5 meg hard drive controller
dke...@hotmail.com
I'm looking for a list of commands and ports for the TRS-80 5Meg
disk controller. I'm trying to us it in an application that used
a WD1000 compatable controller but the I/O mapping is not the
same.
Can anyone give me a pointer to something on the web or a list
of the I/O addresses and register names.
Thanks
Dwight
Knut Roll-Lund
disassembled and recreated the source for DOSPLUS' 3.50 model III
RIGID/DVR. It's base is 78H
BASE EQU 078H ;HDC BASE ADDRESS
HD_D EQU BASE ;HDC DATA REGISTER
HD_E EQU BASE+1 ;HDC ERROR REGISTER
HD_W EQU BASE+1 ;HDC WRITE PRECOMP
HD_X EQU BASE+2 ;HDC SECTOR COUNT
HD_S EQU BASE+3 ;HDC SECTOR REGISTER
HD_L EQU BASE+4 ;HDC CYLINDER LOW
HD_H EQU BASE+5 ;HDC CYLINDER HIGH
HD_Q EQU BASE+6 ;HDC SIZE/HEAD/DRIVE
HD_C EQU BASE+7 ;HDC COMMAND/STATUS
;
; WD-1000 COMMANDS
;
HREST EQU 00010000B ;RESTORE & INIT
HREAD EQU 00100000B ;READ SECTOR
HWRTE EQU 00110000B ;WRITE SECTOR
HFRMT EQU 01010000B ;FORMAT TRACK
HSEEK EQU 01110000B ;SEEK ADDRESS
For further information I recommend the DOSPLUS manual, the driver
example is at the end of the technical section.
In the example in the model I/III manual the base is 10H
Then there is also model 4 where the example in the manual provides the
base 50H.
But, I do have the RIGID/DVR for DOSPLUS IV too and a quick look agrees
with the model III RIGID/DVR base 78H.
In addition I have an unmarked interface card I'm convinced is the III/4
HD interface, it has 78H as the base address.
BTW:
Disassembling the driver provided two internal functions that were not
documented: REGSAV% and SDIVD% which for model III are 4488H and 4494H
respectively. Searching for similar code in model I DOSPLUS yielded
4525H and 4943H where they are direct calls rather than vectors (no
vectors provided).
model I
REGSAV% EQU 4525H
SDIVD% EQU 4943H
model III
REGSAV% EQU 4485H
SDIVD% EQU 4494H
Knut
dke...@hotmail.com
Thanks for the list.
The schematic in the manual shows an address select jumper
for addresses 4xH, 5xH, 6xHand 7xH. I'm not sure how they
get the 10H??
Dwight
Larry
<dke...@hotmail.com> wrote in message
news:1145645889.3...@g10g2000cwb.googlegroups.com...
The base port address id C0H
Here is some information from the internals page of www.trs-80.com:
This chart provides reference on the Western Digital Hard Disk
Controller board WD1000-TB1, based on the WD1010 controller chip and WD1100
support chip. This board is used in later (white) versions of the Radio
Shack 15 Meg Hard Disk (26-4155).
Earlier versions of the 15M, the 5M, and 12M hard disk systems all use
a larger controller board based on the 8X300 controller chip. I've heard the
R/S 8M hard disk also uses the 8X300 board, but that's unconfirmed.
I have little information on the 8X300 board, but since both 15 and 5
Meg systems are known to work with the same driver/format software from at
least three sources (Tandy/MISOSYS/PowerSOFT), it is assumed most of this
chart also applies to the earlier 8X300 board. (one difference is noted
above)
Although Radio Shack has mapped the HD access ports from C0-CFH as a
standard configuration, both boards can re-map the ports to 50-5FH, 60-6FH,
or 70-7FH simply by changing some jumpers. (If interested, drop a line for
details.)
Special thanks to Adam Rubin, who reviewed the information to help
confirm its accuracy. Comments, corrections and updates are welcome!
Radio Shack 5/15 Meg HD Port Assignments
.--------------------------------------------------------------------------.
|PORT C0H - READ ONLY |PORT C1H - R/W - HD Control Register |
|Bits 2-3 unused |Bits 0-2, 5-7 unused (see note 4) |
| 0-INTRQ-Interrupt request | 3 If set, enables controller |
| 1-HWPL-If set, at least one HD | 4 If set, resets controller |
| is write protected |-------------------------------------|
| 4-WPD4-drive 4 write protected |PORT C2-C3H - READ - HD Dev. ID Reg. |
| 5-WPD3-drive 3 write protected | C4-C7H - HD CTC Channels 0-3 |
| 6-WPD2-drive 2 write protected | See note 1 |
| 7-WPD1-drive 1 write protected |-------------------------------------|
|------------------------------------|PORT C8H - R/W - HD Data Register |
|PORT C9H - READ - Error Register |-------------------------------------|
|Bits 3,5 all reserved (zero) |PORT C9H - WRITE - Wrt Pre-Comp Cyl. |
| 0-DAM not found (see note 2) |The value stored here multiplied x4 |
| 1-Track 0 Error (restore cmnd) |is the RWC start cylinder number. |
| 2-Aborted Command |-------------------------------------|
| 4-ID Not Found Error |PORT CAH - R/W - Sector Count |
| 6-CRC Data Field Error |Used only for multiple sector access |
| 7-Bad Block Detected |don't care w/ single sector commands,|
|------------------------------------|internally decrements when used. |
|PORT CBH - R/W - Sector number |-------------------------------------|
|------------------------------------| PORT CDH - R/W - Cylinder MSB |
|PORT CCH - R/W - Cylinder LSB | (bits 0-1 only; max cyls = 1024) |
|--------------------------------------------------------------------------|
|PORT CEH - R/W - SDH - Sector size/Drive #/Head # |
|Bits 0-2 Head number (0-7) |
| 3-4 Drive number (00-11 reference DSEL1-DSEL4 respectively) |
| 5-6 Sector size (00=256, 01=512, 10=1024, 11=128) |
