New Raspberry Pi to 1MHz bus interface

discuss both original and modern hardware for the bbc micro/electron
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KenLowe
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Re: New Raspberry Pi to 1MHz bus interface

Post by KenLowe » Sat Apr 18, 2020 12:37 am

BigEd wrote:
Fri Apr 17, 2020 9:33 pm
Ah, I think this was the hazard: trying to approximate a male-to-female extension by combining a male-to-male with a female-to-female will end in disaster.
The small boards I was thinking about building were specifically to address that issue. The boards were going to do the appropriate pin translation. I may still make some, as they shouldn't be very expensive if I combine them with an order for some more Tube level shifters which I'm probably going to have to do shortly.

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Wheel_nut
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Re: New Raspberry Pi to 1MHz bus interface

Post by Wheel_nut » Sat Apr 18, 2020 1:49 am

I bought some of these to make a 40 Pin Tube extender for my RPi 1B to sit in the Connector well but ended up using Ken's two Header extension instead. They are similar to Hoglets RS ones but have the Retainer/ Ejector Clips.
40Pin Cable Socket.jpg
#1 BBC Model B Issue 7 + 1770 DFS + Dual TEAC Floppy
#2 BBC Model B Issue 7 + 8271 DFS + Dual Floppy + Speech + PiTubeDirect on KenLowe's Tube Level Shifter
#3 BBC Model B Issue 7 + 8271 DFS + Cumana Single Floppy

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KenLowe
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Re: New Raspberry Pi to 1MHz bus interface

Post by KenLowe » Sat Apr 18, 2020 10:02 am

Please be aware that I am now out of stock on the Tube level shifters. I have sufficient stock to cover all current notes of interest, but will need to order up another batch of boards for anyone else who notes interest. I'll advise when these get delivered to me. I still have plenty of 1MHz level shifters if anyone else is interested.

mph1708
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Re: New Raspberry Pi to 1MHz bus interface

Post by mph1708 » Sat Apr 18, 2020 1:47 pm

dp11 wrote
As you can preload the RAM from a file I was wondering if something like bad apple can be ported as you have 480Mbytes of ram to play with.
Bad Apple can be run from Ramdisc (Retroclinic RAMFS) if you use the built in *DTRAP function.
Load to Ramdisc 0 & Ramdisc 2 from DFS Drive 0 & Drive 2 using RCOPY utility. (*RCOPY D0R0 & *RCOPY D2R2)

cr12925
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Re: New Raspberry Pi to 1MHz bus interface

Post by cr12925 » Tue Apr 28, 2020 9:01 pm

KenLowe wrote:
Sat Apr 18, 2020 10:02 am
I still have plenty of 1MHz level shifters if anyone else is interested.
Please can I buy one of these from you? (How much are they - sorry - I've probably missed an earlier post!)

if you can PM me we can sort it all out no doubt.

Thanks.

C.
Master 128, Viglen floppy drives, former purveyor of BBS software...

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KenLowe
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Re: New Raspberry Pi to 1MHz bus interface

Post by KenLowe » Wed Apr 29, 2020 12:25 am

cr12925 wrote:
Tue Apr 28, 2020 9:01 pm
KenLowe wrote:
Sat Apr 18, 2020 10:02 am
I still have plenty of 1MHz level shifters if anyone else is interested.
Please can I buy one of these from you? (How much are they - sorry - I've probably missed an earlier post!)

if you can PM me we can sort it all out no doubt.

Thanks.

C.
PM sent.

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tricky
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Re: New Raspberry Pi to 1MHz bus interface

Post by tricky » Wed Apr 29, 2020 12:48 pm

Has anyone tried to run DOOM on this combo yet?

Does anyone think that using a PI-zero-W to wirelessly update an ADF SCSI image on the 1MHz PI would be feasible - bare metal 'n all.

dp11
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Re: New Raspberry Pi to 1MHz bus interface

Post by dp11 » Wed Apr 29, 2020 12:52 pm

In theory Wifi might be possible. The problem is finding a clean bare metal Wifi stack .

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KenLowe
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Re: New Raspberry Pi to 1MHz bus interface

Post by KenLowe » Thu May 07, 2020 11:13 pm

The For Sale forum is open for posting again, so if interested in purchasing a board, please make a post in my For Sale thread.

aotta
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Re: New Raspberry Pi to 1MHz bus interface

Post by aotta » Sat May 09, 2020 11:06 am

i'm playing a bit with the 1Mhz interface and it's software, for testing its RAM support, but i can't find the (newbye) info i'm looking for..
i can use the RAM: disc with ramfs120 ROM, and i'd like to use a tool like the MMFS's IMTOD to copy SSD into RAM (or, better, like the *import command available with datacentre), but it seems OSCALL &7F doesn't work for RAM drive 0, and i got a write error with the IMTOD version i modded ..
And, for using the Page mode instead of the byte mode, is needed a specific RAMFS ROM?
Thanks in advance for any info!

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KenLowe
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Re: New Raspberry Pi to 1MHz bus interface

Post by KenLowe » Sat May 09, 2020 12:21 pm

Sorry, but I'm not going to be able to offer any help with that query as I've not had much experience with using the RAM disk functionality either. Hopefully there are others that can chime in here.

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