commodorejohn
Veteran Member
I'd be interested in all of those chips.
[edited, I got the count of chips and total $ wrong]
I'll also go for the "4 chips and a board" combo package. So my pre-order is now: 2 x "4 chips and a board" combo
Sounds like a drive-thru fast food order:
"May I take your order?"
"Uhh, I'll have two of the '4 chips and a board' combo, with the pre-flashed roms, to go"
"Your total will be $76 plus shipping. Please drive through."
Yeah, it sounds like a fast food order Perhaps I should start doing kits instead. Like get the PCB alone or get the PCB and all four ICs. But some people have vintage Z80 CPUs and other things in their collections that they want to put in use.
Hmm, due to an impulse purchase on ebay (thye were cheap!), I have 120 Z80 2.5 Mhz CPUs, plastic dip-40, new old stock in tube. I was wondering what to use them all for...
Too bad 2.5Mhz is too slow to handle the floppy drive though. Say, your BOM says 8Mhz is needed for 1.44MB floppy use - how about for a 5.25" 360KB drive?
8" drives used 500Kbit/sec and you used a faster clock fed into the FDC, I think if you did this you could read/write in high density (1.44MB) or maybe 1.76MB like Amiga, but a 4Mhz z80 may not be fast enough on its own, you may need DMA.
I haven't bought anything from mouser before so I have no previous experience with them. The project list stuff is great though. So I made my own variant of the CMOS variant list and tried to order two sets of that (to have some spares, etc.). During that process their web page said that it was well above the price to get free international shipping via fedex or ups, but at checkout there was only the option USPS and paid shipping. So I put it on hold for now (there were anyway a couple of items out of stock, and I had to find a replacement for the reset button which had suddenly changed to 8000 minimum order).Hi,
For builder's convenience I created two project lists on Mouser with almost all components for Zeta:
TTL ICs based: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=e8d3041c19
CMOS ICs based: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=25905e147c
I haven't bought anything from mouser before so I have no previous experience with them. The project list stuff is great though. So I made my own variant of the CMOS variant list and tried to order two sets of that (to have some spares, etc.). During that process their web page said that it was well above the price to get free international shipping via fedex or ups, but at checkout there was only the option USPS and paid shipping. So I put it on hold for now (there were anyway a couple of items out of stock, and I had to find a replacement for the reset button which had suddenly changed to 8000 minimum order).
Anyone else with mouser experience (international shipping?)
-Tor
Hello,
i'm interested for a PCB, did you have one PCB for me?
wich price and shipping costs to Germany?
PayPal?
Other Parts, FDC... and so on, is on stock. ;-)
Many thanks,
Ralf Neumann
Well, I just put in an order for the remaining parts for mine off the Mouser parts list (hooray for tax refunds!) I just had a few miscellaneous questions:
- Any recommendations for a power adapter for this thing? I need something that can safely power the board and two 3.5" floppy drives. (Speaking of floppy drives, are there pre-existing cables that can connect the two-pin power connector on the board to four-pin floppy connectors, or do I have to make my own? If I do, do I wire the two of them in series, or in parallel?)
- It looks from the datasheet for the UART like, combined with the provided oscillator, it can manage up to 115.2 kbaud, but the documentation says the BIOS default is 38.4 kbaud. Can a 20MHz Zeta SBC go up to 115.2? 38.4 should be plenty for my purposes, I'm just curious.
- How does the memory mapping work? It looks to my inexpert eye like it's 32KB paged RAM and 32KB paged ROM (since it's Z80 I'm assuming the ROM goes in 0x0000-7FFF,) but I see there's a ROM disable as well. What goes in its place, if it's disabled?