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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| BigEd |
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Posted: Mon Jan 28, 2019 10:26 pm
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Replies: 12
Views: 9443
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| whartung |
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Posted: Mon Jan 28, 2019 10:21 pm
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Replies: 12
Views: 9443
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| But I'm not sure about your idea that PiTubeDirect is the wrong direction: the Beeb is a 6502 machine, and the Pi is a Pi. ... of (to me) complicated hardware, and it's not clear to me how those would work. Acorn's original Tube chip is a collection of 8 FIFOs, with some slightly subtle ... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| hoglet |
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Posted: Mon Jan 28, 2019 10:11 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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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| BigEd |
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Posted: Mon Jan 28, 2019 8:49 pm
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Replies: 12
Views: 9443
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| Chromatix |
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Posted: Mon Jan 28, 2019 7:19 pm
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Replies: 12
Views: 9443
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| ... to transfer 256 bytes? How much latency is acceptable in the character interface? You may well find that those constraints are compatible. The Tube is actually a set of *eight* FIFOs, some deeper than others, each with its own status flags and interrupt masks IIRC. I think each side is capable ... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| BigEd |
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Posted: Mon Jan 28, 2019 6:54 pm
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Replies: 12
Views: 9443
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| ... interfacing thread.) But I'm not sure about your idea that PiTubeDirect is the wrong direction: the Beeb is a 6502 machine, and the Pi ... I/O mechanism. In which case yes, this is something like the opposite. Acorn's original Tube chip is a collection of 8 FIFOs, with some slightly ... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| whartung |
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Posted: Mon Jan 28, 2019 6:45 pm
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Replies: 12
Views: 9443
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| I tried reading the documentation of the tube from some Acorn docs, and it was pretty dense. The PiTube direct project isn't much help to me, as I'm more curious ... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| BigEd |
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Posted: Mon Jan 28, 2019 11:50 am
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Replies: 12
Views: 9443
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| Just to cross-link to a related thread: Acorn's BBC micro - some resources and another, over on StarDot: Acorn's Second Processors and the Tube - what, and why Edit: just to add a note, that while the normal use of Acorn's Tube is to join ... |
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Forum: Newbies Topic: 65XX SBC general help and color display help needed |
| drogon |
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Posted: Mon Jan 28, 2019 11:37 am
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Replies: 429
Views: 22444
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| ... suffered from our usual lack of marketing ability. It was designed by Acorn for in conjunction with a BBC TV series aimed at improving computing ... at the time (and several now) One of the key interfaces was the "Tube" - a 2Mhz bus used for connecting a 2nd processor - 65c102, Z80, ... |
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Forum: General Discussions Topic: Ye olde Mandelbrot... |
| Chromatix |
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Posted: Tue Jan 08, 2019 12:00 am
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Replies: 13
Views: 3228
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| ... leaves more RAM available for use. It relies on the presence of the Acorn MOS API, whose entry points are in the $FFxx space just below the interrupt ... this API in 2KB, though most of the calls are just passed across the Tube to the full MOS ROM running on the host micro. There's some guidance ... |
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Forum: Hardware Topic: Serial bootstrap |
| Chromatix |
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Posted: Fri Dec 21, 2018 9:04 pm
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Replies: 40
Views: 6222
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| One option for the memory map would be to look closely at the Acorn Second Processor modules, which could be hung off the side of a BBC Micro using an interface called the "Tube". The idea was that the BBC Micro would handle the graphics, keyboard, disks ... |
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Forum: Hardware Topic: Parallel co-processor interfacing (was: GPIB interface) |
| BigEd |
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Posted: Mon Nov 19, 2018 8:49 am
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Replies: 30
Views: 5240
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| The Tube is electrically very simple, but the protocol is a little complex, and the implementation ... Back in the day, there was at least one nearly-Tube implementation which didn't use Acorn's custom chip, but a pair of back-to-back VIAs (or PIAs) - a couple of 8 bit ports is ... |
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Forum: Hardware Topic: Parallel co-processor interfacing (was: GPIB interface) |
| drogon |
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Posted: Mon Nov 19, 2018 7:47 am
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Replies: 30
Views: 5240
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| Somebody else would know much more about this than I do, but isn't the Acorn tube interface a solution to exactly this problem. I do know that the tube interface has been ... |
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Forum: Hardware Topic: Parallel co-processor interfacing (was: GPIB interface) |
| jds |
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Posted: Mon Nov 19, 2018 2:54 am
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Replies: 30
Views: 5240
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| Somebody else would know much more about this than I do, but isn't the Acorn tube interface a solution to exactly this problem. I do know that the tube interface has been implemented on both a 6502 and a Pi so there should even be existing hardware and software to do this. |
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Forum: Programmable Logic Topic: cpu65c02_tc release candidate is available on request |
| hoglet |
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Posted: Mon Aug 20, 2018 11:37 am
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Replies: 20
Views: 7824
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| Hi all, A long time ago , when using Jens' 65C02 core in an Acorn 65C02 FPGA Co Processor, we discovered that Tube Elite would crash when F6 was pressed (to see the data on the current planet). At the weekend, ... |
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