I was wrong. That's a -1-P which *does* cross-reference for 10 MHz :->.
On Fri, May 9, 2014 at 8:36 AM, Paul Birkel <[email protected]> wrote: > I don't disagree, and I did see that -P part previously. Unfortunately > the cross-reference that I found lists it as an 8MHz part -- which is > consistent with its pricing ... > > > > On Fri, May 9, 2014 at 8:22 AM, David Fry <[email protected]> wrote: > >> Hi Paul, >> >> Yes, I read webpage on the 80286 card some time ago. >> I was just wondering if the 15Mhz 'top out' is more due to reaching the >> upper limit of the 82C284-12 and 82288-10 parts that are shown in the >> pictures of his card, >> John does mention something to the effect of 'your milage may vary', >> Maybe the Siemens parts (as per the datasheet) may be able to get the board >> to 16Mhz with a few wait states to slow the bus access, for me part of the >> fun is seeing what can be achieved. >> >> The other point I was trying to offer is that the SAB82288-I-P chips are >> available on ebay for a fraction of the price of the Intel parts, this may >> be the solution you need regarding your original post. >> >> http://www.ebay.co.uk/itm/SAB82288-I-P-SIEMENS-20-Pin-NEW-SAB82288-1-P-P82288-/120545267057?pt=LH_DefaultDomain_0&hash=item1c110ecd71#ht_198wt_927 >> >> best regards >> >> David Fry >> >> On Friday, May 9, 2014 12:25:16 PM UTC+1, pbirkel wrote: >> >>> Well, note that John states that he wasn't able to achieve stable >>> performance @15MHz ("The board with an AMD 80C286-16 CPU I could get the >>> board to run in my system with a 15MHz Oscillator "most of the time". >>> However I normally run the board with a 12 MHz AMD N80L286-12 (no I/O wait >>> states), with on-board 28C256 EEPROMS or off-board EEPROMS on the MS-DOS >>> support board. At this speed the board is absolutely rock solid.") and the >>> S-100 bus does "top out" around 12 MHz. Adding wait states might get you >>> to 16+ on the CPU. John doesn't mention whether he tried trading >>> wait-states for CPU speed. Experiment! >>> >>> >>> On Fri, May 9, 2014 at 6:43 AM, David Fry <[email protected]> wrote: >>> >>>> John / Paul,, >>>> >>>> have a look at the attached datasheets, looks like Siemens did faster >>>> versions of the 80288 and 80284 support IC's. >>>> Would they work on our 80286 boards at maybe 16Mhz~ 20Mhz with a 20Mhz >>>> CPU? >>>> >>>> regards >>>> >>>> David Fry >>>> >>>> On Saturday, April 26, 2014 6:58:19 PM UTC+1, monahanz wrote: >>>> >>>>> Hi everyone, >>>>> >>>>> >>>>> >>>>> I'm going to quickly do a “Production” run of the V2-80286 >>>>> Master/Slave CPU board. This is a rework and upgrade of the original >>>>> 80286 board. The differences/improvements are listed towards the >>>>> bottom of this page. >>>>> >>>>> >>>>> >>>>> http://s100computers.com/My%20System%20Pages/80286%20Board/ >>>>> 80286%20CPU%20Board.htm#V2-80286 >>>>> >>>>> >>>>> >>>>> This is a fairly complex board and probably not for some to start with >>>>> in the 16 bit S100 arena. However it may be some time until we do >>>>> another run. >>>>> >>>>> >>>>> >>>>> I will be traveling (again) soon, so I would like to get the order out >>>>> early next week. Please let me know if you would like one or more boards >>>>> (via e-mail to monahan AT vitasoft.org). >>>>> >>>>> >>>>> >>>>> Also please it is lightly we will be below the normal number of boards >>>>> (20) to get the low $33 price, could be 2X that. If that is a >>>>> problem let me know. >>>>> >>>>> >>>>> >>>>> John >>>>> >>>> -- >>>> 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.
