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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Fri Sep 06, 2019 8:16 pm
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Replies: 23
Views: 14141
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Ed,
Thanks for the heads-up. Camberley is not too far from me for at least a day trip. |
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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Fri Sep 06, 2019 1:54 pm
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Replies: 23
Views: 14141
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| As an update to the bitslice design. The Postman arrived this morning with a highly prized package of 74F219 16x4 RAMs. I got these from LittleDiode - a supplier in South London who keep a lot of rare stuff. https://www.littlediode.com/components/home.php They are date-stamped 8818, and I am hoping ... |
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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Wed Sep 04, 2019 8:27 am
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Replies: 23
Views: 14141
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| Hi Ed, Thanks for your interest. Having been inspired by the Gigatron, and it's approach to getting the most from a minimum architecture, I'm ready to take on a new challenge. I've been following the thread over on the 6502.org forum, regarding a faster implementation of the 6502 in TTL - which has ... |
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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Tue Sep 03, 2019 10:33 pm
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Replies: 23
Views: 14141
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Thanks for your interest Joan.
I just wish for a simple 16 bit architecture, which we can all discuss here.
Best
Ken |
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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Tue Sep 03, 2019 4:59 pm
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Replies: 23
Views: 14141
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| As an update to the proposed 4-bit bitslice design. I found some 74F219 (16 x 4 bit RAMs), so I guess that's my register file sorted I also revisited Wozniak's Sweet 16, and pondered whether this might make a suitable machine ISA to implement in TTL. It simplifies the instruction set - as all regist... |
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Forum: Projects Topic: Possibly the most short lived diy processor. |
| monsonite |
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Posted: Thu Aug 29, 2019 9:48 pm
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Replies: 4
Views: 3553
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| Thanks for sharing the details of this fascinating university spring term project. Somehow I guess I just took all the wrong courses, in the wrong country, at the wrong time. Nevermind - I'm taking a sabbatical year - starting in 2 weeks, and hope to spend time filling in the gaps of my education. B... |
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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Fri Aug 23, 2019 8:15 pm
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Replies: 23
Views: 14141
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| B. I realise that there are still some places where you can find the '181 (and even the '172) but for a viable project, I'd really be looking for major sources with 100+ pricing. I like the idea of a bitslice, and having prototyped a 4 bit version on a breadboard, the move to a low cost pcb, is less... |
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Forum: CPU/MCU choices and designs Topic: Bitslice using currently available TTL |
| monsonite |
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Posted: Fri Aug 23, 2019 5:43 pm
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Replies: 23
Views: 14141
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| Hi All, As technology moves on, many of the devices available to TTL designers have long since been obsoleted. I recently looked at Brad Rodriguez's PISC cpu of 1994 and lamented that two of the key parts were no longer available. https://bradrodriguez.com/papers/piscedu2.htm The 74xx181 ALU and the... |
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Forum: Projects Topic: Kobold - an innovative 16 bit TTL Retrocomputer |
| monsonite |
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Posted: Fri Aug 23, 2019 5:10 pm
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Replies: 40
Views: 14462
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| Hi All, Over on hackaday.io Roelh has been busy with his latest TTL project https://hackaday.io/project/164897-kobold-retro-ttl-computer It's a 16-bit machine, entirely in 74xx TTL, with a 20 bit address space. The instruction set is inspired by PDP-11 and 68000. The cpu is 5.4" x 4" and c... |
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Forum: General Discussions Topic: Teensy 4.0 - 600MHz ARM Cortex M7 dev-board |
| monsonite |
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Posted: Fri Aug 16, 2019 4:59 pm
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Replies: 2
Views: 3276
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| Hi All, It's never been easier to get hold of a fast microcontroller in a breadboard friendly package. The Teensy 4.0 was announced about a week ago and comes in a 24 pin DIP module. It's based on the NXP 600MHz Cortex M7 and sells for $19.95. With 2MB of flash and 1MB of RAM it's a useful board for... |
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Forum: General Discussions Topic: It's not getting any easier |
| monsonite |
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Posted: Sun Jul 14, 2019 11:20 am
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Replies: 14
Views: 10123
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| Hi All, This weekend I decided to port Mike Chamber's 6502 emulator code, complete with EhBASIC ROM image to run on the Nucleo 743H dev board. The task was simple and straightforward, with the code running first time. A couple of tweaks to the RAMSIZE and the serial baudrate, and we now have an ARM ... |
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Forum: Simulation and emulation Topic: Emulating the 6502 on a Nucleo board |
| monsonite |
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Posted: Sat Jul 13, 2019 1:50 pm
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Replies: 0
Views: 10514
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| Hi All, I've already mentioned this on the 6502.org forum, but I thought it might be worth posting here too. Around 2011, Mike Chambers developed a 6502 emulator, written in C, that has been ported to a wide range of processors. I came across it a few years ago, when it was being offered as a means ... |
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Forum: Hardware in general Topic: Gigatron - A TTL machine with integrated VGA |
| monsonite |
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Posted: Sat Jun 15, 2019 11:34 am
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Replies: 25
Views: 21011
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| As an update to the Gigatron TTL Computer Project, late last night, Marcel the project founder announced the development of a 6502 emulator, "v6502" residing in ROM. It's not going to be fast - probably about 1/10th the throughput of a 1MHz 6502, but it can interoperate with the existing v... |
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Forum: Hardware in general Topic: The LD12 - a TTL PDP-8 kit from 1974 |
| monsonite |
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Posted: Fri May 31, 2019 5:52 pm
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Replies: 7
Views: 17965
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| Perhaps it should be remembered that by 1974, the PDP-8 already had 12 years of history, beginning with the LINC and the PDP-5 from 1962/63 which originally defined the architecture and instruction set - based on the early DEC logic modules. The PDP-8 followed on from the PDP-5 in 1965 with improved... |
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Forum: Implementation and Construction Topic: IC Clamps for Logic Analyzers? |
| monsonite |
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Posted: Thu May 30, 2019 1:41 pm
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Replies: 3
Views: 2806
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| I found that a lot of the useful things like cables, IC adaptors, test clips and pogo pins are still good value when bought from Chinese suppliers. They use this stuff in their factories, and so their local suppliers produce economical parts. You might wish to have a look on Alibaba or AliExpress or... |
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