SMC FD37C65B and revision C Errata sheets?
Hi all,
the german Engeneer Tillman Reh has build an Zilog Z280 SBC card with
Eurocard Bus connector:
http://oldcomputers.dyndns.org/public/pub/rechner/zilog/z280/index.html
The Software is open and Tillman allows the PCB to be reproduced from
his original Gerber files on request.
Unfortunately some parts for those cards are almost unobtanium in the
meantime, the Zigzag DRAMs, the COM8117 Uart, the LT1134 Driver chip
and also the SMC FD37C65CLJP FDC are difficult to source.
I have two such cards and I got all the necessary parts, but I have
friends that are also interested in such a card to run CP/M 3 or UZI280
on that Z280 (The Z800!) 16 Bit CPU.
There are many other FDCs that should be compatible, the WD37C65 for
example. This was used in many PC related Floppy controllers..but they
are in fact not compatible. The use of the SMC37C65CLJ P seems to be
necesary for this board, for reasons that are unclear.
While copying data to the disc there happens a timeout on the earlier
FDC varaints, I have read somewhere that reading the status register
gives unexpected results, they have tried to fix this already in the
90ies by inserting some delays, w/o success.
Has someone here Errata Sheets for those SMC FD37C65B (not working) and
FDC37C65C (working) variants of that FDC Chip, so that one can see what
they may have changed between the releases?
Here are some part of the BIOS:
; I/O-Page mu~ bereits auf BOARDP gesetzt sein. Ver{ndert ABHL.
FdcCom::
if loader
ld hl,CList
else
ld hl,(CmdAdr) ; Zeiger auf Befehlsliste
endif
FdcCo1::in a,(FdcSta) ; (Einsprung mit Zeiger in HL)
rla
jr nc,FdcCo1 ; warten bis FDC-RQM (Request for Master)
rla
jr c,FdcErr; bei falscher Datenrichtung: DIO-Error
nop
nop
nop
ld a,(hl)
out (FdcDat),a ; Befehls/Datenbyte an FDC ausgeben
inc hl ; Zeiger auf naechstes Byte
djnzFdcCo1 ; alle Befehlsbytes ausgeben
ret
; DIO-Error (Datenrichtungsfehler im FDC) : Stoppen des Systems
;*** evtl. Fehler korrigieren und weiterarbeiten?
; (Ist Fehler ueberhaupt korrigierbar?)
FdcErr: ld hl,DioMsg
callPMsg; "DIO-Error" ausgeben
di
halt; sicherheitshalber nicht weiter arbeiten
It seems that the FDC Status register requests a data transfer in the
wrong direction on the B-Release Chips... It is this "DIO-Error" that
happens after a few write operations, but formating the disk is possible.
Kind Regards,
Holm
--
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Re: OT: Traveling to Zurich in February
On Fri, 2021-12-17 09:27:26 -0600, Mike Katz via cctalk wrote: > If you are in Zurich you might want to go to Lucerne. It's about 30 minutes > away from Zurich and is a beautiful city. > > Also, if you are in Zurich you might want to go to Confiserie Sprüngli on > Bahnhofstrasse (https://www.spruengli.ch/en/). > It is a well known restaurant in Zurich. But be warned to have a few coins with you. ;-) Bahnhofstraße is _the_ street in Zurich, kind of expensive. Maybe follow it until you reach Lake Zurich and have a walk through the botanical garden (on the right hand side.) MfG, JBG --
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