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M1BYT > TECH 08.01.09 22:43l 40 Lines 1717 Bytes #999 (0) @ WW
BID : EE4446M1BYT
Read: GUEST DK4IR DO4JTR OE7FMI
Subj: Re: Micro Computer MK14
Path: DB0FHN<DB0RGB<OE5XBL<OE6XPE<DB0RES<DK0WUE<7M3TJZ<ZL2BAU<GB7ESX<GB7FCR
Sent: 090108/2012Z @:GB7FCR.#16.GBR.EU #:22814 [Blackpool] FBB-7.03a $:EE4446M1
From: M1BYT@GB7FCR.#16.GBR.EU
To : TECH@WW
G7OSK Opined with considerable skill:-
> I have had this Micro Computer for over 25 years.
You don't beleive in rushing then :-)
> This was made and not working when I was given this. I have now found the
> main fault. No connection from one side of the PCB to the other at most
> of the IC pin holes.
The very early ones had serious problems with quality control, one of the
problems was poor or none existant through hole plating.
> I am thinking of using an eprom in place of the 2 ROMs. I have the Monitor
> Listing (OS) in the manual but when I check the good ROM with the lists
> this do not match after HEX105, OK up to that.
There were various updates in the ROM software, which might explain the
differences between the undamaged ROM and the HEX listing. The only way
forward is to program an EPROM as per the listing, then try it with the ROM.
If that fails program all exactly as per listing and test again.
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
ºInternational Museums Weekends 14th+15th & 21st+22ndº
º June 2008 www.ukradioamateur.co.uk/imw/index.html º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º The ARC's FL/RAE courses + Newcomers Introduction º
º to amateur radio:- http://www.ukradioamateur.co.uk/ º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍËÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º QTH: Garforth, W. Yorks.. º Timed 19:10 º
º harry.m1byt@tiscali.co.uk º 08 Jan 09 º
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÊÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
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