I'd prefer to order this board as it is (or with minor changes like #1) and then design a "new" board for option #3.
Todd * John Monahan <[email protected]> [140602 12:05]: > OK, OK there seems to be grown swell for a V2 of this board. We have three > choices:- > > We can tweak the layout, correcting little things like when the LED come on > and what they represent – currently not really useful. > > Also allow the board to function as a “slave of a slave” with the Z80 a > master and a 80286 (or 80386) as a slave and a few other minor things. > > > > We could probably squeeze in a more extensive master slave chip arrangement > (it will be tight) like the 80286 such that the board itself as a slave could > call another sub-slave (or DMA controller). > > > > Or we could redo the complete board and move it up to a 68020. The 68020 had > one neat feature, you could dynamically choose the bus size you want—8, 16, > or 32 bits with two external pins on the chip. This for example allowed you > to use a single boot ROM instead or 2 (or 4) as was the case in the with 16 > bit wide systems. They also picked up on the Intel idea bus buffering by > using an efficient "cache". The cache in the 68020 was only 256 bytes deep > and works a little differently from the 8086 queue. If a jump occurs to a > point in the queue, the queue was flushed and reloaded. But the cache looks > just like memory, so a jump to a point in the cache would not cause the cache > to be dumped and reloaded. If loops are small enough, they can execute > directly from the cache. > > > > The second two upgrades would definitely require one (or more prototypes), > and realistically would not get out until Autumn for #3, probably August for > #2. > > > > What do you guys think. > > > > John > > > > > > From: [email protected] [mailto:[email protected]] On > Behalf Of Edward Snider > Sent: Monday, June 2, 2014 7:27 AM > To: [email protected] > Subject: Re: [N8VEM-S100:3893] Re: Possible run of S100 V3 68000/68010 CPU > boards > > > > Sure Ian, you are down for 2 boards. > > > > We have enough interest that there will definitely be a run once the updates > are made to the board. > > > > Update on who wants boards... > > > > 1. Fabio Battaglia - 3 > > 2. Paul Birkel - 1 > > 3. Todd Goodman - 3 > > 4. Brian Marstella - 1 > > 5. Jerry Brumble - 2 > > 6. Gary Kaufman - 2 > > 7. Andrew Bingham - 1 > > 8. Matt Turner - 2 > > 9. Yoda - 1 > > 10. Andrew Kwan - 1 > > 11. Ian May - 2 > > > > > > Total: 19 > > > > > > > > > On Monday, June 2, 2014 8:40:52 AM UTC-5, Ian May wrote: > > Hi Ed, > > Could you put me on the list for 2 of the updated 68000 boards please? > > Cheers, > > Ian. > > > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