| 7 EXTension: if set, ECC (Error Checking and Correction) codes |
| are in use, R/W data (sector length+7 bytes) do |
| not check/generate CRC. |
|--------------------------------------------------------------------------|
|PORT CFH - READ - Error Status Register |
|Bit 0 Error (OR of bits 1-7) Bit 4 Seek complete |
| 1 Command in progress 5 Write fault |
| 2 Reserved (0) 6 Drive ready |
| 3 Data request 7 Busy |
|--------------------------------------------------------------------------|
|PORT CFH - WRITE - Command Register Instruction Set - see note 3 |
| Bits: 7 6 5 4 3 2 1 0 | Bits: 7 6 5 4 3 2 1 0 |
| Restore | 0 0 0 1 d c b a | Read Sector | 0 0 1 0 i m 0 0 |
| Seek | 0 1 1 1 d c b a | Write Sector | 0 0 1 1 0 m 0 0 |
| Scan ID | 0 1 0 0 0 0 0 0 | Write Format | 0 1 0 1 0 0 0 0 |
| | |
| "dcba" defines step rate field: | "i" defines interrupt enable status: |
| 0000 = 35 us. | 0 = interrupt when data request |
| 0001-1111 = 0.5-7.5 ms in | line (DRQ*) is enabled |
| 0.5 ms steps | 1 = interrupt at end of command |
| |
| "m" defines multiple sector flag: 0 = one sector, 1 = multiple sectors |
`--------------------------------------------------------------------------'
Notes:
1. Ports C2-C7 are applicable to the Model II configuration with interface
board and 8X300 controller board only. (no further information was
available, sorry!)
2. Port C9, bit 0, READ: R/S 15M HD Service Manual indicates this bit is
reserved (forced zero), but WD1010-00 spec sheet indicates it is used to
indicate a "DAM not found" error.
3. Port CF, WRITE: The 4P ROM is known to send three commands to this port:
16H-restore, 20H-read one sector, 70H-seek. Draw your own conclusions re
the step rate and interrupt values.
4. Although there is no formal documentation of this, according to the
schematics, port C1H bit 2 seems to be used to enable wait state support
on the 8X300 controller board. I cannot absolutely confirm this,
neither
can I say whether the later WD-1000-TB1 board implements this function.
Larry
"Larry" <larry_...@hotmail.com> wrote in message
news:Bwd2g.111395$oL.39607@attbi_s71...
>
> <dke...@hotmail.com> wrote in message
> news:1145645889.3...@g10g2000cwb.googlegroups.com...
>> Hi
>> I'm looking for a list of commands and ports for the TRS-80 5Meg
>> disk controller. I'm trying to us it in an application that used
>> a WD1000 compatable controller but the I/O mapping is not the
>> same.
>> Can anyone give me a pointer to something on the web or a list
>> of the I/O addresses and register names.
>> Thanks
>> Dwight
>
The port address used by DOSPlus was, I think, used by drives they sold
themselves (Aerocomp?).
You can also download the complete service manual from www-trs-80.com
Larry
Knut Roll-Lund
interface', pinning fits the model I expansion port. Its base address is
C8, with 8 registers, no jumpers.
I don't remember where that came from but I was once collecting
information with the intention to make an IDE interface, never did
though. I really like the silence of the old machines, a spinning
harddisk would destroy that.
Knut
Larry
"Knut Roll-Lund" <kr-...@nogarbage.online.no> wrote in message
news:T8idnYEAM_S...@telenor.com...
Knut,
That sounds like the host interface posted on the Dutch TRS-80 site. You
are correct, that interface uses 8 ports starting at C8H. If you look at
the port description I pulled from Ira's site, port C8 is the R/W port for
the Tandy drives.
I actually built one each of those interfaces for my Model I's and Model
4's. They work really well. They do not implement hardware write-protect,
so I had to patch the drivers to not look at port C0H which is where that is
done. Other than that, the CP/M and LDOS drivers work the same on those as
they do on the Tandy 5 MB drives.
Larry
dke...@hotmail.com
I looked at the schematic again and was in error on the decoding.
There are jumpers for 4X, 5X, 7X and CX. The baord I have is
jumpered for CX so I guess C8H is the correct addressing. There
are some functions connected to the lower addressing of C0H and
C1H. These include a controller enable and enabling wait states.
When looking at the schematics, they did not include a lot on
the wait state controls. My guess is that they eliminated these
functions when using the WD1002.
Dwight
Husky
discrete microcontroller implementation of the WD1000 chipset. It
allegedly responds to all of the same commands as the WD1000-TB1 that
were used in Tandy's OSes. I had one, which I sold when I got a 15M.
I never did get one of the Model I adapters though, so I could use it on
the any of the Model I's I had. :-( I might still have that manual
somewhere in my storage boxes.
Husky
Larry
"Husky" <jmg1...@frontiernet.net> wrote in message
news:450B8B4D...@frontiernet.net...
> According to the service manual for the 5M disk, the 8X300 design was a
> discrete microcontroller implementation of the WD1000 chipset. It
> allegedly responds to all of the same commands as the WD1000-TB1 that were
> used in Tandy's OSes. I had one, which I sold when I got a 15M.
> I never did get one of the Model I adapters though, so I could use it on
> the any of the Model I's I had. :-( I might still have that manual
> somewhere in my storage boxes.
>
> Husky
The manual and service manual for the 5M drive is on www.trs-80.com
Larry