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Re: T/A Alphatronic PC? [Re: Spirantho] #75553
12/22/11 02:06 PM
12/22/11 02:06 PM
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USA
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R. Belmont Online content
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Sounds like there's probably a ROM in the disk drive that gets mapped at C000 then.

Re: T/A Alphatronic PC? [Re: R. Belmont] #75554
12/22/11 02:25 PM
12/22/11 02:25 PM
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Aberystwyth, Wales
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Spirantho Offline OP
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Not that I can see. Here's a picture of the inside of the disk drive (I took photos when I took it apart to check the controller chip to work out how to dump it)...


Ian Gledhill
Check out our shop of 8-bit goodness http://www.mutant-caterpillar.co.uk/shop/
Re: T/A Alphatronic PC? [Re: Spirantho] #75569
12/23/11 12:54 AM
12/23/11 12:54 AM
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New Zealand
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mahlemiut Offline
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Now it's actually usable. You can type in and run BASIC programs now. Still a few keys missing, though.



- Barry Rodewald
Re: T/A Alphatronic PC? [Re: Spirantho] #75570
12/23/11 01:34 AM
12/23/11 01:34 AM
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Super cool how fast this shaped up smile

Re: T/A Alphatronic PC? [Re: Spirantho] #75573
12/23/11 06:22 AM
12/23/11 06:22 AM
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Lord Nightmare Offline
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Spirantho: Can you take pictures, high res, of the disk drive board with no flash (use a bright room or a lamp aimed at board to light it)? I can't read the chip labels with the current picture. Also there appear to be a few more chips i can't see on the mainboard, under that brown-phenol modulator? board at the top right.

Also, I have a fluke 9010a z80 probe here and can probably extract the missing ipl rom (which I assume is on part of the 32k HN613256 rom at ic-1058) via that.
But it should also be possible to dump it by removing the z80 from the board and wiring the z80 socket data bus and address lines to that rom dumping apparatus you have on your amiga. Then just dump the address space piecemeal (in 8k chunks or whatever) by tying the z80 socket address lines high and low as appropriate and let the amiga drive the other address lines. Leave vcc unconnected from the amiga to the alphatronic though. (bad stuff like power feedback could happen otherwise)

LN


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Re: T/A Alphatronic PC? [Re: Spirantho] #75574
12/23/11 07:31 AM
12/23/11 07:31 AM
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A question: how fast does the screen update? For us each letter appears one by one. At this stage I assume it all happens at once on the real machine.

Re: T/A Alphatronic PC? [Re: Spirantho] #75576
12/23/11 10:34 AM
12/23/11 10:34 AM
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Robbbert Offline
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Discovered 80-column mode. Type: WIDTH 80

It has a machine-monitor, type: MON
At the prompt press Enter. C to change/examine memory bytes; R to examine registers; E to exit.

It has disk commands, for example type: FILES

Next question. There is a COLOR command, you enter COLOR 1 thru 7. What I need to know, is what colour does each number produce?


Last edited by robbbert; 12/23/11 11:32 AM.
Re: T/A Alphatronic PC? [Re: Spirantho] #75589
12/23/11 02:42 PM
12/23/11 02:42 PM
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Naples, Italy
Kale Offline
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Funnily enough, color 0 doesn't exist in this BASIC.


Re: T/A Alphatronic PC? [Re: Spirantho] #75598
12/23/11 07:29 PM
12/23/11 07:29 PM
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Aberystwyth, Wales
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Spirantho Offline OP
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I'll not be able to check the colours till next week I'm afraid...
The other chips in the disk drive are all just 74LS ones I think - which in particular are you looking for? I don't want to take it apart if I can help it as it was a nightmare getting it back together last time!
As for dumping the spare (unused probably) 8K, I'd guess I can desolder it and dump it as if it were a 27128, tieing the high address line to Vcc...?
Fantastic work on the emulation!


Ian Gledhill
Check out our shop of 8-bit goodness http://www.mutant-caterpillar.co.uk/shop/
Re: T/A Alphatronic PC? [Re: Spirantho] #75613
12/24/11 11:16 AM
12/24/11 11:16 AM
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New Zealand
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mahlemiut Offline
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I've hooked up the 8251 USART and cassette, but the MAME i8251 core is missing implementation of receive/transmit data callbacks, so while the CSAVE command will work, it won't actually save anything to a cassette image, as nothing is yet fed to the cassette I/O.


- Barry Rodewald
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