PAul, check the Siemens datasheet I previously attached, the -P is upto 16Mhz and the -1-P is upto 20Mhz :-) Regards David Fry On Friday, May 9, 2014 2:10:41 PM UTC+1, pbirkel wrote:
> 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]<javascript:> > > 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]<javascript:> >> > 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] <javascript:>. >>> 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.
