| Author |
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Forum: Newbies Topic: Clock circuit for NMOS 6502 - Gate Delay on Phi2? |
| kazzie |
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Posted: Tue Jul 24, 2018 2:58 pm
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Replies: 22
Views: 6458
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| ... level of detail, it seems.) An interesting find: I hadn't looked at the Acorn Atom's clock. The Atom is of course, based on the System 2, which is ... port ULA, a few 74xx ICs, AND is left hanging off the bus of the "tube" expansion port. On balance, I'm leaning towards saying that the ... |
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Forum: Hardware Topic: Shadowing ROM into RAM? |
| Chromatix |
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Posted: Fri May 25, 2018 5:54 pm
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Replies: 20
Views: 9046
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| You may want to look at how the Acorn 6502 Second Processor did it. It came up with a heavily divided clock speed to ... 2KB ROM, which was mapped at the very top of the memory map, overlaying the Tube I/O and some of the RAM. The control signal selecting this clock speed directed ... |
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Forum: Newbies Topic: BASIC with character LCD |
| BigEd |
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Posted: Fri May 25, 2018 3:56 pm
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Replies: 50
Views: 50445
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| ... few people have found a need to plug and unplug a connector onto their Acorn's Tube port a couple of dozen times before it comes reliable. Now, those ports will be well over ... |
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Forum: General Discussions Topic: Introduce yourself |
| Chromatix |
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Posted: Mon May 21, 2018 9:36 pm
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Replies: 680
Views: 320001
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| ... of them. We also had an Amstrad PCW, a ZX Spectrum +3 and, later, an Acorn RiscPC - but for me, the BBC Micro epitomised what an 8-bit micro *should* ... myself converting lib6502 to C++ as part of trying to get a BBC Master+Tube emulator going. I found quite a few bugs in the process, many of ... |
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Forum: General Discussions Topic: Photos from ABUG meetup near Leicester (UK) |
| BigEd |
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Posted: Tue Nov 21, 2017 4:44 pm
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Replies: 0
Views: 4881
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| ... making progress. The most numerous machines there, I think, were the Acorn BBC Micros and their successor the Master, but also there were the ... the repertoire of second processors (co-processors) connected over the Tube - solid state storage projects to replace SCSI, floppy, IDE, ROMs - ... |
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Forum: Hardware Topic: 6502 multiprocessing and Acorn's Tube |
| BigEd |
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Posted: Sun Apr 02, 2017 6:23 pm
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Replies: 12
Views: 9443
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| ... is ready for an update or two! Our own efforts at an HDL model of the Tube chip have been superseded by others: this one for example: https://github.com/hoglet67/CoPro6502/tree/master/src/Tube ... it's worth linking to a definitive (though incomplete) reference from Acorn themselves, in the form ... |
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Forum: Nostalgia Topic: Acorn's BBC micro - some resources |
| BigEd |
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Posted: Sat Mar 11, 2017 10:37 am
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Replies: 12
Views: 18360
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| Might be worth adding some comparisons of Acorn's 6502 computer offerings, using the Beeb as a baseline, as a kind of buyer's ... port and expansion bus, but lacks many of the Beeb's I/O devices including the Tube and the Printer, Serial and User Ports. Uses nibble-wide RAM which limits performance, ... |
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Forum: Programming Topic: WFDis - 6502/65C02 interactive disassembler |
| BigEd |
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Posted: Mon Feb 13, 2017 9:15 am
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Replies: 66
Views: 17720
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| ... nice to be able to toggle that, and supply a load address manually for Acorn-style binaries, or ROM dumps. I loaded TUBE from this site http://mdfs.net/Software/Tube/BBC/ and all I'm getting is a hex dump - ... |
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Forum: Hardware Topic: Matchbox copro now at 64MHz and with 1MByte RAM |
| BigEd |
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Posted: Fri Nov 11, 2016 8:54 am
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Replies: 0
Views: 4356
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| ... 256 byte page of I/O, and 64k of RAM, which is the normal map for an Acorn/BBC Micro second processor. (The top 2k of RAM are overlaid at reset ... for attaching to a 5V host bus. (Normally that bus would be the Tube connector on an Acorn micro - it's the 6502 data bus, some control lines, ... |
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Forum: Programmable Logic Topic: A pool of odd ideas for speeding up a 6502 architecture |
| hoglet |
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Posted: Sat Oct 01, 2016 9:09 am
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Replies: 45
Views: 9706
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| ... part of the address which matters.) If you look at the schematic of the Acorn ARM Evaluation system: http://mdfs.net/Info/Comp/BBC/Circuits/Tube/armcpu.gif you can indeed see the SEQ signal from the ARM CPU is combined with several ... |
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Forum: Programmable Logic Topic: FPGA board with 32-bit wide RAM |
| BigEd |
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Posted: Sun Jul 24, 2016 3:07 pm
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Replies: 15
Views: 5118
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| ... as an 8-bit peripheral for a 2MHz bus. Its natural environment is the Tube connector which is standard on Acorn's BBC Micro and Master machines. There are also relatively easy ways to connect to the ... |
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Forum: General Discussions Topic: How can I get my BASIC programs over to my 65c02? |
| BigEd |
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Posted: Tue May 03, 2016 4:03 pm
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Replies: 9
Views: 1601
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| ... a quick and reliable way to move bulk data. There are other ways too: Tube over serial, but that's a bit esoteric for a non-Acorn machine. Also, it's common to make an SDcard interface, for solid state storage. |
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Forum: Programming Topic: Exploring the possibilities ... smart I/O |
| BigEd |
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Posted: Wed Mar 23, 2016 9:19 am
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Replies: 10
Views: 1742
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| ... so across architectures it is indeed only an API. But for Acorn's Beeb-generation 6502 offerings, it's an ABI. It offers access to ... filing systems, either locally or from a second processor connected by Tube.) |
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Forum: Emulation and Simulation Topic: emulator performance on embedded cpu |
| hoglet |
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Posted: Mon Dec 21, 2015 9:02 pm
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Replies: 81
Views: 60359
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| If anyone is interested, I've now got this "Acorn 65tube" derived ARM 65C02 emulation running successfully. In my environment, it's about 70% faster ... |
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Forum: Nostalgia Topic: Acorn's BBC micro - some resources |
| BigEd |
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Posted: Thu Oct 08, 2015 10:11 am
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Replies: 12
Views: 18360
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| Acorn's series of BBC Micro were pretty popular in the UK, and had some presence elsewhere ... printer port - serial port - user port (VIA) - Analogue I/O - 1 MHz bus expansion - Tube interface for second processor (faster 6502, Z80, x86, NS32016, ARM, etc) Optional, but ... |
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