6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd - test-drb@ccmp.vtda.org

zaft＠azstarnet.com

5 Oct 5 Oct

5:36 a.m.

Check out www.6502.org ! At 04:38 PM 10/5/2001 +0100, you wrote:

Hi, I'm building myself a 6502-based single-board computer, with the aim of running it off a 4.8V NiMH or NiCad battery pack. But I've got a problem. I need a programming language for it. Aparrently there were many BASIC interpreters sold for the Synertek SYM-1 (aka SY-VIM-1), MOS KIM-1 and Rockwell AIM-65. Anyone know what happened to the companies that produced these? Ideally I'd like the source code for a 6502 BASIC interpreter, but binary code would be OK too. The SBC will communicate via a small LCD panel, RS232 (so I can hook it up to a "dumb terminal") and will have a hexadecimal keypad and an optional hard drive, too. Anyone care to make any suggestions (or submit some code)? BTW, I also need some info on the Intel 8271 disk controller - I've got two of these little devils and Intel's datasheet makes absolutely no sense at all. I've also got a Western Digital WD1770-PH 00-02 that I might be able to use instead. First of all, which is the better controller? The 8271 or the 1770? Also, is it possible to overclock a 1770 or an 8271 like you can a 1772? I'd love some schematics and/or some source code. I really don't fancy disassembling Acorn's 8271 DFS and Watford Electronics' 1770 DFS... Thanks. -- Phil. philpem(a)bigfoot.com http://www.philpem.f9.co.uk/

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edick＠idcomm.com

6 Oct 6 Oct

2:10 a.m.

If you use the WD37C65, (available, yet today, via Rochester Electronics) though you do have to use two crystals to cover the range of needed clocks, it is designed to drive the cable directly. Dick ----- Original Message ----- From: "Tony Duell" <ard(a)p850ug1.demon.co.uk> To: <classiccmp(a)classiccmp.org> Sent: Friday, October 05, 2001 6:25 PM Subject: Re: 6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd

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BTW, I also need some info on the Intel 8271 disk controller - I've got two

I would not do a new design using the 8271. The chip is fairly hard to find now, and there are machines that _need_ them (like the old Acorn Systems). In fact, I'd probably use one of the all-in-one PC floppy controller chips unless there was a very good reason not to. Add a crystal and perhaps some cable driver chips. That's all...

of these little devils and Intel's datasheet makes absolutely no sense at all. I've also got a Western Digital WD1770-PH 00-02 that I might be able to use instead. First of all, which is the better controller? The 8271 or the 1770? Also, is it possible to overclock a 1770 or an 8271 like you can a 1772?

Oh, use the 1770. It does double density (MFM) for one thing (the 8271 is single-density only). It also require many fewer support circuits I think. The 1770 and 1772 are closely related (the difference being the step rates the chips can produce). I would guess that the 1770 can be overclocked, but I've never tried it. -tony

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edick＠idcomm.com

9:32 a.m.

The DIL parts are supposed to exist, but I've never seen them. Perhaps the lack of pins for crystal oscillators explains that. Dick ----- Original Message ----- From: "Tony Duell" <ard(a)p850ug1.demon.co.uk> To: <classiccmp(a)classiccmp.org> Sent: Saturday, October 06, 2001 2:14 PM Subject: Re: 6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd

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> > If you use the WD37C65, (available, yet today, via Rochester Electronics)

though

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you do have to use two crystals to cover the range of needed clocks, it is

You only need 1 of the 2 crystals if you want the 300kbps data rate. That's what you get if you read normal 5.25" disks in a HD disk drive (which rotates at 360rpm, not 300 rpm like most other drives). The other crystal (which is always needed) gives you the 250kbps and 500kbps data rates which may be all you need. IIRC the PLCC part has built-in oscillator circuits (just add the crystals) and the DIL part needs TTL-level clocks (there arent' enough pins to have 2 for each crystal on the DIL package), but I might be thinking of some other chip. -tony

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edick＠idcomm.com

2:36 a.m.

I've got 1770's and 1772s, as well as 1771's and 1793/5's yet I'd put the effort into using a WD37C65, since it requires so much less work in the hardware. It has the data/clock separator and write precomp circuitry built-in and is designed to drive the FD cables directly. It's internally a uPD765 and since there's lots of sample code for that, you should have no trouble using it. The only thing you have to do is handle the clock differences for 8", 5-/4", and 3-1/2" drives. IF you leave the 8" drives out of the equation, and I see no reason to include them, it should be dirt-simple. I may be confused about this, but wasn't the 8271 just a rebadged WD1771? If so, I do have some sample code for that in 6502 assembler. Email me off-list and I'll attach it for you. Dick ----- Original Message ----- From: "Philip Pemberton" <philpem(a)bigfoot.com> To: <classiccmp(a)classiccmp.org> Sent: Friday, October 05, 2001 9:38 AM Subject: 6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd

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Hi, I'm building myself a 6502-based single-board computer, with the aim of running it off a 4.8V NiMH or NiCad battery pack. But I've got a problem. I need a programming language for it. Aparrently there were many BASIC interpreters sold for the Synertek SYM-1 (aka SY-VIM-1), MOS KIM-1 and Rockwell AIM-65. Anyone know what happened to the companies that produced these? Ideally I'd like the source code for a 6502 BASIC interpreter, but binary code would be OK too. The SBC will communicate via a small LCD panel, RS232 (so I can hook it up to a "dumb terminal") and will have a hexadecimal keypad and an optional hard drive, too. Anyone care to make any suggestions (or submit some code)? BTW, I also need some info on the Intel 8271 disk controller - I've got two of these little devils and Intel's datasheet makes absolutely no sense at all. I've also got a Western Digital WD1770-PH 00-02 that I might be able to use instead. First of all, which is the better controller? The 8271 or the 1770? Also, is it possible to overclock a 1770 or an 8271 like you can a 1772? I'd love some schematics and/or some source code. I really don't fancy disassembling Acorn's 8271 DFS and Watford Electronics' 1770 DFS... Thanks. -- Phil. philpem(a)bigfoot.com http://www.philpem.f9.co.uk/

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edick＠idcomm.com

9:59 a.m.

I don't remember this clearly at all, but I seem to remember a part from Intel that did have the same pinout as the WD1771. Apparently that wasn't it. Dick ----- Original Message ----- From: "Tony Duell" <ard(a)p850ug1.demon.co.uk> To: <classiccmp(a)classiccmp.org> Sent: Saturday, October 06, 2001 2:18 PM Subject: Re: 6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd

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only thing you have to do is handle the clock differences for 8", 5-/4", and 3-1/2" drives. IF you leave the 8" drives out of the equation, and I see no reason to include them, it should be dirt-simple.

8" drives are no problem. It's the same data rate (and thus clock Xtal) as the HD modes for 5.25" and 3.5" drives. The only time you have to use the second Xtal is if you use a HD 5.25" drive and want to be able to read normal density disks in it. > > I may be confused about this, but wasn't the 8271 just a rebadged WD1771?

If

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They seem to be totally different devices. OK, they're both disk controllers, and they're both single-density only, but there the similarlity ends... -tony

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