!
Dave H.
Edit: Edit:
Note: If you have an earlier Pegasus the board mounting holes will not be in the right place!
If you want the Altium files or the case .stl files, let me know!
Dave H.
Edit: Edit:
Note: If you have an earlier Pegasus the board mounting holes will not be in the right place!
Last edited by daveejhitchins on Wed May 01, 2024 5:27 pm, edited 1 time in total.
Available: ARA II : ARA III-JR/PR : ABR : AP5 : AP6 : ABE : ATI : MGC : Plus 1 Support ROM : Plus 3 2nd DA : Prime's Plus 3 ROM/RAM : Pegasus 400 : Prime's MRB : ARCIN32 : Cross-32
Re: New Pegasus Disc Interface Layout
Thank you Dave!