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| [44] VIC/C64 IEEE cartridges http://forum.6502.org/viewtopic.php?f=7&t=301 |
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| Author: | RichCini [ Mon Apr 17, 2000 3:26 pm ] |
| Post subject: | [44.1] VIC/C64 IEEE cartridges |
As I was "thumbing" through funet this morning, I came upon the schematics for the IEEE interface modules for the VIC-20 and C64. In case anyone is looking for parts to fix their boards, many manufacturers have EOLed their GPIB interface chips. National discontinued them 6/99 (SN75160/161), and I can't find *any* reference to the MC3446 chips used in the VIC interface on the Motorola Web site. And as we all know, the MOS 6525 TPI can't be found. What I did find, however, is a Web site, http://www.gpib2000.com// These guys make a 40-pin GPIB interface chip which includes all of the line drivers and logic to add a complete IEEE interface to a microcomputer/microcontroller. I will review the data sheets shortly. This raises an interesting question. In the VIC/C64 interfaces, what did the ROM code provide? Was it only protocol code, or was there Commodore-specific driver code in there? Any clues?? Rich |
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| Author: | saipan59 [ Mon Apr 17, 2000 9:10 pm ] |
| Post subject: | [44.2] VIC/C64 IEEE cartridges |
How does the Motorola 68488 fit into the scheme of things? My local surplus dealer has had these in the past, and may still have them. Pete |
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| Author: | RichCini [ Mon Apr 17, 2000 9:27 pm ] |
| Post subject: | [44.3] VIC/C64 IEEE cartridges |
Pete: I don't really know how it fits in. When I searched the Motorols SPS site and ChipCenter.com, it didn't show up as a current product. Rich |
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| Author: | Mike Naberezny [ Tue Apr 18, 2000 12:35 am ] |
| Post subject: | [44.4] VIC/C64 IEEE cartridges |
Rich, I have often thought about adding a Commodore serial bus or IEEE-488 to 6502 projects for access to storage devices. I'd probably prefer the serial bus because the interface requires far fewer I/O lines and devices are much more readily available (1541s). To answer your question, in the case of my VIC-20's IEEE cartridge, there are two 6522s for the interface and a ROM which is simply a KERNAL patch with Commodore's IEEE-488 protocol. |
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| Author: | fachat [ Wed Apr 26, 2000 3:49 pm ] |
| Post subject: | [44.5] VIC/C64 IEEE cartridges |
There are a few IEEE488 interfaces on my homepage, on http://www.6502.org/users/andre/ieee488/index.html They mostly use 6522 and 6521, one a 6525, some 75160/75161 drivers, others simple open collector with resistor arrays (which might be out of specs, but works...) One is even for the PC printer port - I use my PC as harddrive for my C64  Andre |
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| Author: | bill malcolm (nerdman100) [ Wed Nov 29, 2000 3:32 pm ] |
| Post subject: | [44.6] VIC/C64 IEEE cartridges |
yes it is a IEEE all in one chip COOL part. bill |
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