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Forum: Newbies Topic: W65C265S-Based Computer |
| BigEd |
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Posted: Sun Jan 10, 2021 11:22 am
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Replies: 57
Views: 7796
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| We know that Acorn's Tube protocol, or something very like it, can be sent over a parallel link (Torch's 6809) or over a serial link ... |
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Forum: Newbies Topic: W65C265S-Based Computer |
| cjs |
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Posted: Sun Jan 10, 2021 3:31 am
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Replies: 57
Views: 7796
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| ... an operation is obviously going to interferere with this. We know that Acorn's Tube protocol, or something very like it, can be sent over a parallel link (Torch's 6809) or ... |
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Forum: Newbies Topic: W65C265S-Based Computer |
| BigEd |
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Posted: Sat Jan 09, 2021 6:17 pm
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Replies: 57
Views: 7796
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| ... bytewide channel could be fine, with the right approach. We know that Acorn's Tube protocol, or something very like it, can be sent over a parallel link (Torch's 6809) or ... |
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Forum: Hardware Topic: W65C265 Peripheral Interface Bus and Acorn Tube® Interface |
| BigEd |
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Posted: Mon Dec 21, 2020 11:25 am
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Replies: 2
Views: 539
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| A single bidirectional byte channel is enough for the Tube, although it's not quite as efficient as Acorn's original chip, as the physical channel has to multiplex the four logical channels. But it's been done, over UART and over a pair of VIAs. So it might be that the 265 could support that. |
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Forum: Hardware Topic: W65C265 Peripheral Interface Bus and Acorn Tube® Interface |
| handyandy |
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Posted: Mon Dec 21, 2020 10:13 am
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Replies: 2
Views: 539
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| Unfortunately the PIB is unusable on the '265SXB board as some pins on port 4 and 5 are otherwise allocated. If the PIB were exposed it would mesh easily I think to an Apple II/IIGS expansion slot as another example. Also I believe the PIB could be delegated as a priority interrupt decoder. The low ... |
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Forum: Hardware Topic: W65C265 Peripheral Interface Bus and Acorn Tube® Interface |
| Sheep64 |
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Posted: Sat Dec 19, 2020 5:23 pm
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Replies: 2
Views: 539
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| ... , has four bi-directional 8 bit ports with striking similarity to Acorn's Tube Interface. There are a large number of quixotic devices which work at either end of a ... |
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Forum: Programming Topic: A way to relocate code |
| hoglet |
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Posted: Sat Sep 05, 2020 2:28 pm
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Replies: 24
Views: 3310
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| The later revisions of Acorn's OS for the BBC Micro series also had a scheme for relocation: ROM code is normally ... the corresponding byte needs correcting with a fixed offset when copied across the tube. Dave |
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Forum: Newbies Topic: A 65C02 can go faster, but what about the peripheral chips? |
| drogon |
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Posted: Wed Nov 27, 2019 9:21 am
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Replies: 6
Views: 1741
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| ... and so on - my idea is more like the "motherboard" being an Acorn style Tube 6502 (65816) 2nd processor to some sort of "host", or multiple hosts. The bus ... |
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Forum: Programmable Logic Topic: Using CPLD for very fine-grained memory mapping... |
| BigEd |
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Posted: Mon Sep 16, 2019 8:16 pm
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Replies: 15
Views: 2339
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| ... to leave a bit of room for more devices: another ACIA, another VIA, a Tube port, a second video adapter... More important, I would think, is to ... example, would seem to me an odd choice. (Might be worth noting that Acorn allowed 3 pages for I/O in the BBC Micro: one page for the various ... |
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Forum: General Discussions Topic: Semi-OT: "Stories-so-far" - an idea for sharing experiences |
| drogon |
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Posted: Sun Feb 17, 2019 7:29 pm
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Replies: 5
Views: 873
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| ... view in that it will (should) run most Beeb ROMs that use the standard Acorn MOS interface. This includes a filing system - when I finish it. However ... your code would run transparently in the BBC Micro or over the "Tube" in another, faster, 6502 plugged into it. And that's just the ... |
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Forum: Hardware Topic: Parallel co-processor interfacing (was: GPIB interface) |
| BigEd |
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Posted: Tue Jan 29, 2019 1:51 pm
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Replies: 30
Views: 5240
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| ... whole packet and do something useful with it. It might be notable that Acorn's Tube protocol has ordinary messages, unsolicited events, and also has full-steam no-flow-control ... |
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Forum: Hardware Topic: Parallel co-processor interfacing (was: GPIB interface) |
| BigEd |
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Posted: Tue Jan 29, 2019 10:00 am
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Replies: 30
Views: 5240
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| ... events, data transfers It may be that you can get some ideas from Acorn's Tube protocol , but it may be that what you want has different features and different priorities. ... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| BigEd |
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Posted: Tue Jan 29, 2019 9:58 am
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Replies: 12
Views: 9443
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Thanks, whartung, for taking your development/exploration thread over here for further discussion:
Edit: just added a note to the third post in the thread. |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| drogon |
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Posted: Mon Jan 28, 2019 10:45 pm
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Replies: 12
Views: 9443
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| My case is the opposite. In my scenario, the 65xx is the "co-processor" and the Pi is the Beeb -- the I/O processor. The roles are swapped. This is how my Ruby SBC works - although in the Mk 1, the IO processor is an ATmega. My own "roadmap" is that a Pi will be the IO processor... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| whartung |
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Posted: Mon Jan 28, 2019 10:34 pm
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Replies: 12
Views: 9443
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| ... that those constraints are compatible. I assume you are asking about Acorn's Tube implementation. The limiting factor is the 2MHz 6502 in the host (i.e. the Beeb). The ... |
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